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Lilium lancifolium

Lilium lancifolium Thunb., commonly known as the tiger lily, is a bulbous herbaceous perennial belonging to the genus Lilium in the Liliaceae family.^[1] Native to East Asia, including regions of China, Japan, Korea, and the Russian Far East,^[2] it features erect stems growing 0.6–1.5 m tall from a scaly subterranean bulb.^[3] The leaves are alternate, lanceolate, and measure 100–180 mm in length, often producing small bulbils in the upper leaf axils that enable vegetative reproduction.^[1] In late summer, typically July to August, it produces racemes of 3–25 nodding flowers, each with six reflexed tepals 70–100 mm long that are bright orange and profusely spotted with purple-black.^[1]^[4] Widely cultivated as an ornamental plant for its striking blooms, L. lancifolium has naturalized extensively outside its native range, particularly in eastern and northeastern North America, where it occurs in disturbed habitats such as meadows, fields, roadsides, and lawn edges.^[1]^[5] It thrives in full sun to partial shade and well-drained, humus-rich soils, with stems often hairy and capable of reaching up to 1.2–1.5 m in height under optimal conditions.^[3]^[6] The species reproduces both sexually via capsules containing numerous seeds and asexually through bulbils and offsets from the parent bulb, contributing to its weedy potential in introduced areas.^[1] Flowers are primarily pollinated by bees, and the large bulbs are edible, historically used in Asian cuisine and traditional medicine.^[6]^[1] Synonyms for L. lancifolium include L. tigrinum DC., reflecting its historical classification, and it is classified within the order Liliales as a monocotyledonous forb/herb.^[5] While not native to North America, it is sporadically encountered as a garden escape and is valued in horticulture for its vigorous growth and colorful displays, though it can host plant viruses like Plantago asiatica mosaic virus.^[7] In its native range, it inhabits similar open, disturbed sites, underscoring its adaptability.^[1]

Taxonomy and nomenclature

Scientific classification

Lilium lancifolium belongs to the genus Lilium within the family Liliaceae, and is classified in the Asiatic lily group based on its morphological characteristics and phylogenetic placement.^[3]^[2] The accepted scientific name is Lilium lancifolium Thunb., published in 1794.^[2] Its primary synonym is Lilium tigrinum Ker Gawl., described in 1809.^[8] The name Lilium lancifolium is preferred under the International Code of Nomenclature for algae, fungi, and plants due to the principle of priority, as Thunberg's publication predates Ker Gawl.'s by 15 years, and the type specimen aligns with the species concept.^[8] Historically, the species was widely known as Lilium tigrinum throughout much of modern botany, leading to its common name "tiger lily," but nomenclatural reassessments in the late 20th and early 21st centuries, including lectotypification of Thunberg's name, confirmed Lilium lancifolium as the correct basionym. This nomenclature is accepted in major references including POWO (as of 2025) and Flora of North America.^[8]^[2] This change resolved ambiguities from earlier descriptions, where Lilium tigrinum was applied to cultivated plants exhibiting key traits like axillary bulbils, distinguishing the species from morphologically similar lilies such as Lilium superbum. Two varieties are recognized: L. lancifolium var. lancifolium, the typical form, and var. splendens (Van Houtte) V.A. Matthews, which is distinguished by more intense spotting on the flowers.^[9]^[10]

Names and etymology

The specific epithet lancifolium derives from the Latin words lancea (lance) and folium (leaf), alluding to the plant's lanceolate leaves.^[3] Lilium lancifolium was first described by Swedish botanist Carl Peter Thunberg in 1794, based on specimens collected during his travels in Japan, and published in the Transactions of the Linnean Society of London. In 1809, British botanist John Bellenden Ker Gawler described the species as Lilium tigrinum from cultivated material, a name that became widely accepted for over two centuries due to its evocative reference to the flower's spotted appearance. Recent nomenclatural review, prioritizing Thunberg's earlier publication, has reinstated L. lancifolium as the correct name, rendering L. tigrinum an outdated synonym.^[11] In English, the plant is commonly called the tiger lily, a name inspired by the dark spots on its vivid orange flowers that evoke tiger markings. Japanese vernacular names include oniyuri (鬼百合), translating to "ogre lily" or "devil lily," reflecting its bold, striking form. In Korea, it is known as chamnari (참나리). In China, the bulbs are referred to as baihe (百合), meaning "hundred unions" or simply "lily." Russian speakers call it liliya lancetolistnaya (лилия lancетолистная), directly translating to "lance-leaved lily" in line with the scientific epithet.^[3]^[12]^[6] In horticultural trade, the species has been popularized under names like "Fortune's tiger lily," referring to the variety L. lancifolium var. fortunei, named after Scottish plant hunter Robert Fortune.^[9]^[13]

Morphology

Vegetative characteristics

Lilium lancifolium is a perennial herbaceous bulbous plant that produces a single erect, unbranched stem from each bulb, reaching heights of 75–200 cm.^[14]^[8] The stems are terete, light green to purplish, and range from glabrous to moderately covered in white woolly hairs.^[14]^[8] Stem roots are typically present along the lower portions.^[8] The underground bulb is widely ovoid to globoid, measuring 3.5–8 cm in diameter, and consists of broad, unsegmented white scales up to 3–4 cm long that are derived from modified leaf bases.^[8]^[14] Fibrous adventitious roots arise from the base of the bulb.^[14] The leaves are simple, lanceolate to narrowly lanceolate, with parallel venation and smooth margins; they measure 10–18 cm long and 1–1.5 cm wide, arranged alternately or scattered along the stem, often horizontal with drooping tips.^[1]^[8]^[14] Upper leaves may bear small axillary bulbils, which are ovoid and dark purple.^[8]^[14] The growth cycle begins with emergence from the bulb in spring, followed by vegetative development through summer, and senescence in autumn as the aerial parts die back, leaving the bulb dormant over winter.^[1]^[15]

Reproductive structures

The inflorescence of Lilium lancifolium is a terminal raceme bearing 3–6(–25) flowers.^[8] The pedicels are stout, 5–10 cm long, and may occasionally be dichotomous.^[8] The flowers are pendulous and funnel-shaped, or more precisely Turk's-cap-shaped, with a diameter of 10–12 cm.^[15] They consist of six tepals that are orange-red, strongly reflexed for about one-fifth to one-quarter of their length from the base, and marked with numerous black-purple spots concentrated near the base.^[8] The flowers are odorless.^[8] The six stamens feature purple anthers approximately 2 cm long, with rust-colored pollen, while the style is green and the stigma is three-lobed.^[8] Nectar is produced in specialized nectaries located at the bases of the tepals, serving to attract insect pollinators such as butterflies and bees.^[14]^[16] The fruits are erect, three-valved capsules, 3–4 cm long and cylindric to broadly club-shaped.^[8]^[15] Each capsule contains numerous black seeds that are winged, facilitating wind dispersal.^[17]^[18] In its native range across East Asia, L. lancifolium typically flowers from July to August.^[15]

Reproduction and life cycle

L. lancifolium exists as a polyploid complex with diploid (2n=24) and triploid (2n=36) cytotypes; reproduction varies accordingly, with triploids being sterile and dependent on vegetative means.^[19]^[20]

Sexual reproduction

Sexual reproduction occurs primarily in diploid cytotypes; triploid forms, common in cultivation and naturalized populations, are sterile and do not produce viable seeds.^[14]^[21] In fertile individuals, hermaphroditic flowers are primarily pollinated by butterflies, which are drawn to the nectar produced by nectaries located at the base of the tepals.^[14] Butterflies facilitate cross-pollination by transferring pollen between flowers while feeding on nectar, whereas small bees often collect pollen without effectively pollinating.^[14] Fertile diploids are self-incompatible, requiring pollen from genetically distinct individuals for successful reproduction, which prevents inbreeding and promotes outcrossing.^[21]^[22] Upon compatible pollination, pollen grains germinate on the stigma, producing tubes that grow through the style to reach the ovules in the ovary. Double fertilization, characteristic of the Liliaceae family, then occurs: one sperm nucleus fuses with the egg cell to form the zygote, while the second fuses with the central cell to develop the endosperm, supporting embryo growth.^[23] This process triggers the ovary to mature into a dehiscent, three-valved capsule containing numerous thin seeds.^[15] Post-fertilization, the ovules develop into viable seeds, with the plant's reproductive structures—such as the elongated style—facilitating efficient pollen tube guidance as described in its floral morphology. The seeds of L. lancifolium are disc-shaped with a membranous wing, enabling wind dispersal (anemochory) from the upright capsules after dehiscence.^[24] Seed viability typically lasts 2–3 years under proper storage conditions, allowing for delayed germination.^[25] Fresh seeds germinate relatively quickly, forming small bulbs within 10–17 days under suitable moist, cool conditions, though plants require 3–5 years to reach full maturity and flower.^[25]^[26] This sexual pathway integrates into the life cycle by generating genetically diverse offspring through outcrossing, enhancing population variation in contrast to the uniform clones produced vegetatively.^[27]^[28]

Vegetative propagation

_Lilium lancifolium primarily reproduces asexually through the formation of bulbils, which are small, clonal propagules that develop in the axils of leaves on the upper portion of the stem. These bulbils appear as small white dots approximately 20 days after planting and mature into black, spherical structures about 0.5–1 cm in diameter by late summer or early autumn.^[29] Formation occurs through the differentiation of axillary meristems, regulated by hormones such as auxin, jasmonic acid, and cytokinins, which mediate sucrose metabolism and promote bulbil initiation from transparent bulges to fully developed organs.^[29]^[30] In the natural propagation process, mature bulbils detach from the parent plant and fall to the soil surface, where they readily root and sprout in autumn, developing into new plantlets genetically identical to the parent due to mitotic division.^[30]^[31] This clonal reproduction ensures 100% genetic uniformity, allowing the production of numerous identical offspring without reliance on sexual reproduction.^[32] Additionally, vegetative propagation occurs via bulb division, where the parent bulb produces offsets annually that can be separated to form new plants, further contributing to clonal expansion.^[33] The advantages of this vegetative strategy include rapid spread through prolific bulbil production—even young plants can generate one or two bulbils—enabling quick population growth and enhanced survival in disturbed habitats by minimizing genetic variation.^[33]^[31] In the life cycle of the triploid cytotype of L. lancifolium, bulbils and offsets play a crucial role in persistence, allowing the plant to propagate effectively without seed production and supporting long-term colony establishment.^[30]

Biogeography

Native range and habitat

Lilium lancifolium is native to eastern Asia, encompassing the Russian Far East (including Primorye, Sakhalin, and the Kuril Islands), Japan, Korea, and various regions of China such as North-Central, South-Central, and Southeast China, along with Manchuria, Qinghai, and Tibet.^[2] This distribution reflects its adaptation to diverse temperate landscapes across these areas, where it occurs as a bulbous geophyte in stable, natural populations.^[2] Within its native range, L. lancifolium thrives in moist meadows, forest edges, riverbanks, grassy slopes, and hillsides, often along streams and at forest margins. It is typically found at elevations from 0 to 1,000 meters, favoring well-drained loamy soils that are slightly acidic and enriched with organic matter.^[8] The species tolerates full sun to partial shade, commonly associating with deciduous forest understories where its tall stems enable effective light competition.^[3] The plant occupies the temperate biome, experiencing cold winters and moderate to high annual precipitation suitable for its moist habitat preferences.^[2] These conditions align with USDA hardiness zones 3-9, supporting its perennial growth cycle in regions with distinct seasonal changes.^[3]

Introduced ranges and invasiveness

Lilium lancifolium has become widely naturalized beyond its native East Asian range, primarily through escape from ornamental gardens. It was introduced to Europe as early as 1684 by the Dutch East India Company and has since established populations in countries such as the United Kingdom and France, where it persists in disturbed habitats like roadsides and woodland edges.^[34] In North America, introductions occurred in the mid-19th century, leading to naturalization across much of the eastern United States, including New England regions like Massachusetts and New Hampshire, the Mid-Atlantic states, the Pacific Northwest, and scattered southern areas such as Georgia.^[3] The species also naturalized in New Zealand starting in the 1950s, where it now occurs in waste places and along roadsides.^[35] These expansions stem from its historical use in horticulture, with plants readily escaping cultivation due to prolific vegetative reproduction via aerial bulbils.^[36] The plant exhibits invasive behavior in several introduced regions, forming dense monocultures that outcompete native flora. Its bulbils facilitate rapid colonization, enabling establishment in wetlands, meadows, and open disturbed sites, where it displaces indigenous species.^[37] In the United States, L. lancifolium is considered invasive or weedy in parts of New England, with documented rapid spread following mid-19th century introductions from Asian stock.^[37] Similarly, in New Zealand, it is recognized as an environmental weed at the national level, contributing to altered plant communities in non-native ecosystems.^[38] Ecological impacts include reduced biodiversity through resource competition and habitat alteration, as the species' vigorous growth shades out understory plants and monopolizes soil nutrients and moisture.^[39] Underground bulbs persist for years, rendering complete eradication difficult and allowing reinvasion even after surface removal.^[40] Management strategies emphasize prevention and targeted control, such as manual excavation of bulbs and bulbils to limit spread, combined with selective herbicide applications in infested areas.^[37] Gardeners are advised to opt for non-invasive lily alternatives to curb further introductions. As of 2025, regional invasive species councils in North America and New Zealand maintain ongoing monitoring programs, though L. lancifolium lacks a global IUCN invasive designation and is primarily addressed at local scales.^[39]

Human interactions

Cultivation and uses

Lilium lancifolium has been a popular ornamental garden plant in Europe and North America since the early 19th century, following its introduction from East Asia. It thrives in USDA hardiness zones 3 to 9, preferring full sun to partial shade and well-drained, humus-rich soil with a neutral to slightly acidic pH. Bulbs should be planted in autumn or early spring, at a depth of 15 cm (6 inches) and spaced 20-30 cm apart, to allow for stem rooting and naturalization.^[41]^[42]^[43] Notable cultivars include 'Flore Pleno', which features fully double, orange-red flowers with purple spots, and 'Splendens', known for its vigorous growth and clusters of up to 25 nodding, black-spotted orange flowers; the latter received the Royal Horticultural Society's Award of Garden Merit in 1993. These varieties are valued for their showy summer blooms, which attract butterflies and serve as cut flowers, though the plants are not fragrant. In garden design, L. lancifolium adds vertical interest, reaching 1-2 meters tall, and is suitable for borders, woodland edges, or Asian-themed landscapes.^[44]^[45]^[3] The bulbs of L. lancifolium are edible and have been cultivated and foraged in East Asia for centuries, prized for their starchy, mild flavor reminiscent of potatoes or turnips. In Chinese cuisine, they are often stir-fried, added to soups, or used dried in rice dishes, while in Korean and Japanese traditions, they feature in stews and porridges. Historical records indicate use since ancient times, with ongoing commercial cultivation in China for food purposes. Flowers and buds can also be eaten raw or cooked in salads.^[46]^[47] Traditionally, L. lancifolium has been used in East Asian medicine, particularly in Traditional Chinese Medicine, where bulb preparations nourish yin, moisten the lungs, clear the heart, and alleviate coughs, irritability, and insomnia. Poultices from the bulbs have been applied to treat burns and fevers, and decoctions for sore throats and palpitations. Modern scientific evidence for these uses remains limited, with studies focusing more on antioxidant and anti-inflammatory properties rather than clinical efficacy.^[21]^[48]^[49] In cultivation, propagation occurs easily through bulb division in autumn or by planting bulbils from leaf axils, which root readily and flower within two years. The species readily hybridizes with other Lilium taxa, contributing to Asiatic lily breeding programs for enhanced disease resistance and vigor. To manage common issues like botrytis blight, ensure good air circulation, avoid overhead watering, and apply fungicides preventively in humid conditions; L. lancifolium shows moderate tolerance compared to more susceptible hybrids.^[50]^[51]^[52]

Toxicity

Lilium lancifolium, commonly known as the tiger lily, contains an unidentified toxic compound present in all parts of the plant, including leaves, stems, flowers, pollen, and even vase water from cut flowers, which can cause acute kidney failure in cats upon ingestion of even small amounts.^[53] In cats, initial symptoms such as vomiting, lethargy, and anorexia typically appear within 12-24 hours of exposure, progressing to renal failure within 24-72 hours if untreated.^[54]^[55] Without prompt intervention, mortality rates can reach 50-100%, making it one of the most lethal plant toxicities for felines.^[56]^[55] A 2007 veterinary case report documented successful resolution of acute kidney injury in a male cat after ingestion of Lilium lancifolium, achieved through aggressive therapy including intravenous fluids, activated charcoal administration, and supportive care, highlighting the potential for recovery with early intervention.^[57] All species in the Lilium genus are toxic to cats, but L. lancifolium poses a particular risk due to its prevalence in ornamental gardens and as a common houseplant.^[58]^[53] In other animals, the effects are generally milder; dogs may experience gastrointestinal upset such as vomiting and diarrhea from ingestion, but rarely develop kidney issues.^[59] Livestock, including cattle, can suffer renal tubular necrosis from consuming flowers or other parts in sufficient quantities, though such cases are uncommon.^[60] For humans, L. lancifolium is generally safe when bulbs are cooked and consumed as in traditional Asian cuisine, but raw bulbs may cause nausea, vomiting, or diarrhea due to irritant compounds; no major poisoning incidents have been widely reported.^[61]^[62] Management of exposure involves immediate veterinary attention for affected pets, including decontamination and renal support, while prevention strategies include keeping plants out of reach in pet-safe gardens.^[54]^[58]

References

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Lilium lancifolium (lance-leaved tiger lily) - Go Botany
Lilium lancifolium, native to China, has alternate, lance-shaped leaves with bulbils, and is found in fields, roadsides, and lawn edges. It has a raceme ...
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Lilium lancifolium Thunb. ; Class Equisetopsida ; Subclass Magnoliidae ; Order. Liliales ; Family. Liliaceae ; Genus. Lilium.
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털중나리(Lilium lancifolium var. flaviflorum) This striking flower is Lilium lancifolium var. flaviflorum, known in Korea as Teoljungnari, a wild variant of ...
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(Prosartes) persistent, winged in some species of Calochortus and Lilium, rarely beakedbeak: ... Vegetative bulblets: Lilium lancifolium; Photo by J. Hernandez, ...<|control11|><|separator|>
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Prevalence of acute kidney injury and outcome in cats treated as ...
Oct 16, 2024 · In cats where treatment is delayed, mortality rates as high as 50% to 100% have been reported. Unfortunately, there is little known about the ...
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Resolution of acute kidney injury in a cat after lily (Lilium lancifolium ...
Cat Diseases / chemically induced*; Cats; Lilium / toxicity*; Male; Plant Poisoning / veterinary*; Treatment Outcome; Uremia / chemically induced; Uremia / ...
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Lovely Lilies and Curious Cats: A Dangerous Combination - FDA
Sep 16, 2021 · The Peruvian lily contains a toxin that causes mild stomach upset (vomiting and diarrhea) if a cat or dog ingests a large amount. The signs ...
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Are Lilies Poisonous to Dogs? - PetMD
Jun 17, 2019 · The bulbs of these lilies are the most poisonous part of the plant and can cause mild to severe gastrointestinal (GI) upset in dogs.
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Lily, Easter lily, Asiatic lily, tiger lily - Guide to Poisonous Plants
Botanical Name: Lilium L. Description The genus Lilium has approximately 100 species that are indigenous to Europe and Asia and North America. All species grow ...Missing: lancifolium | Show results with:lancifolium
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Growing Lilies in Iowa - Yard and Garden
While some species are edible for humans, almost all lilies are considered toxic to cats, especially the Easter lily (Lilium longiflorum). Other species closely ...Missing: livestock | Show results with:livestock
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Is Tiger lily Poisonous - Toxic - PictureThis
Sep 11, 2024 · Eating this plant is known to cause nausea, vomiting, and diarrhea in humans. These problems get worse the smaller the human is and the larger the amount that ...