Tricyrtis is a genus of Asian flowering plants in the lily family, with approximately 20 known species. The species are commonly known in English as Toad lilies. It has a native range from the Himalayas to eastern Asia, including China, Japan, Philippines and Taiwan, and a few species are cultivated for their ornamental qualities in other parts of the world.
Tricyrtis are herbaceous perennials with creeping rhizomes. The stems are typically erect or maybe ascending, and sometimes branched from the middle to the top. The subsessile leaves are arranged alternately along the stems. The inflorescences are most commonly thyrse or thyrsoid, or rarely the flowers are arranged into a raceme. The showy, solitary flowers are bisexual. Perianth campanulate or trumpet-shaped with six free tepals arranged into two whorls: the outer whorl has nectar secreting pouches, while the inner whorl has upright tepals with dorsal crests. The tepals are white or yellow with purplish spots, usually recurved or reflexed. The six stamens are inserted at base of the tepals, and the filaments are slightly flattened, forming a short tube. The anthers are dorsifixed. The three-loculed ovary have many ovules per locule. The styles are arranged into a column. The three-angled fruits are broadly cylindrical capsules and when ripe release many small, flat, ovate to orbicular shaped seeds.
- Tricyrtis affinis Makino - Japan
- Tricyrtis chinensis Hiroshi Takahashi - China
- Tricyrtis dilatata Nakai - South Korea
- Tricyrtis flava Maxim - Kyushu Island in Japan
- Tricyrtis formosana Baker - Taiwan, Nansei-shoto (Ryukyu Islands)
- Tricyrtis hirta (Thunb.) Hook. - Japan
- Tricyrtis imeldae Guthnick - Mindanao Island in Philippines
- Tricyrtis ishiiana (Kitag. & T.Koyama) Ohwi & Okuyama - Honshu Island in Japan
- Tricyrtis lasiocarpa Matsum. - Taiwan
- Tricyrtis latifolia Maxim. - Japan
- Tricyrtis macrantha Maxim. - Shikoku Island in Japan
- Tricyrtis macranthopsis Masam. - Kii Peninsula in Japan
- Tricyrtis macropoda Miq. - Japan
- Tricyrtis maculata (D.Don) J.F.Macbr. - Nepal, Sikkim, Bhutan, Assam, Myanmar, China
- Tricyrtis nana Yatabe - Japan
- Tricyrtis ohsumiensis  - Kyushu Island in Japan
- Tricyrtis perfoliata - Kyushu Island in JapanJapan
- Tricyrtis puberula Nakai & Kitag. - China
- Tricyrtis setouchiensis Hir.Takah. - Honshu + Shikoku Islands in Japan
- Tricyrtis suzukii Masam. - Taiwan
Tricyrtis species are perennial herbaceous plants that grow at the edge of forests. They prefer shade or part shade and rich, moist soil. Toad Lilies bloom in summer to fall. They are hardy enough to handle sudden changes of winter from mild to blustery cold.
- Wallich, Nathaniel 1826. Tentamen Florae Napalensis Illustratae 61
- Kew World Checklist of Selected Plant Families
- "Tricyrtis Wallich". Flora of China.
- Maki, Masayuki; Morita, Hiroko; Oiki, Syuji; Takahashi, Hiroshi (1999). "The Effect of Geographic Range and Dichogamy on Genetic Variability and Population Genetic Structure in Tricyrtis Section Flavae (Liliaceae)". American Journal of Botany (Botanical Society of America) 86 (2): 287–292. doi:10.2307/2656945. JSTOR 2656945. PMID 21680367.
- George Schmid, W. (2002). An encyclopedia of shade perennials. Portland, Or.: Timber Press. p. 312. ISBN 0-88192-549-7.
- Ronse De Craene. Floral Diagrams: An Aid to Understanding Flower Morphology and Evolution. Cambridge University Press. pp. 105–. ISBN 978-1-139-48455-8.
- Masayuki Maki, Hiroko Morita, Syuji Oiki and Hiroshi Takahashi. 1999. The effect of geographic range and dichogamy on genetic variability and population genetic structure in Tricyrtis section Flavae (Liliaceae). Am J. Bot. 86: 287-292.
- Cox, Jeff (1998 by Rodale Press) Perennial All-Stars: The 150 Best Perennials for Great-Looking, Trouble-Free Gardens, pg. 305
- Pink, A. (2004). Gardening for the Million. Project Gutenberg Literary Archive Foundation. ISBN 1-4264-5707-3.
- Diversity of Life: Tricyrtis - retrieved 6 June 2006
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