龙舌草Ottelia alismoides

by Jun

  • Scientific Name: Ottelia alismoides (Linnaeus) Persoon
  • Ref: Syn. Pl. 1: 400. 1805.
  • Synonyms:
    Stratiotes alismoides Linnaeus, Sp. Pl. 1: 535. 1753;
    Damasonium alismoides (Linnaeus) R. Brown;
    D. indicum Willdenow, nom. illeg. superfl.;
    Ottelia alismoides f. oryzetorum Komarov;
    O. condorensis Gagnepain;
    O. dioecia S. Z. Yan;
    O. indica Planchon ex Dalzell & A. Gibson, nom. illeg. superfl.;
    O. japonica Miquel;
    S. quinquealatus Stokes, nom. illeg. superfl.
  • English Common Name: DUCKLETTUCE
  • Chinese Common Name: 龙舌草 long she cao
  • Family:Hydrocharitaceae
  • Genus: Ottelia
  • Distribution:Still or running water. Anhui, Fujian, Guangdong, Guangxi, Guizhou, NW Hainan, Hebei, Heilongjiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [Cambodia, India, Indonesia, Japan (including Ryukyu Islands), Korea, Laos, Malaysia, Myanmar, Nepal, New Guinea, Philippines, Thailand, Sri Lanka, Vietnam; Africa, Australia; introduced in North America].
  • Type: Stratiotes alismoides Linnaeus, Sp. Pl. 1: 535. 1753. INDIA: Without data (lectotype: Rheede, Hort. Malab. 11: t. 46. 1692). Lectotypified by D. A. Simpson, in C. E. Jarvis, Order out of Chaos 876. 2007.
    Ottelia dioecia S. Z. Yan, J. Sci. Med. Jinan Univ. 2: 162, f. 187. 1982. China, Guangdong(广东), Fu-san(佛山), 1965-08-21, Yan su-zhu(颜素珠) 92(Holotype:IBSC)
 Petiole varying greatly in length according to depth of water; leaf blade wholly submerged, varying greatly in shape and size, usually broadly ovate, ovate-elliptic, suborbicular, cordate, or sometimes lanceolate, ca. 20 × 18 cm or more, membranous. Flowers bisexual or plants occasionally dioecious-polygamous. Spathe 2.5-4 × 1.5-2.5 cm, 2- or 3-lobed at apex, with 3-6 longitudinal wings. Flowers solitary, sessile. Petals white, slightly purple, or bluish. Stamens 3-9(-12); filaments glandular hairy; anthers narrowly oblong, 3-4 mm. Ovary subglobose, with 3-9(or 10) carpels; styles 6-10, deeply 2-lobed. Fruit 2-5 × 0.8-1.8 cm. Seeds fusiform, 1-2 mm, densely hairy. Fl. and fr. Apr-Oct. 2n = 44.(Flora of China)
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