《云南植物志》|| || ||茨藻科 Najadaceae nom. conserv.
279．茨藻科 Najadaceae nom. conserv.
一年生沉水草本，生长于淡水或咸水中；茎纤弱易脆，伸长，成对分枝，有时作二歧分枝，无刺或具刺。叶近对生，无柄，在叶鞘之上为狭线形，稀较宽，具粗锯齿或细齿（锯齿顶端常为黄褐色的单细胞弯刺），1脉，有时脉的背面具刺；叶鞘截形、圆形或上部延长为耳，边缘多少具刺；鳞片2，小，位于叶鞘内面。花小，花单性，绿色或带红色，生于小枝的基部，于叶鞘内单生，或少数集生，裸露或围以佛焰苞，雌雄同株，稀雌雄异株；花被1枚，顶端有2个唇形裂片；雄花有雄蕊1，花前通常无柄，包藏于佛焰苞内或无苞，花药顶生，4室，稀1室，紧贴于花被上；雌花裸露，稀具佛焰苞，无花被或有质地极薄的花被粘附在心皮上；心皮1枚、1室，柱头2—4枚；胚珠1，从子房基底直立，倒生，珠被2层。果实卵形，大部藏于叶鞘内，果皮薄，贴生于种皮上，不规则开裂；种子与果同形，无胚乳。
1属，约50种，广布于世界温带和亚热带地区，我国有8种，南北各省区都有，以台湾为多（7种），云南现发现4种。
Source 中国植物物种信息数据库
《Flora of North America》|| || || Najadaceae
197. Najadaceae A. L. de Jussieu
Naiad Family, or Water-nymph Family
Robert R. Haynes
Herbs, annual, rarely perennial, not rhizomatous, caulescent; turions absent. Leaves nearly opposite or appearing whorled, submersed, sessile; sheath not persisting longer than blade, not leaving scar when shed, not ligulate, not auriculate or rarely auriculate; intravaginal squamules scales, 2, linear. Inflorescences axillary, solitary flowers or cymes, often subtended by spathe as involucre, sessile or short-pedunculate. Flowers unisexual, staminate and pistillate on same or separate plants; subtending bracts absent; perianth absent; stamens 1; anthers dehiscing irregularly; pollen spheric; pistils 1, not stipitate; ovules basal, anatropous. Fruits achenelike. Seeds 1; embryo straight.
Genus Genera 1, species 40 (8 species in the flora): nearly worldwide.
SELECTED REFERENCES
Haynes, R. R. 1977. The Najadaceae in the southeastern United States. J. Arnold Arbor. 58: 161--170. Shaffer-Fehre, M. 1991. The endotegmen tuberculae: An account of little-known structures from the seed coat of the Hydrocharitoideae (Hydrocharitaceae) and Najas (Najadaceae). Bot. J. Linn. Soc. 107: 169--188. Shaffer-Fehre, M. 1991b. The position of Najas within the subclass Alismatidae (Monocotyledones) in the light of new evidence from seed coat structures in the Hydrocharitoideae (Hydrocharitales). Bot. J. Linn. Soc. 107: 189--209. Thorne, R. F. 1993c. Hydrocharitaceae. In: J. C. Hickman, ed. 1993. The Jepson Manual: Higher Plants of California. Berkeley, Los Angeles, and London. Pp. 1150--1151.
Source eFloras.org
《Flora of North America》|| || || Najadaceae
197. Najadaceae A. L. de Jussieu
Naiad Family, or Water-nymph Family
Robert R. Haynes
Herbs, annual, rarely perennial, not rhizomatous, caulescent; turions absent. Leaves nearly opposite or appearing whorled, submersed, sessile; sheath not persisting longer than blade, not leaving scar when shed, not ligulate, not auriculate or rarely auriculate; intravaginal squamules scales, 2, linear. Inflorescences axillary, solitary flowers or cymes, often subtended by spathe as involucre, sessile or short-pedunculate. Flowers unisexual, staminate and pistillate on same or separate plants; subtending bracts absent; perianth absent; stamens 1; anthers dehiscing irregularly; pollen spheric; pistils 1, not stipitate; ovules basal, anatropous. Fruits achenelike. Seeds 1; embryo straight.
Genus Genera 1, species 40 (8 species in the flora): nearly worldwide.
SELECTED REFERENCES
Haynes, R. R. 1977. The Najadaceae in the southeastern United States. J. Arnold Arbor. 58: 161--170. Shaffer-Fehre, M. 1991. The endotegmen tuberculae: An account of little-known structures from the seed coat of the Hydrocharitoideae (Hydrocharitaceae) and Najas (Najadaceae). Bot. J. Linn. Soc. 107: 169--188. Shaffer-Fehre, M. 1991b. The position of Najas within the subclass Alismatidae (Monocotyledones) in the light of new evidence from seed coat structures in the Hydrocharitoideae (Hydrocharitales). Bot. J. Linn. Soc. 107: 189--209. Thorne, R. F. 1993c. Hydrocharitaceae. In: J. C. Hickman, ed. 1993. The Jepson Manual: Higher Plants of California. Berkeley, Los Angeles, and London. Pp. 1150--1151.
Source eFloras.org
