特徵描述
作者
YANG, YUEN-PO and LU, SHENG-YOU
型態特徵
Annual or perennial aquatic herbs with horizontal or vertical rhizomes. Leaves simple, alternate, long-petiolate, submersed and/or emergent, blades linear, sagittate, cordiform or orbicular. Flowers axillary, solitary on long peduncles, emergent, bisexual, actinomorphic, hypogynous to perigynous; sepals 4-6, green to petaloid; petals 0-numerous; stamens numerous, anthers elongate; ovary compoud, of 3-35 united or partially united carpels, multilocular; stigmas many, united into a disc with radiating rays; ovules numerous, usually anatropous, rarely orthotropous. Fruit a spongy berry, many-seeded; seeds ovoid to subovoid, operculate, mostly arillate; embryo small, with 2 thick, fleshy cotyledons; endosperm scanty.
屬
About six genera, cosmopolitan; three genera in Taiwan.
參考文獻
Nuphar 萍蓬草屬
作者
YANG, YUEN-PO and LU, SHENG-YOU
型態特徵
Perennial herbs with stout creeping rhizomes. Leaves floating, broadly elliptic, orbicular to lanceolate, long-petiolate. Flowers solitary, emergent, long pedunculate; sepals 5-14; petals many, small; stamens numerous, filaments flattened, anthers introrse; ovary many-celled, superior, apically constricted below stigmatic rays. Fruit ovoid, dehiscent irregularly; seeds ovoid, without an aril.
