生活型

herb

形態特徵

• Perennial aquatic herb with stout, mostly branched rhizomes.
• Leaves broadly ovate to elliptic, 8-12 cm long, 7-9 cm wide, rounded at apex, cordate to sagittate-cordate at base, margins entire, glabrous above, hirsute beneath; petioles long, the length depending on water depth.
• Flowers yellow, pedunculate; sepals 5, ovate to spatulate ovate, ca. 2 cm long, 13 mm wide, rounded or slightly emarginate at apex; petals many, staminoidal, ca. 6 mm long, 3 mm wide; stamens numerous, ca. 1 cm long including anthers; ovary ovate-globose, stigmatic rays ca. 10, reddish.
• Fruit broadly ovoid-globose.

分布

• 台灣 : Very rare, currently sporadic in a few ponds in Taoyuan County; flowering year-round.

引證標本

TAOYUAN: Lungtan, Kao 10711; Chungli, Sasaki s. n. 1917. HSINCHU: Nankan, Susuki s. n. 1931; Shimpo, Shimada s. n. 1915.

參考文獻

• YANG, YUEN-PO and LU, SHENG-YOU, Flora of Taiwan, second edition 2: 611. 1996.  (Fl. Taiwan 2nd edit.)