形態特徵

• Summer, aquatic form: Plants growing in deep water have their leaflets floating on water, the succulent stipes up to 30 cm long; those in shallow water have erect stipes 8-10 cm long; leaflets 20 mm long, entire or crenate; areolae linear, narrow; rhizome internodes 6-9 cm long.
• Winter, terreestrial form: Plants growing on drained fields much small, the internodes short, about 1-4 mm long, the stipes 2-8 cm long; leaflets 5-10 mm long; sporocarps 1-2, borne at or near base of stipe, on separate stalks, oval, hairy, the upper tooth acute, the lower tooth blunt.

分布

• 台灣 : Growing in paddy fields, along ditches and ponds.
• 世界 : Malaya, Indonesia, the Philippines, Hongkong.

引證標本

AIPEI: NTU Campus, DeVol 7617, Kuo 6822; Neihu, Kuo 780*. ILAN: Lotung, Yamamoto 2632. TAICHUNG: Tongshih, DeVol 4386. NANTOU: Sun Moon Lake, Kudo & Sasaki 15525. YUNLIN: Shihkuei, DeVol 7757. CHIAYI: Chiayi City, Yamashita 30. TAINAN: Tainan City, Moritani 78. PINGTUNG: Liukiusyo, Hosokawa 1604; Kuskus, Kudo & Sasaki 15912; Mutan, Hsu 14277.

參考文獻

• DEVOL, CHARLES E. and SHIEH, WANG-CHUENG, Flora of Taiwan, second edition 1: 537. 1994.  (Fl. Taiwan 2nd edit.)