形態特徵

• Main stems creeping, 3-10 cm long, stramineous, glabrous, angular, rooting at intervals but mostly near base.
• Leaves dimorphic; lateral leaves unegual-sided, ovate-lanceolate, ciliate, acute or obtuse at apex, pointing outwards; median leaves nearly equal-sided, ovate, with prominent midrib, ciliate, cuspidate at apex, pointing upwards; axillary leaves equal-sided, ovate, acute at apex, ciliate at base.
• Strobili terminal, 5-10 mm long; sporophylls dimorphic, those of the upper side unequal-sided, lanceolate, ciliate, acuminate at apex; those of the lower side equal-sided, ovate, keeled, acuminate at apex, the margins with long conspicuous cilia.

分布

• 台灣 : Growing on exposed grassy banks throughout the Island.
• 世界 : China, India, the Philippines, New Guinea and northern Australia.

引證標本

TAIPEI: Kuangyingshan, Suzuki s. n. 1930. HSINCHU: Chingtsaohu, Kao 4679. NANTOU: Sun Moon Lake, Kudo 15703. TAINAN: Hsinhua Forest Station, Shieh & Tsai 7592*. PINGTUNG: Pingtung, Matuda s. n. 1916. HUALIEN: Mataian, Suzuki 5199.

參考文獻

• TSAI, JINN-LAI and SHIEH, WANG-CHUENG, Flora of Taiwan, second edition 1: 46. 1994.  (Fl. Taiwan 2nd edit.)