生活型

herb

形態特徵

• Subglabrous herb, creeping and rooting at the nodes, the stems at most ascending decumbent, finely puberulent, up to 40 cm or perhaps more in length, matted.
• Leaves ovate to elliptic ovate, 0.5–2.5 cm long, 0.4–2 cm wide, abruptly narrowed to a winged petiole up to 7 mm long, or subsessile, glabrous, the apex acute; main veins 4–7 on each side of midrib; submarginal vein absent.
• Flowers axillary. Sepals 4, deltoid-acute, 1–3 mm long, 1–1.7 mm wide, very finely puberulent along margins. Petals 0. Stamens 4; filaments translucent, 0.5-0.8 mm long, dilated below; anthers 0.6-0.9 mm long and wide, nearly basifixed, dull yellow, the connective orange on its abaxial side; anthers introrse, shedding pollen directly on the stigma at anthesis. Pollen grains shed singly. Disc raised 0.1-0.2 mm high, glabrous, prominently 4-lobed, green, the lobes opposite the petals. Style green, 0.6–1 mm long; stigma dark green, globose, 0.3- 0.5 mm thick.
• Capsules elongate-globose, 3–5 mm long, 2.5–3.5 mm thick, finely puberulent, corky-walled but readily and irregularly loculicidal, on a short pedicel. Seeds pluriseriate in each locule of the capsule, free, light or glossy red-brown, 0.7-0.9 mm long, the body 0.35-0.4 mm thick, apiculate; raphe inflated, 0.2-0.5 mm across, coarsely reticulate.
• 2n = 32.

分布

• 台灣 : Rare and local in moist places, especially on the beds and along borders of lakes and ponds, flowering when these dry out in late summer.
• 世界 : Central and southern Japan, north China, and Taiwan.

引證標本

TAIPEI: Tatunshan, Peng 9496; Fushan, Peng 15149. HSINCHU: Hukou, Shimada 4944. ILAN: Mingchih, Hsiao s. n. 1988; Nanao, Peng 13816. PINGTUNG: Mutanwan, Matuda s. n. 1919; Nanjenshan, Peng 7795.

引用文獻

• RAVEN, PETER H. and PENG, CHING-I, Flora of Taiwan, second edition 3: 960. 1993.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)