生活型

herb

形態特徵

• Annual or perennial herbs, stems erect from prostrate base, 10–70 cm long, simple or branched.
• Leaves sessile, apex acute, base semiamplexicaul, margin serrate, glabrous, lower surface sparsely glandular; emergent leaves mostly opposite, rarely 3-verticillate, elliptic to oblong-lanceolate, 10–50 mm long, 5–15 mm wide; submerged leaves lacking.
• Flowers solitary or in racemes, pedicels 4–15 mm long. Calyx 6–8 mm long, cleft to beyond middle, sparsely pubescent; lobes 3.5–5.5 mm long; bracteoles linear, 1.5–3 mm long. Corolla tubular, pink or purple, 10–15 mm long; lobes 2–3 mm long.
• Capsule ellipsoid, ca. 5 mm long, ca. 4 mm across.

物候

Flowering time: October.

分布

• 台灣 : in ponds, rice fields and ditches on the western part of the island.
• 世界 : Tropical east Asia.

引證標本

TAICHUNG: Sekang, Sasaki s. n. 1932. PINGTUNG: Nanjenshan, Huang et al. 9554.

參考文獻

• Liu, Ho-Yih, Flora of Taiwan, second edition 4: 599. 1998.  (Fl. Taiwan 2nd edit.)
• Li, Flora of Taiwan 4: 568. 1978.  (Fl. Taiwan)