生活型

herb

形態特徵

• Erect perennial herbs; stolons creeping; stems terete, with small black spots, 30–60 cm tall, simple or with few branches above.
• Leaves subopposite or alternate, elliptic or lanceolate, 4–7 cm long, 1–2 cm wide, apex acute or obtuse, entire, sessile or subsessile.
• Racemes terminal, densely many-flowered, 10–20 cm long, glabrous or minutely glandular hairy, pedicel ca. 3 mm long; bracts acicular, 3–5 mm long. Flowers white, 5–6 mm across; calyx 5-parted, segments ovate-oblong, acute or obtuse, membranaceous, margin ciliate, with black glandular dots, ca. 2 mm long; corolla-lobes oblong, rounded, obtuse, ca. 3–5 mm long; stamens 5, filaments ca. 0.5 mm long; anthers broadly ovate, ca. 0.6 mm long; ovary globose, style ca. 1 mm long.
• Capsules globose, 2–2.5 mm in diameter, style persistent.

物候

Flowers: May-Jul.

分布

• 台灣 : in wet places by rivers and ponds in lowlands in the north.
• 世界 : Japan, Korea, the Ryukyus, Indochina and SE China.

引證標本

TAIPEI: Linkou, Peng 8585; Pinghsi, Wang 1377. ILAN: Taipingshan, Suzuki s. n. 1925. TAOYUAN: Yangmei, Kuo 11119; Taoyuan, Suzuki 4638. HSINCHU: Lienhuashih, Peng 7231; Hukou, Peng 7244. NANTOU: Sun Moon Lake, Kudo & Sasaki 15399.

參考文獻

• KAO, Muh-Tsuen and PENG, Ching -I, Flora of Taiwan, second edition 4: 66. 1989.  (Fl. Taiwan 2nd edit.)