生活型

herb

形態特徵

• Rhizome short, elongate, bearing leaves and flowers at regular intervals.
• Petiole-like shoots with several nodes, simple, flexible; nodes occasionally rooting. Petioles 3-9 cm long; leaves on flowering stems alternate; blades floating, orbicular-rounded, 2-5(-8) cm in diameter, deeply cordate at base with narrow sinuses, purple on abaxial surface.
• Flowers usually 2 per node. Pedicels 1.5-4.5 cm long. Calyx deeply (4-) 5-lobed; lobes ovate-lanceolate, 3-6 mm long, glandular outside. Corolla yellow. Corolla tube 5-7 mm long, lobes (4) 5, obovate-oblong, 4-7 mm long, apex distinctly 2 lobed, margin with fimbriately toothed wings. Stamens as many as petals, inserted at the sinuses of the corolla, each with a small tufts of glandular hairs. Pistil bottle-shaped.
• Capsule ovoid or obovoid, 3.5-4.5 mm in diameter, 10-15-seeded. Seed ellipsoid, ca. 1 mm long, surface densely aculeate.
• This species is close to <i>N. peltala</i> (Gmel.) O. Kuntze, but differs from it by having unbranched stern, solitary leaf at stem, two flowers per node, much smaller flower (8-10 mm in diameter), and aculeate seed surface. On the other hand, <i>N. pellala</i> has branched stem, opposite leaves at upper portion of stem, large corolla (2.5-3 cm in diameter), and compressed seed with densely ciliate surface.

分布

• 台灣 : found in Taoyuan County, but no specimens have been collected recently.
• 世界 : S. India and Sri Lanka.

引證標本

Taoyuan: S. Sasaki s. n. Jun 1923 (TAl); Kizan, Heicho, Taiko, Y. Shimada 3461(NTUF); en route from Taoyuan 10 Nankan, Y. Yamamoto s. n. May 1929 (TAl).

引用文獻

• Sung-Po Li, Tsung-Hsin Hsieh and Chun-Chi Lin, Taiwania 47(4): 246-258. 2002.