生活型

herb

形態特徵

• Perennial or annual, floating aquatic herbs. Rhizoids usually present, verticillate at base or slightly above base of peduncle, fusiform, inflated, with filiform branches. Stolons filiform to relatively thick, branched.
• Leaves numerous on stolons, 2–8 cm long, divided from base into 3–4(–5) semiverticillate primary segments; each primary segment ovate to oblong-lanceolate in outline, 1.5–3 cm wide, pinnately divided, each pinna dichotomously divided from base into numerous further segments, ultimate segments capillary, slightly flattened, laterally and apically setulose; stipule-like auricles usually present at base of primary segments, semicircular in outline, divided dichotomously into filiform, sparsely setulose segments. Traps on leaf segments, obliquely ovoid, 1–4 mm long, stalked; mouth lateral or basal, naked or with 2 dorsal, sparsely branched setiform appendages.
• Inflorescences erect, 5–25 cm long, 3–10-flowered, glabrous; peduncle terete, 0.5–1.5 mm thick; scales absent; bracts basifixed, broadly ovate to circular, 1–2 mm long, apex rounded; bracteoles absent; pedicels dorsiventrally compressed, erect at anthesis, sharply deflexed and thickened in fruit, 4–20 mm long. Calyx lobes subequal, ovate, apex rounded to subacute, lower lobe often slightly broader, 2–3 mm long at anthesis, becoming fleshy and much larger, up to 7–9 mm long, spreading or reflexed in fruit. Corolla pale yellow, 10–15 mm long, pubescent or glabrous; upper lip broadly ovate, apex rounded; lower lip transversely elliptic, base with a prominent bilobed swelling, apex rounded or emarginate; palate pubescent; spur cylindrical from a narrowly conical base, apex obtuse or subacute, straight or slightly curved, about as long as and parallel with lower lip. Filaments curved, 1–1.5 mm long; anther thecae more or less confluent. Ovary ovoid; style distinct; lower lip of stigma semicircular, upper lip obsolete.
• Capsule globose, 4–5 mm in diam., circumscissile; persistent style greatly enlarged and elongated, often equalling or exceeding capsule. Seeds prismatic, 1–2 mm wide, 5–6-angled, narrowly winged on angles; testa with obscurely reticulate prominences.

物候

Flowering June to September, fruiting July to October.

分布

• 台灣 : in pools, lakes, swamps and rice fields at low elevation.
• 世界 : Eastern and southern Asia and Australia.

引證標本

TAIPEI: Shihlin, Simada s. n. 1914; Lusutann, Hsu 5336; Neihu, Masamune 2839; Niupu, Kawakami & Simada 4409; Taan, Simada 1379; Kungkuan, Mori s. n. 1935; Peitou, Yang 10777; Chihsingshan, Nakamura 4758; Menghu, Chiang & Liu 1; Shiting; Kawakami & Juji s. n.1914. TAOYUAN: Tashulin, Kuo s. n. 1967. HSINCHU: Kawakami & Simada s. n. 1907. PINGTUNG: Hengchun, Kawakami & Ito s. n. 1909.

引用文獻

• LI, Zhen-Yu, Flora of Taiwan, second edition 4: 719. 1998.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)