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FOC | Family List | FOC Vol. 19 | Lentibulariaceae | Utricularia

1. Utricularia minutissima Vahl, Enum. Pl. 1: 204. 1804.

斜果挖耳草 xie guo wa er cao

Utricularia brevilabris Lace; U. brevilabris var. parviflora Pellegrin; U. evrardii Pellegrin; U. lilliput Pellegrin; U. nigricaulis Ridley; U. nipponica Makino; U. siamensis Ostenfeld.

Annuals, terrestrial. Rhizoids capillary, simple. Stolons capillary, sparsely branched. Traps on rhizoids, stolons, and leaves, stalked, ovoid, ca. 0.2 mm, mouth lateral; appendage 1, dorsal, subulate, with 1 or 2 ventral pairs of trichome rows. Leaves few, from peduncle base and stolons, glabrous; leaf blade narrowly obovate to linear, 0.3-2 cm × 0.4-0.8 mm, membranous, vein 1, base attenuate onto petiole, margin entire, apex slightly obtuse. Inflorescences erect, 3-12 cm, 1-10-flowered, glabrous; peduncle terete, 0.2-0.4 mm thick; scales few, similar to bracts; bracts basifixed, narrowly ovate, 0.5-1 mm, apex acute. Pedicel erect, ± as long as bracts, filiform; bracteoles similar to bracts but sometimes narrower or less acute. Calyx lobes convex, 1.5-2 mm, subequal, glabrous; lower lobe apex emarginate; upper lobe ovate, apex obtuse. Corolla violet or white, 3-7 mm; lower lip suborbicular, base with a rounded 4-lobed swelling, margin distinctly 3-lobed; spur subulate, much longer than lower corolla lip, apex acute; upper lip oblong to obovate, apex emarginate to rounded. Filaments ca. 0.8 mm, slightly curved; anther thecae distinct. Ovary ovoid; style short; stigma lower lip transversely elliptic, upper lip deltoid. Capsule obliquely ellipsoid, 1.5-2 mm, dehiscing by a single longitudinal ventral slit. Seeds globose to broadly ellipsoid, 2-3 mm; seed coat with prominent reticulations. Fl. Sep-Nov, fr. Nov-Dec. 2n = 16.

Sandy soil in open areas, grassy places, wet rocks; near sea level. Fujian, S Guangdong, Guangxi, S Jiangsu, Jiangxi [Cambodia, India, Indonesia, S Japan, Laos, Malaysia, Myanmar, Papua New Guinea, Philippines, Sri Lanka, Thailand, Vietnam; N Australia].


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