生活型

herb

形態特徵

• Annual herbs, profusely branching from the base, 5-15 cm long, with a stout, long taproot 5- 10 cm long. Stems erect, subquadrate, 0.8- 1.2 mm wide, narrower at base, with long slender, internodes 1-5 cm long, green flushed with purplish red.
• Leaves opposite, sessile, hard and straight, strigillose above; blades linear, 1- 3.5 cm long, 1-1.2 mm wide, acute to aristate at apex, rounded at base, revolute at margin, the midrib sunken above, raised below and strigillose; stipules adnate to the leaf-base, deltoid, 1 mm long and wide, hispidulous, with 2- 3 reddish, glabrous bristles 2- 4 mm long on upper margin.
• subsessile; bracts narrowly elliptic, 2 mm long, hypanthium 2 mm long, 1 mm wide, quadrangular, green flushed with purplish red, hispid; Calyx 4-lobed, the lobes lanceolate, acuminate, 2 mm long, 0.8 mm wide, reddish aristate at apex, hirsute on margin. Corolla tubular- funnelform, 4-lobed, 6 mm long, white, usually externally flushed with purplish red toward apex, tube 3.5 mm long, 2 mm wide, glabrous outside, sparsely pilose on lower inside, lobes erect or slightly preading, oblong, obtuse at apex, 2.5 mm long, 1 mm wide, glabrous; stamens 4, white, adnate to upper corolla tube, filaments 2 mm long, anthers oblong, 1 mm long; style 4 mm wide, white, glabrous, stigmas 2, clavate, 1 mm long, white.
• Capsules ovoid, 2.5- 3 mm across, sclerified, loculicidally dehiscent from the apex, surrounded with persistent calyx. Seeds numerous, 0.3-0.4 mm long, brownish, angled to depressed obconic; hilum punctiform, situated on a conspicuous central ridge, testa reticulate, areoles polygonal, with distinct areole walls, testa surface verrucose.
• Pollen grains 3-colporate, with microechinate and microperforate tecta.

物候

Flowering and fruiting are throughout the year.

分布

• 台灣 : This species is found on sandy soils, along seashores of the eastern part of Taiwan.
• 世界 : throuth southern India, Thailand, Java, to Malaysia and Singapore, and to southern China.

引證標本

Hualien Co.: Shou-Fong Hsiang, Ling-ding, elev. ca. 20-50 m, in grasslands, along sandy beach, Chen & Ho 106, 5 Apr. 2008, Chen s. n., and Su 676 (All at NHU). CHINA: Hainan: Chim Fung Mt., near Fong Ngau Po Village, Kan-en District, Lau 5663 (HAST).