Volume 13 > Part 2 > Year 2016 > Page 304 > Compositae (Asteraceae) > Galinsoga

Galinsoga parviflora Cav.wfo-0000135740

Icon. [Cavanilles] 3: 41, t. 281. 1796; Backer & Bakh.f., Fl. Java 1: 414. 1965; Canne, Rhodora 79: 373. 1977; Shih, Fl. Reipubl. Popularis Sin. 75: 384. 1979; Grierson, Revis. Handb. Fl. Ceylon 1: 231. 1980; H.Koyama, Acta Phytotax. Geobot. 36:64. 1985; Grierson & D.G.Long, Fl. Bhutan 2(3): 1610. 2001; Y.S.Chen & D.J.N.Hind, Fl. China 20–21: 865. 2011. Fig. 54.

Accepted Name : This is currently accepted.

Description : Annual herb, 15–80 cm tall; stems from fibrous roots, erect or spreading, often branched, shortly hairy above, sometimes with gland-hairs. Leaves ovate or ovate-oblong, 1–5.5 by 0.5–3.5 cm, apex obtuse, base cuneate and tapering, 3-veined, margins shallowly serrate, both surfaces very thinly hairy. Inflorescences in cymose clusters; peduncles 7–25 mm long, pilose and glandular hairy. Capitula 4–7 mm diam. at flowering, often geminate; involucres hemispherical, 3–4 by 4.5–5 mm, sometimes glandular pilose; phyllaries 1- or 2-seriate, outer 2–3, oblong, 2–3 mm long, apex subacute, subglabrous, inner 5, ovate, ca 4 mm long, opposite ray florets; receptacle conical-convex, paleaceous, paleae oblong-spathulate, mostly with 2 very acute, lanceolate lateral lobes. Ray florets 5 per capitulum, rarely absent, pistillate, rays obovate-quadrate, white, apex 3-lobed, basal tube spreading pilose. Disc florets ca 30 per capitulum, bisexual; corollas yellow, apex 5-lobed, spreading pilose. Achenes obconical, blackish, setuliferous; of ray florets flattened, ca 2 mm long; pappus of scales, absent or reduced, ca 0.2 mm long; of disc florets angular, ca 1.5 mm long; pappus of fimbriate lanceolate scales, 1–1.3 mm long.

Thailand : NORTHERN: Chiang Mai (Doi Chiang Dao, Doi Sam Muen, Mae Sao Watershed Management Station, Pha Hom Pok).

Distribution : A herb of tropical American origin (Peru – type), now widespread throughout tropical and temperate countries.

Ecology : Cultivated fields of mountainous areas, 1,200–1,600 m alt. Flowering: all the year round.