Ethulia conyzoides
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Ordo: Asterales
Familia: Asteraceae
Genus: Ethulia
Name
Ethulia conyzoides L., Sp. Pl.: 1171. 1763. – Wikispecies link – IPNI link – Pensoft Profile
Type
Egypt, P. Forsskal 1387 (holotype: K!).
Description
Annual herbs, 50–150 cm tall. Stems erect, conspicuously ribbed, puberulous. Leaves alternate, 5–8 by 1–2 cm, elliptic or lanceolate, margin serrate, apex acuminate or acute, base attenuate, chartaceous; both surfaces ferrugineous with unicellular hairs and capitate glands, shortly petiolate. Capitulescences terminal and axillary, corymbose. Capitula hemispherical, 3–4 mm long. Receptacle ca. 1.5 mm in diam., glabrous. Involucres semispherical, in 3–4 series, 1.5–2 mm long, 1–2 mm in diam. Phyllaries imbricate, green with purple apex, margin piliferous, outer surface puberulous, glands capitate; the outer and the middle ones ovate to lanceolate, apex acute; the inner ones lanceolate to oblong, apex acute. Florets 20–30; corollas funnelform, purple, glandular; corolla tubes 0.5–1 mm long; corolla lobes ca. 1 mm long. Anthers 1.5–2 mm long, apical appendage acute, base obtuse. Styles purple, inner surface covered with stigmatic papillae, sweeping hairs. Achenes turbinate, 1.5–2 mm long, glandular, 6-ribbed. Pappus absent.
Distribution
Thailand: Chiang Rai, Chiang Mai, Nakhon Phanom. Tropics.
Specimens examined
Thailand: Chiang Rai, Mae Kok riverbank, Lamnam Kok national park, 19°57.49'N, 99°41.14'E, 14 Jun 1925, H.B.G. Garrett 227 (BKF, BM, K); Nakhon Phanom, 10 May 1932, A.F.G. Kerr 21396 (BK, BM, K); Nakhon Phanom, 9 May 1932, A.F.G. Kerr 21809 (K).
Diagnostic characters
Ethulia conizoides is distinguished by achenes having 4–6 ribs, pappus and carpopodium are absent.
Ecology
Open area along river bank in evergreen forest, alt. 200–400 m; flowering May to September.
Vernacular name
Ya Hua Mud (หญ้าหัวหมุด).
Taxon Treatment
- Bunwong, S; Chantaranothai, P; Keeley, S; 2014: Revisions and key to the Vernonieae (Compositae) of Thailand PhytoKeys, 37: 25-101. doi
