Ethulia conyzoides L., Sp. Pl.: 1171. 1763.
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publication ID |
https://dx.doi.org/10.3897/phytokeys.37.6499 |
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persistent identifier |
https://treatment.plazi.org/id/37E84845-74A7-A42C-E7EB-8BCE213F368A |
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treatment provided by |
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scientific name |
Ethulia conyzoides L., Sp. Pl.: 1171. 1763. |
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Ethulia conyzoides L., Sp. Pl.: 1171. 1763.
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).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.