Struchium sparganophorum
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Ordo: Asterales
Familia: Asteraceae
Genus: Struchium
Name
Struchium sparganophorum (L.) Kuntze, Revis. Gen. Pl. 1: 366. 1891. – Wikispecies link – IPNI link – Pensoft Profile
- Ethulia sparganophora L., Sp. Pl.: 1171. 1763.
- Sparganophoros vaillantii Crantz, Inst. Rei. Herb. 1: 261. 1766.
- Ethulia struchium Sw., Prodr. 111. 1788.
Type
Jamaica (not seen). Figs 10G–H.
Description
Annual, 20–50 cm tall. Stems erect, inconspicuously ribbed, puberulous. Leaves 4–12 by 2–15 cm, elliptic, pubescent, margin serrate, apex acute, base attenuate, chartaceous; both surfaces puberulous with cylindrical hairs and capitate glands; lateral veins 7–11-paired; petioles up to 12 mm long. Capitulescences axillary, solitary or clustered. Capitula hemispherical, sessile, 4–6 mm in diam. Receptacle convex, 2–2.5 mm in diam., glabrous. Involucres 3–4 series, 3–4 mm long, imbricate, hemispherical. Phyllaries light green, margin piliferous, outer surface puberulous without glands; the outer ovate to lanceolate, apex acute to acuminate; the inner ones obovate-lanceolate, apex acuminate. Florets 50–70; corollas funnelform, white, glandular; corolla tubes 1–1.5 mm long; corolla lobes 3–4, 0.5–1 mm long. Anthers ca. 1 mm long, apical appendage acute, base acute. Styles purple, ca. 2 mm long, branches 1–1.5 mm long, inner surface covered with stigmatic papillae. Achenes turbinate, 3–4-angular, 1–1.5 mm long, 3–5-ribbed, glandular. Pappus of 3–4 parts, coroniform, ca. 1 mm long, whitish.
Distribution
Thailand: Lamphun, Nakhon Phanom, Kanchanaburi, Bangkok, Ranong, Phangnga, Krabi, Trang, Songkhla, Yala. Tropics.
Specimens examined
Thailand, Phang Nga, Muang district, 8°26.55'N, 98°31.16'E, 1 Aug 2002, S. Bunwong 28 (KKU); Lamphun, Muang District, 20 Dec 1994, P. Palee 265 (BKF, CMU, L); Bangkok, Klong San, 20 Feb 1971, J.F. Maxwell 71-107 (AAU, BK, L); Lad Yao, 27 Sep 1984, Y. Paisooksantivatana 1433-84 (BK); Ranong, Kra Buri, 10 Apr 1967, C. Chermsirivathana 1266 (BK, L); Kra Buri, S. Sutheesorn 2275 (BK); Ka Pur, 7 Dec 1979, T. Shimizu, H. Toyokuni, H. Koyama, T. Yahama & C. Niyomdham 26302 (AAU, BKF, L); Trang, Khao Chong, 13 Aug 1975, J.F. Maxwell 75-824 (AAU, BK, L); Songkhla, Rattaphume, 3 Aug 1986, J.F. Maxwell 86-636 (AUU, BKF, L); Rattaphume, J.F. Maxwell 86-911 (BKF, L).
Diagnostic characters
Distinct characters of Struchium sparganophorum are the sessile capitula in axillary head, achenes with coroniform pappus, and florets with 3–4 corolla lobes.
Ecology
Open sandy grassland or secondary evergreen forest, alt. 50–400 m; flowering August to April.
Vernacular name
Muk Din (มุกดิน).
Taxon Treatment
- Bunwong, S; Chantaranothai, P; Keeley, S; 2014: Revisions and key to the Vernonieae (Compositae) of Thailand PhytoKeys, 37: 25-101. doi
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