Okia pseudobirmanica (H.Koyama) Bunwong, Chantar. & S.C.Keeley, 2014

Bunwong, Sukhonthip, Chantaranothai, Pranom & Keeley, Sterling C., 2014, Revisions and key to the Vernonieae (Compositae) of Thailand, PhytoKeys 37, pp. 25-101 : 84

Okia pseudobirmanica (H.Koyama) Bunwong, Chantar. & S.C.Keeley comb. nov.

Vernonia pseudobirmanica H.Koyama, Bull. Natl. Sci. Mus. Tokyo, Ser. B 29(1): 16. 2003.

Type.

Thailand, Tak, Khao Pha War, T. Shimizu, H. Toyokuni, H. Koyama, T. Yahara & T. Santisuk T-18505-bis (holotype: KYO!). Fig. 10B .

Description.

Perennial herbs, 20-40 cm tall. Stems erect, conspicuously ribbed, puberulous. Leaves cauline, 3-12 by 1-3 cm, elliptic or obovate, margin serrate, apex acuminate, base attenuate, chartaceous; upper surface glabrate or scabrous; lower surface glabrate or pubescent; lateral veins 7-12-paired; petioles up to 1 cm long. Capitulescences terminal, loosely corymbose. Capitula broadly campanulate, 5-6 mm long, pedunculate. Receptacle glabrous. Involucres broadly campanulate, in 4-5 series, ca. 5 mm long. Phyllaries imbricate, green, margin piliferous, outer surface nearly glabrous; the outer and the middle ones linear-oblong, apex acute; the inner ones ovate-lanceolate to oblong, apex obtuse. Florets ca. 20; corollas funnelform, purple, glabrous. Achenes fusiform, ca. 3 mm long, 10-ribbed, glabrous. Pappus in 2 series of bristles, the inner ones ca. 5 mm long.

Distribution.

Thailand: Tak, Kanchanaburi. Endemic.

Specimens examined.

Thailand, Tak, Khao Pha War, 16°46.32'N, 98°41.17'E, T. Shimizu, H. Toyokuni, H. Koyama, T. Yahara & T. Santisuk T-18505-bis (KYO); Kanchanaburi, Si Sa Wat, 13 Nov 1971, C.F. van Beusekom, C. Phengklai, R. Geesink & B. Wongwan 3746 (BKF, K, L, P).

Diagnostic characters.

Okia pseudobirmanica differs from Okia birmanica by its smaller capitula.

Ecology.

Rare on limestone, alt. 700-900 m; flowering November to December.

Vernacular name.

Tum Doi (ตุ้มดอย).

Figures

Figure 10. Morphology of Vernonieae in Thailand 6. A Okia birmanica B Okia pseudobirmanica C Pulicarioidea annamica D-E Strobocalyx arborea F Strobocalyx solanifolia G-H Struchium sparganophorum I Tarlmounia elliptica.