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THAI FOREST BULLETIN (BOTANY) 36

Ecology.— In dry evergreen forest.Altitude ca 650 m. FloweringAugust, September.

Conservation Status.— Possible Near Threatened (NT) (IUCN 2001). Argyreia variabilis is known from only two collections from Phetchaburi province and seems to be represented by just a few populations in Kaeng Krachan National Park. Based on the limited evidence available at this time, NT seems the most appropriate conservation status for it.

Etymology.— The epithet, variabilis, refers to the corolla color, which varies from pinkish to dark purple with a paler limb.

B. Argyreia leucantha Traiperm & Staples, sp. nov. similis A. thorelii, sed corolla campanulata, alba, ceracea differt. Type: Thailand. EASTERN: Ubon Ratchathani, Pha Taem National Park, 20 July 2002, Traiperm 17 (holotype BKF; isotypes—to be distributed—A, BCU (×2), K, KKU, L). Fig, 5.— A. cf. laotica sensu Traiperm, Tax. Study Argyreia Thailand. 51. Fig. 13, Plate 5 e-f, 2002, non Gagnep. in H.Lecomte, Notul. Syst. (Paris) 3: 134. 1915; Gagnep. & Courchet in H. Lecomte, Fl. Indo-Chine 4: 276. 1915. Fig. 5 & Fig. 6.

Twining plant, stems terete, sparsely brown-pilose, arising from enlarged, swollen roots; internodes ca 2–8 cm; sap milky. Leaves elliptic, oblong-lanceolate or oblong-elliptic, 6–12 by 1–5 cm, base obtuse, attenuate or rounded, margins entire, apex acute, obtuse, acuminate, or rounded, mucronulate, chartaceous, both sides appressed-pilose; lateral nerves 7–10 pairs on each side of midrib, indistinct but midrib prominent beneath; petiole 5–8 mm long, terete, slightly appressed hirsute. Inflorescences axillary, subcapitate cymes, 2–9-flowered; peduncles 4–9 mm long, brown hirsute; pedicels 3–9 mm long, slightly pilose; bracts elliptic-oblong, 1.5–2 cm long, apex acute, base rounded, yellowish brown-pilose, persistent. Flowers showy; sepals unequal, lanceolate, ovate, or oblong, 2 outer sepals 25– 28 by 5–6 mm, base rounded, apex acute, outside densely patent brownish hirsute, inside glabrous, 3 inner sepals smaller, middle densely brown-hirsute, margins glabrous; corolla waxy, campanulate, 5–6 cm long, limb shallowly lobed, white tinged greenish, outside glabrous or glabrescent, inside tube base white or dark purple, glabrous; stamens included, equal, 28–29 mm long, white, filament bases dilated and hairy, anthers 5–6 mm; disk annular, entire, ovary glabrous, 2-celled; style included, 30–33 mm long, jointed above base (or not), white; stigma biglobose. Fruit pendulous, clasped by accrescent calyx until ripe, sepals then wide-spreading, densely golden-hispid outside, glossy tan and glabrous inside, the tips recurved; berry subglobose, 7–8 mm diameter, dark brown when ripe, glabrous, capped by persistent style. Seeds 4 (or less), 5–6 mm long, brownish yellow, glabrous.

Thailand.— NORTHEASTERN: Mukdahan [Mukdahan sandstone outcrop ca 800 m S of headquarters, 17 Oct. 1998,

National Park, on bare ilkin et al. 991 (BKF, K,

photo)]; EASTERN: Ubon Ratchathani [Phibun Mangsahan Distr., Phibun Mangsahan, 21 Aug. 2001, Pooma et al. 2245 (L); Khong Chiam Distr., Pha Taem National Park, 25 July 2001, Traiperm 17 (A, BCU, BKF, K, KKU, L); ibid., 20 July 2002, Traiperm 29 (BCU), same

locality,

Boonjaras

74

(BCU);

Khong

Chiam

Distr.,

about

51.5

km

along

Hwy.

2134,

29

Nov.

1985, 2001,

Staples & Wongprasert 363 (A, AAU, BKF, K, L, P), Pooma et al. 2260 (L), Phranin Waterfall, 25 Oct. 1998,

Khua Nangnee Falls, 22 Aug. Wongprasert et al. s.n. (BKF),

Ubon Ratchathani Gene Conservation Station, near Bahai 01–403 (BKF); Chong Mek distr., Wat Sirindhornwararam, 24 (BKF)].

village, 14 Sept. 2001, Maxwell 27 Sep. 2003, Wongprasert 039–

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