泰北五月茶 tai bei wu yue cha

Trees or shrubs up to 9 m tall; young twigs usually densely yellowish tomentose. Stipules needlelike, 1-3 × 0.2-0.5 mm, caducous; petiole 2-4(-11) mm, pubescent, glabrescent; leaf blade oblong to lanceolate, (3-)5-10(-12.5) × (1-)1.5-3(-4.2) cm, papery, glabrous except along midvein adaxially, yellowish pilose to glabrous all over but pubescent along veins abaxially, dull to moderately shiny, drying reddish brown, grayish green, or olive green, base acute, rarely obtuse or rounded, apex acuminate-mucronate; domatia often present; major veins impressed adaxially, lateral veins (5 or)6 or 7(-9) pairs, tertiary veins reticulate to weakly percurrent, highest venation finely tessellated. Inflorescences axillary and terminal, axes pubescent, males 4-11 cm, unbranched to 4-branched, females 3-8 cm, unbranched (to 2-branched), fruiting 6-14 cm. Male flowers: pedicels 0-1 mm; calyx 0.3-0.5 mm, cup- to bowl-shaped, 3- or 4-lobed, divided for 1/4-1/2 length, ± pubescent outside, glabrous to pubescent inside, with hairs especially at base, margin fimbriate, apex of lobes acute to rounded; disk annular, sometimes divided into free alternistaminal lobes, glabrous; stamens 3 or 4, 1.5-2.5 mm; rudimentary ovary clavate to terete. Female flowers: pedicels 0.2-1 mm, (1-)2-4 mm in fruit; calyx ca. 0.8 mm, cup- to pitcher-shaped, (3 or)4(or 5)-lobed, ± pubescent outside, glabrous inside but with long hairs at base, margin erose, otherwise as in males; disk glabrous; ovary glabrous; stigmas 4-8. Drupes ellipsoid, terete, abaxially and adaxially ridged, 3-5 × 2-3.5 mm, glabrous; style (sub)terminal. Fl. May-Jul, fr. Aug-Oct.

Mixed deciduous forests; 800-1200 m. S Yunnan [Laos, Myanmar, Thailand (not peninsular)].