北酸角杆 bei suan jiao gan

Oritrephes septentrionalis W. W. Smith, J. Proc. Asiat. Soc. Bengal 7: 69. 1911; Anplectrum yunnanense Kraenzlin; Medinilla caerulescens Guillaumin; M. caerulescens var. nuda Craib; Pseudodissochaeta septentrionalis (W. W. Smith) M. P. Nayar.

Shrubs 1-5(-7) m tall, many branched, erect or sometimes scrambling. Branches terete, glabrous with thin brown bark. Petiole 0.4-0.9 mm; leaf blade lanceolate, ovate-lanceolate, or broadly ovate, 7-8.5 × 2-2.5 cm, papery, abaxially ± furfuraceous, adaxially glabrous, secondary veins 2 on each side of midvein, base obtuse to subrounded, margin sparsely serrulate apically from middle, apex caudate-acuminate. Inflorescences axillary, cymose, 3.5-5.5 cm, (1 or)3(or 5)-flowered, glabrous; peduncle 1-2.5 cm. Hypanthium campanulate, 4-4.5 mm, densely tuberculate, with very scattered glandular trichomes or glabrous. Calyx lobes inconspicuous, apiculate. Petals pink, lavender, or purplish red, triangular-ovate, 8-10 mm, base slightly oblique, apex acute. Stamens 8, subequal. Longer (outer) stamens with filaments 4.5-5.5 mm; anthers ca. 7 mm. Shorter stamens with filaments 3-4 mm; anthers ca. 6 mm, base tuberculate. Connective slightly decurrent and forming a short spur. Ovary ovoid, apex 4-undulate. Berry urceolate, ca. 7 × 6 mm. Seeds cuneate, densely tuberculate. Fl. Jun-Sep, fr. Feb-May.

Dense forests, forest margins, damp shady areas; 200-1800 m. Guangdong, Guangxi, Yunnan [Myanmar, N Thailand, Vietnam].