对轮叶虎耳草 dui lun ye hu er cao

Plants many branched, dwarfish, densely cespitose. Shoots to 12 cm. Flowering stem ca. 3 mm, glandular pilose. Shoot leaves in opposite pairs with bases connate-perfoliate on slender shoots, 3-verticillate with bases partly connate-perfoliate on thick shoots, imbricate, subelliptic, 3-4 × 1.5-2 mm, both surfaces glabrous, chalk glands 3-7, margin cartilaginous denticulate-ciliate proximally, apex usually recurved, subacute. Flower solitary; hypanthium glandular pilose. Sepals subrecurved, broadly triangular-ovate, ca. 2.5 × 3 mm, abaxially and marginally glandular pilose, chalk gland 1, veins 3, confluent at apex, apex obtuse, subleathery, glabrous. Petals white, obovate to narrowly so, 6-7 × ca. 3 mm, 5-veined, base gradually narrowed into an obscure claw, margin subundulate, apex obtuse. Stamens ca. 4.5 mm; anthers black. Carpels connate proximally; ovary semi-inferior; styles ca. 2.5 mm. Fl. Jul-Aug.

* Rock crevices; 3400-3500 m. SE Xizang (Mainling Xian).