Botanical name: Clarkella nana Family: Rubiaceae (Coffee family)
Synonyms: Ophiorrhiza nana, Clarkella siamensis, Ophiorrhiza pellucida
Dwarf Clarkella is a low perennail herb, up to 10 cm tall; tubers ellipsoid-oblong, 1-1.5 cm, scaly. Stems are unbranched, nearly round, hairless to densely hairy. Leaves are opposite or sometimes only 1 leaf developing at lowerlmost node; leaf-stalk 0.5-5 cm, hairless to finely velvet-hairy; blade drying membranous or thinly papery, ovate to broadly ovate, 1-6 × 1-4 cm, both surfaces hairless to finely velvet-hairy or villosulous, base blunt to cordulate and sometimes oblique, tip pointed to rounded; secondary veins 4-8 pairs; stipules triangular to narrowly triangular, 0.2-0.5 mm. Flowers are borne in 0.8-3 cm, 3-25-flowered clusters which are hairy to finely velvet-hairy; bracts ovate to narrowly oblong, 0.5-12 mm; flower-stalks 1-3.5 mm. Calyx is densely finely velvet-hairy to villosulous; hypanthium portion 1-2 mm; sepals triangular to ovate, 1-3 mm, markedly unequal on an individual flower. Flower outside villosulous to finely velvet-hairy; tube 10-14 mm; lobes elliptic to nearly round, about 3 mm, ciliolate. Fruit is 7-8 mm, villosulous, with calyx limb becoming 2-4.5 mm with increase in size principally in growth of basal, unlobed portion. Dwarf Clarkella is found on wet rocks, usually limestone, in the Himalayas, at altitudes of about 1400 m. Flowering: August.
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The flower labeled Dwarf Clarkella is ...