stem twining, branching, velvety-pubescent; leaves herbaceous; petiole 2–4 lin. long, pubescent like the stem; blade 2/3–1 1/3 in. long, 3–8 lin. broad, ovate or ovate-lanceolate, obtuse or acute, broadly cuneate at the base, nearly glabrous above, velvety-puberulous beneath; peduncle 1/2– 2/3 in. long, lateral at the nodes, bearing 1 or 2 umbel-like 3–7-flowered cymes, slightly puberulous; bracts minute; pedicels 2–2 1/2 lin. long, glabrous; sepals about 3/4 lin. long, 1/3 lin. broad, ovate, obtuse, thinly puberulous and ciliate; corolla lobed nearly to the base, dull purple; lobes very spreading, 2 1/2 lin. long, 1 1/4 lin. broad, ovate-oblong, very obtuse, glabrous on both sides; corona-tubercles 1/3– 2/5 lin. long, ovate in dorsal view, subacute, constricted on the inner face into a sort of keel by which they are adnate to their tips to (but do not exceed) the filament part of the 3/4 lin.-long staminal column; anthers transversely oblong, with short transverse subtruncate appendages inflexed upon the margin of the style-apex, which has a small truncate central boss; pollen-masses distinctly pendulous. null