Stem slender, woody. Leaves crowded, ascending; petiole channelled, 2-4 in. long, dilated at the base; blade thin, oblong-cuspidate, unspotted, 4-5 in. long, 2½-3 in. broad at the middle, with a deltoid base and midrib visible beneath only near the base. Raceme simple, lax, shortly peduncled; flowers few in a fascicle; pedicels short; bracts minute. Perianth ¾-⅞ in. long; segments as long as the cylindrical tube. Stamens rather shorter than the perianth-segments. Style not exserted.