Crepidorhopalon

Small annual herbs; roots whitish; stems erect or ascending, sparingly branched, +/- glabrous, quadrangular, ribbed to almost 4-winged because of decurrent leaf bases. Leaves opposite and decussate, mostly sessile, lowermost sometimes shortly petiolate, broad-based; lower ones +/- equal, ovate to linear-lanceolate, entire to remotely serrulate, 1-3-veined with veins arising from base; upper pairs smaller, often very unequal. Flowers 1 per node, shortly pedicellate, bracteate, lower ones axillary, upper ones in lax to spike-like, few-flowered, terminal racemes. Bracts in unequal pairs, one +/- leaf-like, other smaller, +/- subulate. Calyx 5-lobed and 5-ribbed or winged; tube cylindrical to bilabiate; lobes +/- as long as tube or much shorter. Corolla bilabiate; tube cylindrical; limb with upper lip shortly 2-lobed, somewhat hooded, exterior in bud; lower one larger, 3-lobed, with palate area at base bearing clavate hairs with multicellular bases. Stamens 4; posterior pair arising at top of corolla tube, included, with filaments short, filiform; anterior pair arising in throat of tube, with filaments geniculate at base (sometimes obscurely so), with a small lateral appendage, then arched and connivent under upper lip; anthers usually cohering in pairs, bithecate; thecae divaricate; staminodes 0. Nectary 0. Ovary bilocular, elliptical; ovules many; style filiform; stigma bilamellate with papillate receptive area on inner sides. Fruit an oblong capsule, +/- acute, somewhat shorter than calyx, septicidal, glabrous. Seeds small, many; testa reticulate, epidermal cells thin-walled; endosperm alveolate and longitudinally furrowed.