Herb, (4-)10-60 cm tall, occasionally branched, larger plants robust. Stems and branches 0.05-0.2 cm in diam.; internodes 1-4.5 cm long, same length or shorter at base. Leaves 1/3 to 2 times longer than length of internodes; blade glaucous, narrowly ovate to ovate, lower leaves slightly broader, (0.5-)1-4 x 0.2-1.1 cm, apex acute to slightly obtuse (lower leaves), primary vein and sometimes secondary veins distinct. Inflorescence usually terminal, 1-10-flowered modified dichasia; bracts (12-)20-30 mm long, as long as or longer than upper leaves, bracteoles (8-)10-25 mm long; pedicels 2-51 mm long. Flowers erect to slightly nodding, upper ones sometimes subsessile; calyx green, 8-22 mm long, distinctly 4-winged, connation 1/2-2/3 of its length, lobes narrowly triangular, 5-10 x 1-4 mm, longer than corolla tube, margin entire, membranous, apex acuminate, wings 1-3 mm broad, wing venation prominent, usually densely reticulate, rarely transverse; corolla yellow to brownish red or purple, lobes lighter, throat brown, salver-to funnel-shaped, 12-27 mm long, connation 1/2-2/3 of its length, lobes round to broadly obovate, 4-9(-10) x 3-7(-9) mm, margin entire, slightly undulating, apex broadly rounded, acuminate; stamens ca. as long as corolla tube, 9-15 mm long, longest ones ca. as long as style+stigma, subequal or 2 long 2 short, inserted on corolla tube at 1/3 from base, filaments white, 5-9(-10) mm long, straight, with 2 broad dentate appendages at base, 1/3 to 1/2 of length of filament, anthers yellow, (narrowly) ellipsoid to narrowly oblong, (1.5-)3.5-5 mm long; pistil 16-20 mm long, ovary narrowly ovoid to ovoid, 5-12 x (2.5-)4-6 mm, disk-like ring absent, style 6-13 mm long, white, exserted from corolla tube, stigma yellow, lobes very broadly ovate, 1-2.5 mm long. Fruit ellipsoid-ovoid, 6-13 mm long; calyx and usually corolla persistent, calyx wings 3-5 mm broad in fruit.
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Herb, 5-35 cm tall; stems erect, unbranched or sparsely branched, the branches strongly ascending, 4-angular, slightly winged. Leaves uniformly distributed along the stem; the lamina of the basal leaves ovate, the upper ones narrowly ovate to linear, 0.8-4.7 cm long and 2-8 mm broad, acute to subobtuse at the apex, attenuate to amplexicaul at the base, the lateral veins 1-3, the veins basally connate, inconspicuous, thin-chartaceous. Inflorescences in the upper axils and terminal, borne singly or in simple or compound, few-flowered dichasia; the pedicels to 4 mm long (flowers usually sessile to subsessile); the bracts foliose, narrowly ovate to linear, to 22 mm long and to 4 mm broad. Flowers 1.6-2.6 cm long, dull pale to dirty pink; calyx 1.2-2.2 cm long, urceolate, winged, the wing (1.5-)2-3 mm broad, the densely reticulate veins conspicuous, the lobes narrowly ovate, long-attenuate at the apex, 6-10 mm long; corolla 1.6-2.6 cm long, infundibular, the throat constricted below, the lobes obovate to subspathu-late, rounded to subacute at the apex, 6-8 mm long, covered with numerous, minute, dark purple spots; stamens included, 13.5-16 mm long, inserted basally on the corolla tube, the filaments 12-14 mm long, the anthers 1.5-2 mm long, bilobate at the base with an inconspicuous mucro; pistil exserted, the ovary fusiform, 8-10 mm long, the style 7-9 mm long, the stigma lobes discoid, ca. 2 mm in diameter. Capsule fusiform, 12-14 mm long; seeds irregular, ca. 0.5 mm long.
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