Plants perennial; taproot stout; caudex branched, woody. Stems several-many, ascending from decumbent base, usually un-branched, slender, 10-40(-70) cm, with short, fine, dense, retrorse or curled grayish white hairs, rarely subglabrous, typically not glandular but occasionally somewhat glandular distally. Leaves 2 per node, finely retrorse; blade with no visible lateral veins, midrib distinct, oblanceolate, elliptic to linear, 2-10 cm × 1.5-13 mm, apex acute, puberulent to glabrous; basal leaves numerous, blade spatulate; cauline in 1-8 pairs, distal ones sessile. Inflorescences typically cymose, occasionally with reduced lateral cymes, 1-or 3-flowered, open, bracteate, grayish white retrorse-puberulent, typically not glandular, rarely with few stipitate glands; bracts narrowly lanceolate, 2-10 × 0.5-2 mm, herbaceous, puberulent. Pedicels ascending, straight, 0.5-4 cm. Flowers: calyx green, sometimes suffused with purple, prominently 10-veined, tubular in flower, campanulate and ± inflated in fruit, occasionally somewhat constricted near base, 12-15 × 3-10 mm, papery, grayish white retrorse-puberulent and eglandular, often ciliate, rarely glabrous or with few stipitate glands, veins parallel, green, forked and connate between lobes, lobes 5, erect, ovate-triangular, 2-3 mm, margins membranous, apex blunt; corolla creamy white, often greenish and occasionally tinged with dark pink, clawed, to 2 times calyx, claw slightly longer than calyx, limb obovate-lanceolate, deeply 2-lobed, 4-11 mm, lobes oblong, rounded, margins entire to erose, appendages 1-2(-3) mm; stamens equaling corolla claw; styles 3-5, 1-11/ 2 times corolla claw. Capsules ovoid-ellipsoid, 11/ 3 times calyx, opening by 3-5 ascending to spreading teeth; carpophore 3-4 mm. Seeds rusty brown, broadly reniform, sides flat, 1.2-1.5 mm, margins coarsely papillate, verrucate-tuberculate.
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