Perennial herb, taproot eventually thick and woody, crown without a tight cluster of vegetative buds. Stems several from the crown, simple or sparingly branched, usually erect, rarely decumbent, 150-300 mm long, clad in retrorse white hairs, dwarf leafy axillary shoots often present. Radical leaves rarely present and then very loosely tufted, they and sometimes the lowermost leaves c. 15-46 x 24(-10) mm, elliptic tapering to a broad petiolar part, usually with a few small obscure callose teeth near tip; cauline leaves mostly 20-40 x 1-2 mm, more or less spreading, linear, base slightly broadened, clasping, apex ± obtuse, margins entire or with a few small callose teeth near tip, thinly hairy on both surfaces. Flowers opening at dusk or in dull light, but twice recorded as open in bright light, mostly 10-25, fewer on weak branches, arranged in a spike, usually elongating in fruit. Bracts unlike the leaves, adnate to calyx for 24 mm, c. 15-27 mm long, lanceolate-acuminate, margins usually entire, or occasionally with a few callose teeth near apex, hairy on margins and midline, occasionally hairy all over backs. Calyx 8-10 mm long, lips 3-4 mm long, hairy at least on margins and keels. Corolla tube 25-39 mm long, glandular-puberulous, hairs c. 0.1 mm, limb held horizontally, regular; mouth with circlet of long unicellular hairs; lobes 3-5 mm long, deeply notched, red and glandular-puberulous outside, white inside, eglandular. Stamens 4, anticous anthers 1.5-2 mm long, shortly exserted, posticous ones 2.5-3 mm long, included. Stigma 5-10 mm long, exserted. Capsules c. 9 x 5 mm. Seeds c. 1 x 0.7 mm, angled, colliculate, pallid.
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Perennial herb, up to 0.3 m high. Stems mostly erect, several, not or little branched, lacking group of vegetative buds on crown, leafy, leaf tufts axillary; clad in retrorse white hairs. Leaves ± spreading; radical ones with blade linear to elliptic, 15-46 x 2-4 mm, cauline ones with blade linear, 20-40 x 1-2 mm, base slightly broadened, clasping, apex obtuse, margins entire or with a few callose teeth near apex, hairy. Flowers: up to 25 in a spike, often elongating in fruit; bracts adnate to calyx; corolla tube up to 25-39 mm long, limb regular, held ± horizontal, mouth encircled by long hairs, lobes eglandular, 3-5 mm long, deeply notched; red outside, white inside; Jan.-Mar., opening at dusk or dull light.
Perennial herb, up to 300 mm high; mostly erect, several-stemmed, not or little branched, lacking group of vegetative buds on crown, leafy, leaf tufts axillary. Leaves: radical ones rare, together with lowest cauline ones petiolate, ± spreading, linear to elliptic and somewhat hairy. Flowers rarely seen opening in strong light; up to 25 in a spike, often elongating in fruit. Corolla: tube up to 39 mm long; limb regular; mouth encircled by long hairs; lobes eglandular. Flowering time Jan.-Mar.