Dwarf shrublet, rarely branching from base, with 1-5 stems. Stems 30-200 mm long, 20-60 mm thick, erect, cylindrical clavate or ± spherical, whitish to grey-green; tubercles flattened rounded polygonal, crowded but arranged into ±12-16 rows along stem, each tipped with small conical to flattened leaf-rudiment <1 mm long. Inflorescences mainly near apex of stem, flowers arising in groups of 1-5, developing successively; pedicel 0.5-1.5 mm long, 1.0 mm thick; sepals 2 mm long, 1 mm broad at base, lanceolate-ovate, acute, keeled towards apex, glabrous. Corolla 8-16 mm diam., shallowly campanulate; inside with purple to red spots on white to pale yellow background and usually with purple-brown patch on apex of lobes, covered with dome-shaped papillae each with or without short apical bristle; tube ±2 mm deep, cupular, pentagonal with inward-pointing bulges opposite anthers; lobes 2-3 mm long, 3-5 mm broad at base, spreading with strongly reflexed tips, ovate-deltate, acute, margins slightly recurved. Corona ±2.5 mm tall, 5-6 mm broad, whitish spotted with purple-black, raised on very short stipe; outer lobes 1.5-2.5 mm long, spreading, bifid almost to base into widely divergent spreading slightly dorsiventrally flattened lobules, laterally fused near base to bases of inner lobes into shallow pouch; inner lobes 2.0-2.5 mm long, adpressed to backs of anthers and exceeding them then connivent-erect and rising into column in centre, linear, obtuse, with spreading narrowly conical dorsal projection ±1.5 mm long near base arising inside but confluent with outer lobes.
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Like L. cactiformis but corolla spotted with red on yellow, tube distinctly pentagonal, inner corona lobes exceeding anthers and rising in a column in centre.