Piaranthus parvulus N.E.Br.

Stems 15-50(-90) mm long, 10-20 mm thick, subglobose, green to dark grey-green, smooth; tubercles with apical deltoid leaf-rudiment 0.5-1.0 mm long. Inflorescences bearing 1-10 flowers opening in ± rapid succession on gradually lengthening peduncle up to 15 mm long; pedicel 4-25 mm long, ±1 mm thick; sepals 1-2 mm long, 1 mm broad at base. Corolla 6-13 mm diam., ± campanulate to rotate; inside pale to bright yellow sometimes faintly spotted or transversely barred with red-brown, covered with fine papillae (<0.2 mm long); tube ± absent; lobes 3-7 mm long, 1.8-2.2(-3.0) mm broad at base, ascending often with recurved tips, lanceolate, acute, with margins slightly recurved, eciliate. Corona 2.0-3.2 mm tall, 2.0-3.5 mm broad, yellow; outer lobes forming narrow platform beneath guide-rails and rounded-verrucose to tuberculate ascending to spreading crest ±1 mm wide behind inner lobes; inner lobes 1.0-1.8 mm long, 0.3-0.6 mm broad, adpressed to backs of anthers for lower half of anthers then erect and often with recurved apices, subulate to narrowly deltoid to linear, acute to obtuse or truncate-emarginate, margins sometimes folded back so that channelled above.