A deciduous geophyte with a small subterranean tuber, 70-200 mm tall when in flower. Tuber: a turnip-shaped or elongated root with a short flattened stem, covered with flaking dark brown periderms, 20-60 mm long and 15-20 mm in diameter. Leaves radical, green, petiolate; lamina broadly ovate, base cuneate, apex rounded, 15-60 x 10-45 mm, pinnately compound, irregularly pinnatilobed to bipinnatisect, densely pilose with white patent hairs interspersed with glandular hairs; segments linear, 5-10 mm long, 2-6 mm wide, apices obtuse; petiole 10-60 mm long and 1-3 mm in diameter, erecto-patent, indumentum as on lamina; stipules subulate, adnate to petioles for one third of their length. 3-7 mm long and ±1 mm wide, hirsute. Inflorescence: scape 10-30 mm long, 2-5 mm in diameter, branched, bearing 2-5 pseudo-umbel lets with 10-30 flowers each; peduncles wine-red to brown-red, 30-170 mm long, 1-2.5 mm in diameter, pilose with glandular hairs interspersed; bracts green, erect, subulate, 3-6 mm long, 1 mm wide, abaxially hirsute; flower buds, flowers and fruits erect. Pedicel ±0.5 mm long, green. Hypanthium 14-32 mm long, 4.6-6 times the length of the sepals, wine-red to brown-red, covered with glandular hairs interspersed with non-glandular hairs. Sepals 5, lanceolate, apices acute, 4.5-6 mm long, 1-2 mm wide, reflexed, green, indumentum abaxially as on hypanthium. Petals 5, white, cream-coloured or yellow with red or crimson markings in the centre, patent during anthesis; posterior two unguiculate-spathulate to unguiculate-obcordate, bases cuneate. apices rounded to emarginate, 9-16 x 2.5-1.5 mm, length/ width ratio 2-4; anterior three spathulate, bases attenuate, apices rounded, 5.5-13 x 1.5-4 mm. Stamens 10, basally connate, staminal column 1.5-3 mm long, white, smooth; perfect stamens 2 (anterior position), white, 5-9 mm long, 1-1.6 times the length of the sepals, protruding from the flower; staminodes 2-6.5 mm long; anthers pale pink, ±1 mm long, pollen yellow. Gynoecium: ovary superior, oblong-conical, 5-lobed, 2.5-4.5 mm long, densely sericeous interspersed with glandular hairs; style filiform, 1.5-4.5 mm long, pink; stigma with 5 branches, 0.5 mm long, pink. Fruit: a schizocarp consisting of 5 mericarps, bases of mericarps 4-5 mm long, without glandular hairs, tails 22-30 mm long. P. rubiginosum flowers from October to November.
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Tuberous geophyte, up to 200 mm tall. Leaves dry at flowering, bipinnatisect, up to ± 100 mm long, densely covered with white hairs. Flowers in 2-5 clusters on a branched peduncle, 10-30 in each, subsessile, petals 5, white to yellow, with red central markings, 9-16 mm long, hypanthium 14-32 mm long.
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