Compilation
Pelargonium rehmannii

Erect perennial herb up to 70 cm. tall, with a tuberous woody rootstock; acaulescent; vegetative parts, peduncles and pedicels glandular and pubescent, covered with both long (± 4 mm.) patent and much shorter ± appressed hairs, as well as sessile glands. Leaves all radical; lamina (3) 7–15 (24) × (4) 7–14 (19) cm., ovate to broadly ovate, base cuneate to cordate, extremely variously dissected, shallowly lobed to pinnatisect or bipinnatisect, later leaves often more dissected; ultimate segments filiform (in the Transvaal) to oblong or ovate, entire to serrate or crenate towards the apex, when entire apex acute to rounded or mucronate, densely tomentose (in the Transvaal on specimens with undivided leaves) to ± glabrous, with the long patent hairs absent or sparse on many leaves and always restricted to the margin and veins; petiole (6) 8–20 (30) cm. long; stipules 15–40 × 1·5–4 (5) mm., linear to narrowly triangular, acuminate. Inflorescence a terminal pseudumbel of (5) 7–30 (50) flowers; peduncles 1–3, 14–65 cm. long, unbranched; bracts (8) 11–13 (16) × 1·5–3 (4) mm., few to numerous, linear to lorate or lanceolate, acuminate, membranous; free part of pedicel 2–35 (50) mm. long. Spur 30–60 (70) mm. long. Sepals (8·5) 9–12 (15) × (1·5) 2–4 (5) mm., lanceolate to narrowly ovate, glandular and densely pubescent. Petals 5, white to pale yellow with pink venation, or to pink (or dark red in southern Mozambique and Angola), (12) 14–24 (28) × 5–12 mm.; oblanceolate to narrowly obovate, the three anterior ones unguiculate. Stamens with fertile filaments usually 7, (4) 5–7 (8) mm. long, sterile filaments (staminodes) 3, 3–5·5 mm. long, all 10 connate at the base for 1·8–3·5 mm.; anthers 1·6–2·8 (3·2) × 1·2–1·7 mm. Ovary with basal part tomentose; rostrum pubescent; style 0·1–1·2 mm. long; stigma 1·6–2·8 mm. long. Fruit 4–5 (6·5) cm. long; cocci 9–15 × 1·5–3 mm. Seeds 4·8–6 × 1·9–2·2 mm., pale brown, minutely reticulate (at × 50).