Pachycarpus concolor E.Mey.

Apocynaceae (part 2), David Goyder, Timothy Harris, Siro Masinde, Ulrich Meve, Johan Venter. Flora of Tropical East Africa, 2012

Morphology General Habit

Perennial herb with annual stems arising from a stout, cylindrical, vertical tuber.

Morphology Stem

Stems procumbent to erect even in the same population, 0.2–1 m long, one to several, usually unbranched but sometimes branched below, densely pubescent with spreading white or rusty hairs

Morphology Leaves

Leaves spreading, petiole 1–10 mm long, pubescent; lamina linear to narrowly lanceolate or triangular [or lanceolate to ovate outside FTEA area], 5–16 × 0.6–4 cm, widest at or just above the base then tapering gradually into the acute or subacute apex, base shortly cuneate or truncate, margins scabrid, plane or crisped, slightly scabrid with spreading white or rusty hairs on both upper and lower surfaces

Morphology Reproductive morphology Inflorescences

Inflorescences terminal and extra-axillary with (1–)2–7 scented flowers in an erect umbel, sessile or with peduncles to 3 cm long, densely spreadingpubescent.

Morphology Reproductive morphology Inflorescences Bracts

Bracts filiform, 4–14 mm long, pubescent.

Morphology Reproductive morphology Flowers Pedicel

Pedicels 1–3 cm long, pubescent Fruiting pedicel contorted to hold follicle erect.

Morphology Reproductive morphology Flowers Calyx

Calyx lobes subequal to strongly unequal, longest ovate to lanceolate, 12–16 × 4–8 mm, acute, pubescent, sometimes reddish towards tip

Morphology Reproductive morphology Flowers Corolla

Corolla rotate or broadly campanulate, underside tinged reddish brown, densely pubescent, upper surface white, cream or pale green, with or without purple markings, glabrous or minutely papillate; lobes broadly ovate, 11–15(–18) × 8–13 mm, subacute

Morphology Reproductive morphology Flowers Corona

Corona lobes dorsiventrally flattened, arising from the base of the staminal column; basal part spreading, rhomboid or continuous with the distal part, ± 3 × 3–6 mm, with an erect pair of pyramidal or deltoid obtuse teeth 2–3.5(–4.5) × 1.5–3.5 mm arising from the middle of this part and reaching ± the top of the staminal column; distal part lingulate or slightly spatulate, 4–9(–15) × 1.5–2.5 mm, rounded or truncate, erect or incurved over the head of the staminal column, glabrous except for a minutely but densely papillate central strip on upper side, entire lobe white or cream, or dull purple at the base with a green tongue

Morphology Reproductive morphology Flowers Androecium Stamens

Staminal column truncate-conical, 3–4 × 7–8(–9) mm.

Morphology Reproductive morphology Flowers Androecium Stamens Anthers

Anther wings triangular, 3–4 × 1.5–3 mm, appendages broadly ovate, 1.5–2.5 × 1.5–2.5 mm, acute and inflexed over apex of stylar head; corpusculum black, broadly ovoid or ovoid-conical, 0.8 × 0.4–0.6 mm; translator arms 0.8–1 mm long, flattened, ± triangular and weakly geniculate, 0.4 mm wide at attachment to pollinia and with a clasping overlap of ± 0.2 mm with the pollinium on the ventral face.

Morphology Reproductive morphology Flowers Pollinia

Pollinia elliptic in outline, 1.2–1.8 × 0.7–0.8 mm, somewhat flattened

Morphology Reproductive morphology Flowers Gynoecium Style

Stylar head flat

Morphology Reproductive morphology Fruits

Follicle fusiform, to 12 × 3 cm, not generally inflated, with 6 narrow longitudinal wings or ridges in the upper half, minutely pubescent.

Morphology Reproductive morphology Seeds

Seeds ovate, 5 × 3 mm, and slightly convex on both faces, pubescent, disc not clearly differentiated from rim; rim with transverse ridges; coma ± 4 cm long.

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation

Predicted extinction risk: not threatened. Confidence: confident