Geranium aculeolatum Oliv.

Perennial herb up to 9 dm. long, climbing or trailing, rooting at the nodes; stems herbaceous, longitudinally grooved, armed with sharp reflexed prickles, and with glandular hairs on the younger parts; internodes 2–15 cm. long, 1–3 mm. thick, sometimes pinkish especially the older parts.. Leaves opposite and palmately lobed; lamina 5-lobed, divided to about three-quarters of the radius; lobes 2–12 mm. wide at the base, rhombic in outline, pinnatifid, stiffly pilose on both surfaces, particularly on the veins of the lower surface;petiole 1–10 cm. long, longitudinally grooved, covered with sharp reflexed prickles and often with glandular hairs; stipules divided nearly to the base into lanceolate to linear segments, 3–8 mm. long, often glandular hairy towards the margin, margin often hyaline.. Inflorescence 2-flowered; peduncle 2–10 cm. long, grooved or terete, sometimes with prickles, usually densely glandular; pedicels 5–25 mm. long; bracts linear-lanceolate, 2–5 mm. long, hyaline along the edges, mostly stiffly pilose.. Sepals lanceolate, 7–8 mm. long, 1–4 mm. wide, mucronate, 3-nerved, hyaline at the edge, usually stiffly pilose outside but glabrous inside.. Petals broadly spathulate, 7–10 mm. long, ± 5 mm. wide, obtuse, white or pale pink to pale mauve.. Stamens: filaments narrowly lanceolate, 4–5 mm. long, scarcely hispid towards the base along the edges; anthers 0.8–1.1 mm. long, 0.5–0.7 mm. wide.. Ovary pubescent; stigmas 1.5–2.5 mm. long, slightly hispid or pubescent.. Mericarps smooth, pilose; mature rostrum 15–25 mm. long, 1–1.5 mm. wide, shortly pubescent.. Seeds 2–2.8 mm. long, 1–1.4mm. wide, glabrous; testa scarcely reticulate.