Volume 7 > Part 1 > Year 1999 > Page 141 > Apocynaceae > Aganonerion

Aganonerion polymorphum Pierre ex Spirewfo-0000896264

Apocyn. I.-C. 43. 1905; Pitard, Fl. Gén. I.-C. 3: 1226. 1933; Kerr, FI. Siam. En. 2: 470, 1939; Lý, Fedd. Rep. 97: 668. 1986; Middleton, Blumea 41: 73. 1996. Fig. 45.

Accepted Name : Urceola polymorpha (Pierre ex Spire) D.J.Middleton & Livsh.
Taxon 67: 356. 2018.

Description : Branches puberulent when young; older branches sparsely lenticellate or not. Leaves: petiole 0.6–3.2 cm long; blade papery, elliptic to ovate, 2.1–11.3 x 1–4.6 cm, apex acuminate to obtuse, base cuneate to cordate; secondary veins 3–6 pairs; pubescent on the underside in the axils of the secondary veins. Inflorescence 3–9 cm long; puberulent; many flowered; bracts narrowly ovate and early deciduous. Sepals ovate, 1.8–3.5 x 0.9–1.5 mm, apex acute or acuminate; puberulent to glabrous, usually minutely ciliate. Corolla pale yellowish, pinkish or red; tube 3.5–5.2 mm long; lobes 1.5–2.5 mm long; sparsely puberulent to almost glabrous outside, pubescent in mouth and sparsely so lower down inside. Stamens with anthers 3.2–4.2 x 0.6–0.7 mm. Disk shorter than the ovary. Ovary 0.9–1.1 mm long; style + pistil head 2 mm long. Fruit 5.5–21 cm long, 4–6 mm wide; glabrous. Seeds brown or white hirsute; elliptic; 10–10.2 x 1.7–3.2 mm; coma 1.5–3.3 cm long.

Thailand : NORTH-EASTERN: Phetchabun, Loei, Udon Thani, Sakon Nakhon, Nakhon Phanom, Khon Kaen; EASTERN: Chaiyaphum, Nakhon Ratchasima, Buri Ram, Si Sa Ket, Ubon Ratchathani.

Distribution : Vietnam (type), Cambodia, Laos.

Ecology : In deciduous or partly evergreen forests to 700 m alt.

Vernacular : Som lom (ส้มลม)(Northeastern).

Uses: Fruit edible.