Volume 16 > Part 1 > Year 2022 > Page 14 > Annonaceae > Alphonsea

3. Alphonsea curtisii Kingwfo-0000527338

J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 61: 127. 1892; Ridl., Fl. Malay Penins. 1: 99. 1922; J.Sinclair, Gard. Bull. Singapore 14: 389. 1955; Kochummen in Whitmore, Tree Fl. Malaya 1: 67. 1972; Kessler, Bot. Jahrb. Syst. 118: 87. 1995; S.Gardner et al., Forest Trees S. Thailand 1: 91. 2015. Plate I: A.

Accepted Name : This is currently accepted.

Description : Tree 14–20 m tall; bark greyish brown to brown, longitudinally striate. Twigs densely covered with brown appressed hairs when young, later sparsely hairy to glabrous. Leaves coriaceous, lanceolate, oblong-lanceolate or elliptic-lanceolate, 10–22 by 1.5–6.5 cm, base cuneate, apex acute or acuminate, the acumen 2–10 mm long, margins revolute, glabrous above, glabrous or sparsely brown appressed hairy, more densely on midrib below, midrib plane above, secondary veins 8–15 per side, tertiary venation on lower surface forming a close network; petioles (2–)5–13 mm long. Inflorescences 1–3-flowered, peduncle 1–3 mm long, pedicels 5–10 mm long, each bearing a single bract at the midpoint; buds conical. Sepals connate at base, ovate, 1–3 mm long, obtuse. Outer petals yellow, triangular ovate or ovate, 10–13 by 7.5–10 mm, apex obtuse, densely hairy on both sides. Inner petals yellow, triangular-ovate, 10–14 by 7–9 mm, apex obtuse to acute, hairy outside, glabrous or distally hairy inside. Stamens 30–40, oblong, 1–1.5 mm long. Carpels 2–3, ovaries oblong or oblong-elliptic, 3–5 mm long. Fruit of 1–3 monocarps borne on a pedicel 10–15 mm long. Monocarps ellipsoid or ovoid-ellipsoid, 4.5–7 by 3–4.5 cm, smooth, densely hairy, apex rounded, base subsessile or contracted into a stipe 3–5 mm long. Seeds 4–7 per monocarp, ellipsoid, 20–28 by 10–15 mm.

Thailand : PENINSULAR: Surat Thani (Khlong Saeng WS), Satun (Tarutao), Songkhla (Khao Nam Khang NP), Narathiwat (Ba Cho)

Distribution : Peninsular Malaysia (type).

Ecology : Occurs in disturbed areas in lowland evergreen forests and shaded areas on limestone bedrock in evergreen rain forests, 125–180 m alt. Flowering: February–April; fruiting: February.

Vernacular : Tam yao (ตำหยาว), sang yu (สังหยู)(Narathiwat).

Notes: Alphonsea curtisii is distinguished by the combination of lanceolate, oblong-lanceolate or elliptic-lanceolate leaf shape, the 2–3-carpellate gynoecium, and the smooth monocarps that are subsessile or have a stipe 3–5 mm long.