Volume 16 > Part 1 > Year 2022 > Page 126 > Annonaceae > Goniothalamus

6. Goniothalamus giganteus Hook.f. & Thomsonwfo-0000706485

Fl. Ind. 109. 1855; Miq., Fl. Ind. Bat. 1(2): 28. 1858; Hook.f. & Thomson, Fl. Brit. India 1: 74. 1872; King, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 61: 73. 1892, Ann. Roy. Bot. Gard., Calcutta 4: 93. 1893; Ridl., Fl. Malay Penins. 1: 65. 1922; Craib, Fl. Siam. 1: 50. 1925; J.Sinclair, Gard. Bull. Singapore 14: 431. 1955; Chalermglin, Fam. Annon. 160. 2001; R.M.K.Saunders, Bot. J. Linn. Soc. 139: 233. 2002; S.Gardner et al., Forest Trees S. Thailand 1: 108. 2015.— Oxymitra gigantea (Hook.f. & Thomson) Lotsy, Vortr. Bot. Stammesgesch. 3: 463. 1911. Fig. 24. Plate: XIV: B–C.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Tree to 25 m tall. Young branches hairy. Leaves papyraceous to subcoriaceous, elliptic to obovate (rarely oblong), 15.5–30 by 4.5–7.5 cm, ± glossy above, glabrous to very sparsely hairy below, glabrous above, secondary veins 14–20 pairs, ± prominent above; tertiary veins weakly percurrent, clearly distinct; petioles 4–12 mm long. Flowers solitary (rarely paired), on trunk, older branches or young growth, pedicels 20–48 mm long. Sepals 7–15 by 5–9 mm, sometimes reflexed, venation indistinct. Outer petals yellowish, 68–113 by 28–63 mm, sparsely to densely hairy abaxially, (very sparsely) hairy adaxially with glabrous basal region facing apertures between inner petals, venation indistinct. Inner petals golden brown, 15–22 by 7.5–12 mm, (very) densely hairy abaxially, glabrous adaxially. Stamens 220–570, anther connective apex truncate. Carpels 8–20, ovaries densely hairy; stigmas funnel-shaped or subulate, glabrous. Fruits without persistent sepals, pedicels 28–58 mm long. Monocarps yellowish, ellipsoid to ± moniliform, 2.4–5.1 by 1.15–2.25 cm, warty, subglabrous to sparsely hairy, yellowish, stipe 9–25 mm long. Seeds 1–2, 15–21 by 10.5–15.5 mm, smooth, hairy.

Thailand : PENINSULAR: Trang, Songkhla, Yala, Narathiwat.

Distribution : Peninsular Malaysia (type), Sumatra.

Ecology : Primary evergreen forests, often in swampy lowlands or on hillsides, commonly in sandstone areas, sea level to 900 m alt. Flowering: July–September; fruiting: April–June.

Vernacular : Panan chang (ปาหนันช้าง)(Trang).

Notes: Goniothalamus giganteus is not likely to be confused with any other species as it possesses exceptionally large, yellow flowers with wavy outer petal edges and markedly warty monocarps.