Volume 16 > Part 1 > Year 2022 > Page 133 > Annonaceae > Goniothalamus

14. Goniothalamus ridleyi Kingwfo-0000706558

J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 61: 76. 1892, Ann. Roy. Bot. Gard., Calcutta 4: 98. 1893; Ridl., Fl. Malay Penins. 1: 68. 1922; J.Sinclair, Gard. Bull. Singapore 14: 437. 1955; R.M.K.Saunders, Bot. J. Linn. Soc. 139: 238. 2002; I.M.Turner et al. in Soepadmo et al., eds., Tree Fl. Sabah & Sarawak 8: 58. 2014. Fig. 27.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Tree to 20 m tall. Young branches glabrous to sparsely hairy. Leaves (thin) papyraceous, rarely subcoriaceous, (obovate-)elliptic, 14–29 by 3.5–9.5 cm, ± glossy above, glabrous to very sparsely hairy below, (sub)glabrous above, secondary veins 11–19 pairs, ± plane to slightly impressed above; tertiary venation percurrent, clearly distinct; petioles 6–16 mm long. Flowers paired in large fascicles, at base of trunk, pedicels 15–110 mm long. Sepals 9–13.5 by 6–9 mm, not reflexed, venation indistinct. Outer petals cream-yellow, 12–50 by 9–20 mm, sparsely to densely hairy abaxially, (very densely) woolly adaxially with velutinous basal region facing apertures between inner petals, venation indistinct. Inner petals cream-yellow, 11–17 by 7–9.5 mm, (very densely) hairy abaxially, velutinous adaxially. Stamens 120–320, anther connective apex short- to long-apiculate. Carpels 34–90, ovaries glabrous; stigmas funnel-shaped, glabrous. Fruits with persistent sepals, pedicels 30–130 mm long. Monocarps yellow, pink, red or purple, ellipsoid to obovoid, 1.6–3.5 by 1.3–2.9 cm, smooth, glabrous to sparsely hairy, stipe 2–15 mm long. Seeds 1–2(–3), 15–25 by 10–18 mm, smooth, (sparsely) hairy.

Thailand : PENINSULAR: Narathiwat.

Distribution : Peninsular Malaysia (type), Singapore, Sumatra.

Ecology : Primary swamp forests and lowland and submontane rain forests, on hillsides, often by streams, 50–1,000 m alt. Flowering and fruiting throughout the year.

Vernacular : Panan pum rak (ปาหนันปุ่มราก)(Narathiwat).

Notes: Goniothalamus ridleyi is the only Thai representative of a species group characterized by flowers and fruits that are borne on very long pedicels, developing exclusively from woody tubercles at the base of the trunk, close to soil level. The flowers are furthermore often borne erect (rather than pendent as in most other Goniothalamus species), and there is therefore little possibility of misidentification if fertile material is available.