Alangium kayuniga K.M.Wong

Dewilde, W. J. J. O. & Duyfjes, B. E. E., 2017, Taxonomy of Alangium section Conostigma (Alangiaceae), Blumea 62 (1), pp. 29-46 : 35

8. Alangium kayuniga K.M.Wong — Fig. 3

Alangium kayuniga K.M.Wong (in Wong & Low 2015) 69,f. 1. — Type: Yusop BRUN 22161 (holo BRUN;iso SING), Brunei, Belait, Sungai Liang, Andulau Forest Reserve , 21 Mar. 2007, fr.

Tree 10–15(–25) m tall; twigs pale brown, c. 2 mm diam, glabrous (only when young very densely short-hairy); leaf bud densely short-hairy (hairs less than 0.1 mm long). Leaves: petiole 0.4–1.5 cm long; lamina drying (greenish brown), glabrous, elliptic, 5–15 by 4–5.5 cm, base (slightly) asymmetric, cuneate, apex acute-acuminate; veins pinnate, 7–9 on each side; tertiary venation thin, reticulate. Inflorescences minutely hairy, of 1 main branch (peduncle) from the leaf axil, not or hardly branched, 1- or 2- (or 3-?)flowered; peduncle c. 4 mm long. Flowers minutely hairy; pedicel c. 2 mm long; corolla in bud 8–11 mm long, base not swollen, apex blunt or subacute; ovary and calyx c. 4 mm long, slightly ribbed; limb c. 1 mm long, at margin c. 4 mm wide, truncate, not lobed; petals 4, inside glabrous, c. 11 mm long; stamens 4, filament 3–4 mm long, densely very fine hairy towards apex, somewhat broadened, anther c. 7 mm long, connective glabrous; style densely appressed short-hairy (except for the basal 2 mm), c. 6 mm long, stigma conical. Fruit 1 (or 2?) per infructescence, ripening reddish purple, glabrous, broadly ellipsoid, 18–22 by 12–16 mm, shallowly ribbed or not ribbed; calyx remnant small.

Distribution — Borneo ( Brunei, Sarawak, Sabah).

Habitat & Ecology — Hill ridge in forest intermediate between heath and dipterocarp type, mixed dipterocarp forest, forest on steep slopes; shallow shales, yellow clay with big sandstone rocks; 50–900 m altitude; flowering in June and October; fruiting in March to April and August to October.

Field-notes — Fruit reddish with yellow spots and fruits black with juicy skin.

Vernacular names — Mediong, Midong (Iban).

Additional specimens studied. SARAWAK, Luang S 23684 , 3rd Div., Bukit Iju, Ulu Arip,balingian, 60 m alt., 1 Aug.1965, fr.; Hou 403, 4th Div., Nyabau, Bintulu, 200 m alt., 26 June 1966, fl.; Julaihi, Rantia et al. S 76956, 4th Div., Gunung Pelamau, Sungai Tutoh, Ulu Baram, Miri, 800 m alt., 15 Apr. 1997, fr.; Yii & Asah S 64913 , 4th Div., Bukit Kana, Ulu Sungai Sangan, Tatau, Bintulu, 700 m alt., 6 Oct. 1994, fl.; Yii S 53525 , 7th Div., Bukit Tasu, Ulu Sungai Penuan, Batang Balui, 850 m, 14 Mar. 1987, fr. – SABAH, Wood & Wyatt-Smith A 4388, Tenom,Bukit Tenom, 275 m alt., 3 Sept.1954,fr.; Meijer SAN 121372, Tenom, 800–900 m alt., 17 Oct. 1987, fr.; Wong & Donggop WKM 2286, Tongod, Sungai Imbak, 335 m alt., 29 Aug. 1992, fr.

Note — The flowers of A. kayuniga are herewith described for the first time ( Yii & Asah S 64913 ; Hou 403). The species is close to A. meyeri var. macilentum , which differs mainly in the presence of a minute but distinct indument. In the cited collections the red-brown calyx limb contrasts with the yellowish ovary and corolla in bud.

Figures

Fig. 3 Alangium kayuniga K.M.Wong. a. Flowering twig; b. inflorescence; c. mature flower bud; d. ditto, opened, some petals and stamens removed; e, e' stamen, inside and outside, respectively; f. fruiting twig; g. fruit (a‒e': Yii & Asah S 64913; f –g: Sibat ak Luang 23684, all L). —Drawn by Jan van Os.