Alangium strigosum W.J.de Wilde & Duyfjes, 2017

de Wilde, W. J. J. O. & Duyfjes, B. E. E., 2017, The species of Alangium section Rhytidandra (Alangiaceae), Blumea 62 (1), pp. 75-83 : 81

9. Alangium strigosum W.J.de Wilde & Duyfjes , nom. nov.

Iodes ferruginea Lauterb.& K.Schum. in Schumann & Lauterbach (1900) 418 (see note 1). ― Type: Lauterbach 2387 (see note 2) (holo B†, lectotype here designated: WRSL; iso G-BOISS n.v., K K000704816 , L L0009827 ), Papua New Guinea,Kaiser Wilhelmsland,Schumann Fluss, Lager II, 250 m alt., 20 June 1896, fr.

Tree c. 10 m tall; twigs brown, 2‒3.5(‒6) mm diam, densely rusty or golden brown-hairy, hairs 0.5‒1 mm long. Leaves: petiole 0.5‒1 cm long, hairy; lamina drying greenish, soft pale hairy below (glabrescent above), hairs 0.1‒0.5 mm long, elliptic, 13‒19 by 4‒9 cm, base asymmetric, cuneate, apex acute-acuminate; veins pinnate, 4‒5(‒7) at each side, tertiary venation widereticulate. Inflorescences hairy (hairs less than 0.5 mm long), simple, 5‒10-flowered, peduncle 8‒10 mm long. Flowers (only immature buds known) densely golden or greyish brown-hairy; pedicel c. 2 mm long; corolla in bud presumably c. 10 mm long, c. 1.5 mm diam, base not swollen, apex obtuse; ovary and calyx limb c. 4 mm long, not ribbed, yellowish or greyish brown-hairy, limb c. 1 mm long, with lobes nearly 1 mm long, not spreading; petals 5, inside glabrous; stamens 5, filament c. 2 mm long, thinly hairy, anther c. 3 mm long, connective glabrous; style glabrous but hairy towards and on stigma lobes. Fruit c. 2 per infructescence, ripening red, glabrescent, ellipsoid, 12‒15 by c. 10 mm, not ribbed, apex not narrowed; calyx remnant small, narrow, consisting of 4 (or 5) strigose connivent lobes c. 1 mm long.

Distribution ― Papua New Guinea (Madang and Sepik Provinces).

Habitat & Ecology ― Rain forest, low hilly terrain; clay and marl; 50‒250 m altitude; flowering in October; fruiting in June.

Notes ― 1. Alangium strigosum needed a new name, because it was previously described as Iodes ferruginea (in Icacinaceae ) which cannot be combined in Alangium because of A. ferrugineum .

2. The lectotype, in WRSL, bears the number Lauterbach 387, but in the protologue the number is changed into Lauterbach 2387, presumably the number 2 is added to indicate that the collection was from ‘Lager’ = camp 2 .

3. Alangium strigosum resembles A. velutinum , the latter is a montane species distinct in conspicuous dense red-brown indument.

4. The species is known from two collections: the type and Pullen 1810 ( L), from Sepik Prov., Wewak-Angoram Area , c. 50 m alt., 1 Oct. 1959, fl .