Cinnadenia malayana Kosterm.

De Kok, Rogier P. J. & Sengun, Seda, 2020, A revision of Cinnadenia Kosterm. (Lauraceae), Adansonia 42 (4), pp. 105-112 : 108

2. Cinnadenia malayana Kosterm.

Adansonia, sér. 2, 17: 90 (1977); Kochummen, Tree Flora of Malesia 4: 123 (1989).

— Type: Peninsular Malaysia, Negeri Sembilan, Pedas , Gunung Angsi , 16.II.1971, Zainuddin bin Sohadi, FRI 14593 (holo-, L [ L0035682 ; Fig. 3 ]; iso-, KEP [ KEP168419 ]).

DISTRIBUTION. — Endemic to Peninsular Malaysia: Selangor, Negeri Sembilan and Johor.

ECOLOGY. — Growing in hill forests between 60-1000 m altitude. Flowering from February to April; fruiting unknown.

CONSERVATION ASSESSMENT. — Endangered (EN B1ab(i,iii), B2ab(ii,iii)). This species is known only from few collections from three locations in central Peninsular Malaysia, where it is reported to be locally abundant. An analysis of the Extent of Occurrence (EOO) gives an IUCN Conservation Assessment of Vulnerable, but the Area of Occupancy (AOO) suggests an assessment of Endangered. Given the small area of occupancy and the intensive logging and landscape modification that has occurred in the region during the last 50 years, this species must be considered endangered.

ADDITIONAL SPECIMENS SEEN. — Peninsular Malaysia: Selangor: Semangkok Forest Reserves, 10.II.1972, T. Suppiah FRI 14930 (KEP); Semangkok Forest Reserves, Kompt. 8, 10.IV.1972, Baharudin Alias KEP 120202 ( KEP) ; Semangkok Forest Reserves, Kompt. 8, 10.IV.1972, Baharudin Alias KEP 120203 ( KEP) ; Semangkok Forest Reserves, Kompt. 8, 11.IV.1972, Baharudin Alias KEP 120204 ( KEP) ; Johor: Mersimg, Tenggaroh Forest Reserves, Kompt. 101, 7.IV.1968, K. Ogata KEP 105193 ( L, KEP) .

DESCRIPTION

Tree, 7-25 m tall, DBH 10-25 cm. Bark yellowish brown to yellowish grey, smooth. Twigs slender, 1.8-2.7 mm thick, rounded to slightly angular in cross-section, glabrous; terminal leaf buds ovate to lanceolate, c. 2.8 mm long, glabrous. Leaves alternate; leaf blade lanceolate, 9.7-19.5 × 3.5-6.9 cm, apex acuminate, base cuneate to slightly rounded, sometimes asymmetric, leathery, pinninerved, secondary nerves 6-15 pairs, tertiary nerves reticulate; upper surface glabrous, midrib and secondary nerves slightly raised, secondary and tertiary nerves inconspicuous; lower surface glabrous, midrib and secondary nerves raised, tertiary nerves faintly visible; petiole channelled 8.9-16.3 mm long, glabrous, wrinkled and slightly swollen. Inflorescence axillary, paniculate, involucral bracts absent, female panicles few flowered 1.5-2.6 cm long, male panicles 2.5-14.3 cm glabrous; bracteoles unknown, caducous. Flowers unisexual, white to yellow; tepals in two rows of two, glabrous with a few hairs inside at the base or along the spine or at the margins; perianth lobes 3-3.3 × 1.5-4 mm, apex rounded; stamen number variable per flower, 18-26 per flower (reported up to 32), 1.4-2.6 mm long, sparsely hairy; ovary globose, 0.6-0.7 mm in diameter, glabrous; style c. 0.2 mm long; stigma inconspicuous. Fruit unknown.

Figures

FIG. 3. — Holotype of Cinnadenia malayana Kosterm. (L0035682).