4. Cinnamomum kostermannii de Kok, sp. nov.

(Figs 2; 4)

Cinnamomum longepetiolatum Kosterm. unpublished; P.H. Hô, Illustrated. Flora of Vietnam: 429 (Hô 1991), nom. inval.; Nguyén Kim Đào, Lauraceae in Checklist of Plant Species of Vietnam 2: 77 (Nguyén Kim Đào 2003), nom. inval.; Nguyén Kim Đào, Flora of Vietnam 20: 282 (Nguyén Kim Đào 2017) nom. inval.

DIAGNOSIS. — This species differs from its close relative Cinnamomum heyneanum Wall. ex Nees by having twigs with yellowish appressed hairs (vs whitish erect hairs in C. heyneanum), terminal leaf buds that are ovoid and 2.8-3.3 mm long (vs linear and 0.8-1.9 mm long in C. heyneanum) and glabrous lower leaf surfaces (vs sparsely hairy in C. heyneanum).

TYPE SPECIMENS. — Cambodia. Stung Treng, Angleng Veng, 13°43’15.996”N, 106°7’5.988”E, 16.XI.1927, Poilane 14057 (holo-, P [P04023107]; iso-, P [P04023108]) .

VERNACULAR NAME. — Cambodian: Dang Dao (Poilane 14158).

DISTRIBUTION. — Known from Phu Quoc island in Vietnam (Nguyén Kim Đào 2017: 282) and Stung Treng province in Cambodia (Fig. 2).

ECOLOGY. — Grows in forests between 400-500 m altitude. Flowering in November; fruiting time unknown.

CONSERVATION ASSESSMENT. — Endangered (EN B1ab(i,iii), B2ab(ii,iii)). This species is known only from two localities in Cambodia and one in Vietnam. An analysis of the Extent of Occurrence (EOO) and Area of Occupancy (AOO) gives an IUCN Conservation Assessment of Endangered.

ADDITIONAL COLLECTIONS SEEN. — Cambodia. Stung Treng: Changoun, 14°24’0”N, 104°46’59.988”E, 25.XI.1927, Poilane 14158 (P [P01991864]) .

Vietnam.Phu Quoc: Kien Giang, Ban 118 (HN not seen).

DESCRIPTION

Tree 10-12 m tall, dbh c. 20 cm. Twigs slender 1.5-3 mm thick, rounded in cross-section, sparsely hairy, glabrescent; hairs yellowish, appressed; terminal leaf bud ovoid, 2.8- 3.3 mm long, apex acute, velutinous. Leaves alternate, domatia absent; blade elliptic to lanceolate, 8.5-13 × 2.8-4.6 cm, apex acuminate, base cuneate, triplinerved, secondary nerves one pair, tertiary nerves scalariform; upper surface glabrous, midrib and secondary nerves raised, tertiary nerves indistinct; lower surface glabrous, midrib and secondary nerves raised, tertiary nerves indistinct; petiole half-terete, 7-25 mm long, slightly swollen, glabrous.

Inflorescence 15-20 cm long, a few-flowered panicle, internodal; bract leaf-like; bracteoles caducous. Flowers with perianth tube shallow; perianth lobes 2.9-3.2 × 1.6- 1.7 mm, apex acute, sparsely hairy; stamens 1.3-2 mm long, hairy, anthers 4-celled; ovary globose, 1.6 mm diameter, glabrous; style c. 1.4 mm long.

Fruit unknown (see Fig. 4).

NOTES

This new name replaces the epithet Cinnamomum longepetiolatum Kosterm. which was never validly published and given that this epithet is now occupied by Cinnamomum longipetiolatum H.W. Li (1975), this species is given a new name.