Chiloschista sweelimii Holttum (1966: 147)

Averyanov, Leonid V., Thai, Tran Huy, Truong, Ba Vuong, Nguyen, Van Canh, Nguyen, Tuan Hoang, Maisak, Tatiana V., Nguyen, Khang Sinh & Nguyen, Van Khuong, 2022, New orchids in the flora of Vietnam (Orchidaceae, Aeridinae), Phytotaxa 555 (2), pp. 113-135 : 115

Chiloschista sweelimii Holttum (1966: 147) .

( Figs. 1 E–G )

Type: — MALAYSIA. Malay Peninsula, North Perak, June 1965, cult. Penang, Lim Swee Linn sine n. (holotype K000891272 ) .

Habitat, phenology and conservation status: —Epiphyte. Broad-leaved evergreen lowland forests. Fl. June. Very rare. Suggested IUCN Red List status – DD.

Distribution: — Vietnam. Malaysia (Malay Peninsula).

Note: —The occurrence of this species in Vietnam is documented only by a series of photos made an anonymous photographer from cultivated plants in a private garden in Buon Me Thuot Town (Dak Lak Province). It is very close to the widespread C. parishii , differing primarily “in the quite high narrow triangular side-lobes and the hairy edges of the petals” ( Seidenfaden & Wood 1992) and may be regarded as its southern allopatric race. The locality of this species in Vietnam, which is more than 1300 km distant from the locus classicus in Malacca Peninsula, needs confirmation by more collections or observations. According to available data its IUCN conservation status should be assessed as Data Deficient DD.

Studied specimens: — VIETNAM, wild collected plant cultivated in private garden probably originating expectedly from northern Vietnam, anonymous photo in Nguyen Van Canh archive s.n. (LE01088051 https://en.herbariumle. ru/?t=occ&id=45097).

Figures

FIGURE 1. Ascocentropsis malipoensis. A. Flowering plant (AL 1295), B. Flower, half side view (AL 1187). Chiloschista parishii var. minutiflora. C. Inflorescence. D. Portion of inflorescence with fully open flowers (Nguyen Van Canh, Nguyen Hoang Tuan, s.n.). Chiloschista sweelimii. E–G. Flowering plant, inflorescence and flower, half side view (Nguyen Van Canh s.n.). Cleisostoma equestre. H. Flowering plant, I. Flower, frontal view (AL 1123a). Photos by Nguyen Phi Tam (A), L. Averyanov (B), Nguyen Van Canh (C, D, H, I), and anonymous photo (E–G).