Maesa sleumeri Dhatchan. & Devanath. 2024, nom. nov.

Maesa sleumeri Dhatchan. & Devanath. nom. nov. Replaced synonym:— Maesa lineolata Sleumer (1987: 54), nom. illeg., non M. lineolata H.R. Fletcher (1936:43). Type:— INDONESIA. Netherlands New Guinea, Hollandia, 200 m, 26 Jul. 1961, P. van Royen & H. O. Sleumer 6313, (Isotypes: K [K000756284 digital images!, K000756285 digital images!], US [US00025527 digital images!, US 00901705 digital images!]) Paratype:— INDONESIA. Netherlands New Guinea, Hollandia, Cape Tanah Merah, 70 m, 7 Aug. 1961, P. van Royen & H. O. Sleumer 6504 (US [US 03109191 digital image!]). Etymology:— This species named in honor of Dr. Hermann Otto Sleumer for his excellent collections and outstanding works on the New Guinean Maesa. Distribution:— Endemic to New Guinea. Other specimens:— INDONESIA. Netherlands New Guinea, Distr., Hollandia, 20–100 m, 14 Jun. 1938, L.J. Brass 8809 (HU [HU 01873772 digital image!]); Netherlands New Guinea, Jayapura, 29 Mar. 1973, J. Raynal s.n. (K [K 000272033 digital images!]); Jayapura, Böschung der Küstenstra sseimnordöstlichen Teil der Stadt., 50 m, 02 Feb. 1976, P. Hiepko & W. Schultze-Motel 573 (B [B 100272452 digital images!]). Notes:— Maesa sleumeri is different from all other New Guinean Maesa species (Sleumer 1987). The New Guinea plant (M. sleumeri) can be easily differentiate from the Thailand plant (Fletcher’s M. lineolata) by following characters: obovate–broadly oblong leaves, recurved leaf margins, obtuse leaf apex, 2–5cm long, thick petiole, 5–6(–7) lateral vein, 1–2 or 6-flowered, axillary simple racemose inflorescence, 1–2.5 cm long, filiform pedicle and c. 9 mm across, urceolate, glabrous corolla.