Breynia acuminata (Müll.Arg.) Müll.Arg.

Esser, H. - J., Stuppy, W. H. & Welzen, P. C. van, 2022, Three new species and several typifications of Breynia (Phyllanthaceae) from Malesia, Blumea 67 (2), pp. 132-138 : 137

Breynia acuminata (Müll.Arg.) Müll.Arg.

Breynia acuminata ( Müll.Arg.) Müll.Arg. (1866) 442. — Melanthesa acuminata Müll.Arg. (1863) 74. — Lectotype (designated by Chakrabarty & Gangopadhyay 1996, as ‘type’): H. Cuming 1543 (G-DC*; isolecto A, BM, FI-W, GOET, K, KIEL, L, MO*, P*, TCD, UPS, W, WRSL*), Philippines, Luzon , Prov. Batangas, no date.

Breynia rumpens J.J.Sm. (1910) 227; syn. nov. — Lectotype (designated here): Atasrip (exped. C.E.A. Wichmann) 241 (BO; isolecto L), Indonesia, Irian Jaya, Lake Sentani , Apr. 1903.

Notes — 1. The collections from the Philippines and from New Guinea are morphologically nearly identical; the only minor difference may be the fruit size, 3.75–4.5 by 4.5–6 mm in the former, 4.5–5.5 by 5–6 mm in the latter.

2. Breynia rumpens had been synonymized with B. racemosa by Chakrabarty & Gangopadhyay (1996) and with B. cernua by Govaerts et al. (2000), but these synonyms are erroneous; B. racemosa has leaves distinctly glaucous beneath and does not occur in New Guinea, while B. cernua occurs in New Guinea but differs, e.g., by a much larger fruiting calyx, being larger than the fruit diameter.