ABSTRACT
L., Sp. Pl.: 310 (1753); Baker in F.T.A. 7: 477 (1898), pro parte; Oberm. in Bothalia 7: 669-767 (1962), pro parte; Nordal et al. in Mitt. Inst. Allg. Bot. Hamburg 23: 535-559 (1990); Kativu & Nordal in Nordic Journ. Bot. 13: 59-65 (1993); Nordal & Thulin in Nordic Journ. Bot. 13: 257-280 (1993)
