Polycalymma
(from poly, many, and kalymna, a covering; in allusion to the numerous series of involucral bracts). ORD. Compositae. A monotypic genus, now included, by Bentham and Hooker, under Myriocephalus. The species is a glandular-puberulous, half-hardy, perennial herb, requiring similar treatment to Centaurea (which see).
P. Stuartii (Stuart's). fl.-heads white, depressed-hemispherical, 1in. or more in diameter; florets many, 1/4in. long; outer involucral leaflets 1/3in. long. l. alternate, sessile, elongated-linear, flat, 3in. to 4in. long, 1/8in. broad; uppermost ones scarious, white. Stems fistular, striated, 1ft. or more long. Australia.