Cal shallowly cupuliform, with (4)5 persistent setae; involucel 4- angled; marginal and central fls subequal; cor-lobes 4, subequal; perennial herbs with hemispheric, long-pedunculate heads. 3, Eurasia, Afr.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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