Sep 5-12, often 6, petaloid; pet and staminodes none; pistils numerous; ovary tapering to a short style; achenes conic to fusiform, hairy; perennial herbs with basal, simple, lobed lvs and several 1-fld scapes bearing a calyx-like involucre of 3 entire bracts just beneath the fls. 4, Europe and N. Amer. Our 2 spp. closely allied and also close to European H. nobilis Miller.

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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