Smaller, 0.3-1.2 m; lvs 5-10 pairs below the infl, rhombic-ovate to lance-linear, acute or obtuse, 5-12 cm; chiefly on the Great Plains and in Minn. (H. subrhomboideus)

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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