Novon 5: 349. 1995.
Plants branched from base, 10–40 (–60) cm, sparsely covered with dendroid and almost stellate hairs. Leaf-blades narrowly lanceolate or linear-lanceolate, plane, 2–5 × (0.1–) 0.2–0.5 (–0.6) cm. Inflorescences usually dense, ovoid, ovate-clavate, or ovate-cylindric, rarely interrupted near base. Bracts ovate or ovatelanceolate, 0.5–1.5 (–2) × 0.3–1 cm. Perianth segment 1. Fruits usually deep olive green, brown, or rarely to almost black, usually without spots and/or warts, or occasionally spotted, strongly convex abaxially, prominently concave to almost plane adaxially, usually broadest beyond middle, (3.2–) 3.5–4.5 (–5) × 2.2–3.3 (–3.5) mm; wing (when present) semitranslucent, to 0.2 mm wide, margins entire, apex rounded or indistinctly triangular.
Alta., B.C., Man., N.W.T., Ont., Sask.
Varieties 2 (2 in the flora).
The inflorescence bracts of Corispermum hookeri are conspicuously imbricate (usually strongly overlapping). Corispermum hookeri seems to be closely related to the narrow-winged taxa, C. villosum and C. ochotense, and to C. pallasii sensu stricto. The names C. orientale and C. hyssopifolium have been commonly misapplied to this species.
"broadest" is not a number.