Plants 3-10 dm, roughly pubescent. Stems sparingly branched. Leaves 3-9(-14) × 1.5-5 cm; blade ovate to lanceolate, rounded to obliquely subcordate, adaxial surface glabrate or sparsely pubescent, abaxial surface scabrous or puberulent especially on veins, margins minutely pubescent to scabrous, hairs pointed sharply forward, apex long-acuminate to acute. Flowers 2-3(-4); perianth turbinate, narrowed basally; tepals spreading, dull or creamy white to greenish white, oblanceolate, 8-18 mm, apex short-acuminate; stamens included or exserted, 8-15 mm; filaments filiform, 6-15 mm; anthers 3-5 mm, glabrous or minutely sharp-bristled; ovary ellipsoid, glabrous or somewhat pubescent, ovules 2 per locule, pendulous; styles glabrous or basal 1/2 pubescent; stigma not lobed or rarely weakly 3-lobed. Berries bright red, 4 (-6)-seeded, ovoid to obovoid, beaked with persistent style bases, 8-16 mm. Seeds 5-6 mm. 2n = 18.
Flowering early spring--mid summer. Damp, shady forests and thickets; 100--2000 m; Alta., B.C.; Calif., Idaho, Mich., Mont., Oreg., Wash.
The three geographical races recognized as varieties by Q. Jones (1951), i.e., var. hookeri (coastal California northwards), var. oreganum (northern California north and northwestward), and var. trachyandrum (Sierra Nevada northwest to Oregon), are highly variable and intergrade with respect to their purportedly diagnostic differences in pubescence on the anthers, ovaries, and styles, and in the degree of stamen exsertion. This is especially true in their overlapping ranges in northern California and southern Oregon. Whereas the extremes may be distinctive, overall the varieties so intergrade that they are not here recognized.
From this same area, where the Coastal, Sierra, and Cascade ranges meet, the purported, sterile hybrid Prosartes parvifolia was first reported. The few older collections attributed to P. parvifolia and recent dwarf ones of P. hookeri from this area are similar, especially those from serpentine substrata, and the known variation in P. hookeri unquestionably encompasses the morphology described for P. parvifolia.
The recently discovered population of Prosartes hookeri in the Porcupine Mountains of upper Michigan (E. G. Voss 1972-1985, vol. 1) is a noteworthy disjunction for this otherwise western species.
Much like no. 2 [Disporum lanuginosum (Michx.) G. Nicholson]; lvs long-acuminate, puberulent on the lower surface; tep creamy-white, short-acuminate, widest at or above the middle; stamens usually well exserted; ovary and lower half of the style usually hairy; stigma subentire; 2n=18. Woods; B.C. to Calif. and w. Mont.; disjunct in n. Mich. May, June. (Prosartes h.) Ours is var. oreganum (S. Watson) Q. Jones.
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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