375. Platyschkuhria (A. Gray) Rydberg, Bull. Torrey Bot. Club. 33: 154. 1906.
[Greek platys, broad, and genus Schkuhria]
John L. Strother
Schkuhria Roth sect. Platyschkuhria A. Gray, Amer. Naturalist 8: 213. 1874
Perennials, 10–50+ cm (bases ± woody, branched caudices). Stems ± erect. Leaves basal and cauline; mostly alternate; petiolate; blades mostly lanceolate, sometimes ± ovate, margins en- tire, faces sparsely to densely scabrellous (hairs white, straight, conic or fusiform, 0.1–0.8 mm) and gland-dotted. Heads radiate, borne singly or (3–11) in loose, corymbiform to paniculiform arrays. Involucres campanulate to ± hemispheric, 12–25+ mm diam. Phyllaries 9–21 in ± 2 series, distinct, subequal, oblong or elliptic to lanceolate, herbaceous, membranous-margined (not purplish-margined), persistent, reflexed in fruit. Receptacles ± convex, ± pitted, epaleate. Ray florets 6–12, pistillate, fertile; corollas yellow. Disc florets 25–80+, bisexual, fertile; corollas yellow to orange (gland-dotted), tubes about equaling funnelform to campanulate throats, lobes 5, deltate to lance-deltate. Cypselae narrowly obpyramidal, 4-angled, finely nerved, ± hirsutulous (at least on angles), not gland-dotted; pappi of 8–16, (distinct) lance-elliptic to lance-subulate (basally and/or medially thickened, distally and/or laterally scarious) scales in 1 series (weakly, if at all, aristate). x = 12.
Species 1: w United States.
SELECTED REFERENCES
Brown, G. K. 1983. Chromosome numbers in Platyschkuhria Rydberg (Compositae) and their sys-tematic significance. Amer. J. Bot. 70: 591–601. Ellison, W. L. 1971. Taxonomy of Platyschkuhria (Compositae). Brittonia 23: 269–279.
