Flora of North America species comparison

moderately to densely hairy.

basal (rosettes) usually withering by flowering;

petiole bases or vasculature not persisting on rhizomes;

proximalmost cauline petiolate, sometimes present at flowering;

proximal and distal sometimes 3-nerved.

1-nerved, usually not striate (3–5-nerved and striate in S. glomerata, S. lancifolia, S. roanensis) sometimes minutely stipitate-glandular, sometimes resinous.

in wide arrays, usually with elongate proximal branches greatly exceeding subtending leaves.

in ± paniculiform or thyrsiform arrays (wand-, club-, or secund cone-shaped) or in axillary clusters, sometimes in rounded corymbiform arrays.

cauline leaf blades ovate, much reduced distally.

florets 5–9.

bristles in 2–3 series (shorter, outer setiform scales rarely present, outer, longer bristles apically attenuate, inner bristles longest, weakly to strongly clavate).

= 18, 36.