Flora of North America species comparison

erect, hairy.

erect, simple, glabrate to hairy.

basal and proximalmost cauline withering by flowering;

cauline sessile;

blades obovate, 10–40 × 3–10 mm, margins entire, apices acuminate to slightly cuspidate, faces hairy, resinous.

basal (in rosettes, usually withering by flowering) and cauline; alternate; petiolate (basal) to sessile (cauline);

basal blades spatulate, margins distally serrate;

cauline blades 1-nerved (reticulately nerved), linear, obovate or ovate, reduced distally, margins serrate or entire, ciliate (apices acuminate to acute, sometime slightly cuspidate), faces glabrate or hairy.

bracts broadly lanceolate to narrowly ovate, hairy.

5–8 mm.

cylindric, (3–9 ×) 2.4–8.5 mm.

slightly convex, pitted, epaleate.

fusiform-obconic, 1–3 mm, densely strigose;

pappi: inner series 6–8 mm.

2–5;

corolla tubes 3–4 mm, laminae 3–6 mm.

1–6, pistillate, fertile;

corollas white.

6–11;

corolla tubes 4–6 mm, lobes 1–2 mm.

5–19, bisexual, fertile;

corollas white to cream, tubes shorter (longer in S. linifolius) than weakly funnelform throats, lobes 5, erect to spreading, triangular;

style-branch appendages linear-lanceolate.

in 4–5 series, outer 2–3 mm, first mid 3–4 mm, second mid 4–6 mm, puberulent.

15–30 in 3–5 series, 1-nerved (± keeled), thumbnail-shaped, inner more linear, unequal, bases ± indurate, margins scarious, ciliate, apices with dark green zones, (faces glabrate to hairy).

2–4 per branch, in corymbiform arrays.

radiate, (2–5 per branch in clusters) in corymbiform to broadly corymbiform (sometimes compact) arrays.

fusiform to obconic, terete to slightly compressed, 7–10-ribbed, ± densely strigose;

pappi persistent, of 25–50, white to tan or rust, barbellate bristles in (2–)3(–4) series (outermost, when present, 0.1–1 mm, outer distally attenuate, 3–7 mm, inner distally clavate, 3–8 mm).

= 9.

= 18.