Flora of North America species comparison

± decumbent to erect.

usually erect, sometimes decumbent to sprawling, often freely branched.

petioles 0–2 mm;

blades narrowly lance-elliptic to lanceolate or spatulate, 1–3(–6+) cm × 4–10(–20) mm, margins usually entire, rarely toothed, faces glabrous, rarely gland-dotted.

cauline; mostly opposite (distal sometimes alternate); petiolate or sessile;

blades (1- or 3-nerved) deltate, elliptic, filiform, lanceolate, linear, obovate, ovate, spatulate, or trullate, margins entire or toothed, faces glabrous or ± scabrellous, often gland-dotted.

2–7+ mm.

± campanulate to urceolate, 5–7+ mm.

± hemispheric or turbinate to campanulate or urceolate, 2–10+ mm diam.

flat or convex to hemispheric;

paleae cuneiform or spatulate to linear or setiform, ± membranous, sometimes all or partially wanting.

2–5;

corollas 0.3–1.5 mm.

usually 1–8+, rarely 0;

corollas whitish (inconspicuous), ± tubular.

outer 6–10 distinct, ± herbaceous.

persistent, 3–15+ in 1–3+ series, distinct or ± connate, all ± herbaceous or inner scarious to membranous.

in racemiform arrays.

discoid or ± disciform, in (± bracteate) racemiform or spiciform arrays (heads 1–2 in axil of each bract, bracts sometimes leaflike).

4–5 mm.

plumply obovoid to pyriform, often ± obcompressed, sometimes scabrellous or hispidulous distally, usually ± gland-dotted;

pappi 0.

linear to spatulate (distally dilated), 5–6 mm.

staminate florets 8–12+;

corollas 4–5 mm.

staminate florets 3–20+;

corollas whitish to pinkish, funnelform, lobes 5, soon reflexed (filaments ± connate, anthers coherent or distinct).

= 18.

= 34.