Flora of North America species comparison

arising directly from the root, spreading to decumbent or prostrate, solid, not fistulose or disarticulating into ringlike segments, pubescent or glabrous.

petiole (3–)10–20 mm;

proximal blades 2–5(–6) × 2–5(–7) mm, acerose, distal blades 3–5 × 0.5–1.5 mm, awn-tipped.

usually persistent through anthesis, basal and cauline, opposite;

petiole present;

blade broadly elliptic or round to reniform, becoming linear, margins entire, awn-tipped at proximal nodes.

terminal, cymose;

branches dichotomous, not brittle or disarticulating into segments, round, usually glabrous;

bracts 2, distinct, somewhat leaflike and seemingly succulent, mucronate, pubescent to glabrate.

absent.

0.8–1 mm.

(6–)9–15 per involucral cluster at any single time during anthesis;

perianth yellow, broadly campanulate when open, narrowly urceolate when closed, woolly-tomentose abaxially;

tepals 6, connate proximally, monomorphic, entire apically;

stamens 9;

filaments basally adnate, glabrous;

anthers yellow, ovate.

1–1.2 mm.

included, light brown, not winged, 3-gonous, glabrous.

embryo curved.

bracts 2–5 mm;

awns 1–3 mm.

bracts in 1 whorl of 5, distinct, narrowly lanceolate, awn-tipped.