Flora of North America species comparison

arising directly from the root, erect to spreading, solid, not fistulose or disarticulating into ringlike segments, sparsely glandular-pubescent.

usually quickly deciduous, basal, rosulate;

petiole absent;

blade spatulate to obovate, margins entire.

terminal, cymose, uniparous due to suppression of secondaries;

branches dichotomous, not brittle or disarticulating into segments, round, sparsely glandular-pubescent;

bracts 3(–5), positioned to side of node or perfoliate and completely but unequally surrounding node, connate nearly completely, triangular to ovate or oblong, awned, sparsely glandular-pubescent.

absent.

1–3 per node, tubular, cylindric, (2–)3–4-angled, slightly ventricose on the angles in some;

teeth (2–)3–4, awn-tipped.

1(–2) per involucre;

perianth white to pink, campanulate when open, cylindric when closed, pubescent abaxially;

tepals 6, connate ca. 1/3 their length, monomorphic, entire or erose to fimbriate apically;

stamens 6–9;

filaments free, glabrous;

anthers pink to red, oblong.

mostly included, brown to black, not winged, globose-lenticular, glabrous.

embryo straight.

= 19.