Flora of North America species comparison

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

usually quickly deciduous, basal, rosulate;

petiole present;

blade spatulate, margins entire.

terminal, cymose;

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

bracts 3–4, perfoliate and connate, spreading to recurved, usually 4-lobed proximally, 3–lobed distally, oblong to triangular, mucronate, sparsely glandular.

absent.

1 per node, tubular, turbinate, 4-angled, ventricose and sharply angled;

teeth 4, mucronate.

bisexual or unisexual, distal shorter one bisexual, proximal longer one pistillate, 2 per involucre;

perianth bicolored, with floral tube yellow and lobes white to pink or rose, funnelform when open, tubular when closed, glabrous but densely papillate abaxially;

tepals 6, connate 1/3 their length, monomorphic, 2-lobed apically;

stamens 9;

filaments free, glabrous;

anthers maroon to red, oblong.

exserted (bisexual) or included and aborted (pistillate), dark brown to black, not winged, 3-gonous, glabrous.

embryo curved.

= 19.