Flora of North America species comparison

arising directly from the root, spreading to decumbent, solid, not fistulose or disarticulating into ringlike segments, glabrous or minutely strigose or glandular.

usually persistent through anthesis, basal and rosulate or basal and cauline, alternate;

petiole present (basal leaves);

blade narrowly lanceolate to oblanceolate or spatulate to orbiculate, margins entire.

terminal, cymose;

branches mostly dichotomous, not brittle or disarticulating into segments, round, minutely strigose or glandular, glabrous;

bracts 3 per node, connate basally, scalelike, triangular, not awn-tipped, glabrous or sparsely glandular.

straight or flexed, slender to filiform, sometimes absent.

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

perianth yellow to reddish yellow, broadly campanulate when open, narrowly urceolate when closed, pilose abaxially;

tepals 6, monomorphic, entire apically;

stamens 9;

filaments basally adnate, glabrous;

anthers yellow, oval.

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

embryo curved.

bracts in 2 whorls of 3, connate proximally, lanceolate, not awn-tipped.

= 20.