UW Burke Herbarium species comparison

Leaves opposite, entire, rather fleshy, usually glabrous, paler beneath, the blade ovate to triangular or lanceolate, 2-7 cm. long, narrowed abruptly to a short petiole.

Leaves opposite, the blades elliptic to oblong-ovate, 2-6 cm. long and about half as wide, narrowed obliquely to slender petioles about as long.

Flowers perfect, several in pedunculate heads subtended by 5 whitish, membranous, ovate to broadly lanceolate involucral bracts 8-18 mm. long and 4-12 mm. broad;

flowers fragrant;

perianth puberulent, with a narrow tube 16-20 mm. long and 5 flaring lobes 7-10 mm. broad, white or pinkish;

corolla none;

stamens 4-5, included;

style 1, included.

Flowers perfect, in heads on long peduncles, subtended by 5 narrowly lanceolate involucral bracts 5-6 mm. long;

perianth glandular-pubescent, with a narrow greenish to pink tube 6-8 mm. long and 5 flaring, reddish-purple lobes 5 mm. broad;

corolla none;

stamens 4-5, included;

style 1, included.

Achene 8-10 mm. long, pubescent, tapered at both ends or truncate at the top, wingless, or with 4-5 thick, hollow wings not as wide as the body.

Achene 10-12 mm. long, prominently 3-4 winged, the wings often broader than and projected above the hairy body.