S. Watson

Proc. Amer. Acad. Arts 24: 54. 1889

Etymology: For Edward Palmer, 1831–1911, American field botanist who collected the type material based on anagram of his surname
Treatment appears in FNA Volume 21. Treatment on page 509. Mentioned on page 460.
Annuals, 10–40 cm. Stems erect, much branched. Leaves basal and cauline; mostly alternate (proximal opposite); mostly sessile; blades 1-nerved, linear, margins entire, faces glabrous or puberulent, sometimes gland-dotted. Heads discoid, in loose, corymbiform arrays or borne singly. Involucres ± campanulate to obconic, 5–6 mm diam. Phyllaries persistent, 20–30+ in 3–4+ series, not strongly nerved, lanceolate, unequal (± chartaceous, margins scarious). Receptacles flat, epaleate. Florets 20–30; corollas white, throats cylindric or narrowly urceolate (lengths 5–6 times diams.); styles: bases not enlarged, glabrous, branches filiform-clavate. Cypselae fusiform, 5-ribbed, scabrellous on ribs; pappi persistent, of 3 muticous scales plus 3,aristate scales. x = 10.


w United States, nw Mexico.


Species 1.



Lower Taxa