CATALOGUE. 309 



and somewhat reniform, the involucres not glandular, and the white or 

 pinkish calyx glabrous. Specimens collected in Arizona by Dr. Palmer in 

 1870 are 1° high, very slender and delicate; the glabrous ovate achenium 

 exceeding the calyx. 



Eeiogonum trichopodum, Torr. T. 8; G., I. c, p. 185. Leaves finely 

 pubescent or glabrous above, oval or rounded, sometimes subcordate, long- 

 petioled ; scape short, sometimes very short, rather rigid, often fistulous and 

 occasionally inflated ; panicle divaricately much-branched, the branches elon- 

 gated ; bracts not woolly ; pedicels capillary, divaricate and mostly secund 

 along the ultimate branchlets ; involucre i" long or usually less, glabrous, 

 very fisw-flowered, 4-5-cleft ; calyx yellow, densely pubescent, about twice 

 longer than the involucre, the segments similar and nearly equal. — 1-2° high ; 

 much resembling the next, but (as shown by Palmer's specimens) with more 

 numerous and slender branches, the scapes and internodes shorter and less 

 frequently inflated, the branches more simple and pedicels secund, the 

 involucres fewer-flowered and the calyx and achenium smaller ; the whole 

 plant of a decided yellow hue. Western Texas to Southern Cahfornia and 

 collected by Dr. Palmer in Southern Utah. 



Eeiogonum inflatum, Torr. T. S^ G., I c, p. 185. Annual, 1^-2° high; 

 leaves radical, hirsutely or velvety-pubescent, sometimes glabrate, orbicular 

 or rounded-cordate on elongated petioles ; scape elongated, fusiform- inflated 

 above ; panicle efiusely very much branched, (usually compoundly umbellate 

 below, the primary rays sometimes inflated,) the branches rather rigid, naked 

 and elongated between the joints ; bracts ciliate, not woolly ; pedicels 

 capillary, divaricate, very glabrous, i-V or more long, not deflexed ; involucre 

 about i" long, smooth, 4-5-cleft, few-flowered, the segments similar and 

 subequal ; calyx yellowish, densely hirsute, obtuse at base, segments ovate, 

 subequal, becoming 1" long. — California, Arizona, and Nevada. Foot-hills of 

 the Trinity Mountains near the foot of Humboldt Lake ; 4-4,500 feet alti- 

 tude ; May-August. As in other species, the younger specimens may be 

 very much reduced, sometimes but 3-4' high, with the panicle very simple, 

 the scapes slender and not at all inflated and the leaves only 3-4" in diame- 

 ter. (1,038.) 



Eeiogonum (Pseudo-stipulata) angulosum, Benth. T. 8^ G., I. c.^p. 178. 

 Annual, floccose-wooUy, at length glabrate, 4-12' high ; stems erect, leafy, 

 branching into a repeatedly di-trichotomous panicle ; branches acutely 



