CATALOGUE. 311 



gradually reduced in size, sometimes subconnate at base ; involucre pedicelled, 

 the awns often unequal ; pedicels naked, at least the lower alar ones very 

 slender. Var. (O.foliosa, Nutt.) A large stout and leafy form, 6-1° high, 

 rather sparingly branched, the conspicuous cauline leaves broad and connate 

 at base ; involucres about 1" long, exceeding the awns ; calyx white or pinkish, 

 the outer segments pubescent, broad-oblong,' obtuse, the inner more delicate, 

 narrower and a little shorter ; ovary glabrous, as in other species. — Southern 

 Idaho, (Nuttall ;) near Empire City, Nevada, (Dr. Torrey.) Monitor Valley, 

 Nevada; 5,000 feet altitude ; July. (1,040.) 



Var. Very slender ; branches very numerous and many-flowered; upper 

 leaves small and inconspicuous ; involucres very small, i" long or less, shorter 

 than the awns ; inner segments of the calyx emarginate. — Resembling the 

 Chilian form. Pah-Ute Mountains and Monitor Valley, Nevada ; 5,000 feet 

 altitude; July-September. (1,041.) 



OxYTHECA Watsoni, T. & G.; /. c, p. 191. Effusely much branched, 

 4-10' high; radical leaves i-li' long, oblong-spatulate, scarcely mucronate, 

 pubescent ; bracts ovate or ovate-lanceolate, mucronate with a long awn, 

 usually connate but only at the base and mostly on one side, (where there is 

 often an accessory awned lobe,) diminishing upward, rigid and usually de- 

 curved, the uppermost reduced ones and the lobes of the involucre half shorter 

 than their rigid awns, (i-2" long ;) involucres about 3-flowered, subsessile 

 in the axils, or terminating short bibracteolate pedicels. — The glandular 

 pubescence is more dense above the nodes and sometimes stellate. Monitor 

 Valley, Nevada ; 5,500 feet altitude ; July. Plate XXXIII. Fig. 5. A 

 small plant ; natural size. Fig. 6. A node with bracts, involucre and flower; 

 enlarged four diameters. Fig. 7. A flower, expanded ; enlarged eight diame- 

 ters. (1,042.) 



Oxytheca perfoliata, T. & G-.; I. c, p. 191. Closely resembling 

 Chorizanthe perfoliata, low (3-6',) divaricately branched, glandular-pubescent 

 on the lower half of the internodes ; leaves scabrous, becoming glaucous, 

 red and chartaceous in older specimens, the radical ones spatulate, ciliate, the 

 cauline or bracts J-1' in diameter, scarcely diminishing upward, (half the 

 length of the internodes,) centrally perfoUate, excepting the lowest whorl of 

 3-4 small leaves, which are connate only at base, disk-shaped, subtriangular- 

 orbicular, reticulately veined, 3-awned ; involucres sessile in the axils, solitary, 

 the lobes U" long, subulate-lanceolate, equaling their awns, with 4-6 con- 



