198 BOTANY. 



glabrous ; stems single, much branched, lower leaves 2-3' long, runcinately 

 toothed, upper ones reduced to subulate entire or 2-4-toothed bracts ; heads 

 5_7.flowered, solitary on the ends of the branchlets ; proper involucral scales 

 5-7, 4-5" long; achenia 5-costate, smooth; pappus of about 15 distinct setas, 

 plumose nearly or quite to the base. — Oregon and California to Arizona, New 

 Mexico and Colorado; Carrington Island, Great Salt Lake, (Stansbury.) 

 Near Humboldt Lake, Nevada, (W. W. Bailey,) and on a ridge in Bear River 

 Valley, near Evanston, Utah ; 4-6,000 feet elevation ; July, August. (698.) 



Stephanomeria myeioclada. Caudex woody, bearing innumerable 

 densely crowded slender branching stems 8-12' long ; primary leaves not 

 seen, those of the branchlets linear-spatulate, acute, entire or runcinately 

 toothed, passing into subulate bracts ; heads terminal on slender branchlets, 

 3-flowered, 2J-3" long ; scales of the slender involucre 3, bristles as many ; 

 achenia oblong-linear, 5-angled and with two less prominent strias on each 

 face, not tubercled; pappus of 14-17 distinct setae, plumose to the base. — 

 Plant forming a dense hemispherical tuft about a foot high, the branches 

 irregularly ^dichotomous. On dry rocky ridges in Thousand Spring and 

 Goose Creek Valleys, Nevada ; 6-6,500 feet elevation; September. Plate 

 XX. Fig. 1. Portion of a plant ; natural size. Fig. 2. A flower ; magnified 

 four diameters. Figs. 3 and 4. Mature achenium and seta ; magnified twelve 

 diameters. (699.) 



Stephanomeria paniculata, Nutt. Annual, glabrous ; stem 2-3° high, 

 erect, striate ; cauline leaves linear, 2-3' long, 1" wide, entire, or the lower 

 ones with a few small teeth near the base ; heads 3" long, 5-7-flowered, 

 nearly sessile along the straight diverging paniculate branches ; involucre 

 of 5-8 scales and several minute bractlets; achenia oblong-clavate, slightly 

 one-sided, rugose-tuberculate between the 5 longitudinal undulate ridges ; 

 pappus of about 25 slightly unequal distinct setee, plumose to the base. — 

 Colorado to California. West Humboldt Mountains, Nevada, and on Promon- 

 tory Point, and near Salt Lake City, Utah ; 4,300-5,000 feet elevation ; May- 

 September. Plate XX. Fig. 5. Mature achenium ; magnified twelve 

 diameters ; the tubercles are sometimes more decidedly in a double row 

 between the ridges. (700.) 



Stephakomeeia exigua, Nutt. ! {Hemiptiliwn Bigeldvii, Gray ! Bot. 

 Mex. Boundary, 105.) Annual, glabrous ; stems 1-2° high, diffusely much 

 branched, the branches very slender ; lower leaves linear, with a few subulate 



