198 
BOTANY. 
glabrous ; stems single, much branched, lower leaves 2-3' long, runcinately 
toothed, upper ones reduced to salndate entire or 2-4-tootlicd 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 setse, 
plumose nearly or quite to the base. — Oregon and California to Arizona, New 
Mexico and Colorado ; Carrington Island, Great Salt Lake, (Stansbury.) 
Kear 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, 2^-3" long ; scales of the slender involucre 3, bristles as many ; 
achenia oblong-linear, 5-angled and with two less prominent stria? on each 
face, not ttibercled ; 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 unecpial distinct setae, 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.) 
Stephanomeria exigua, Nutt. ! {Hemiptiliian Bigelovii, Gray ! Bot. 
Mex. Boundary, 105.) Annual, glabrous; stems 1-2° high, ditfusely much 
branched, the branches very slender ; lower leaves linear, with a few subulate 
