. Report of the geological exploration of the fortieth parallel . glabrous; stem 2-3° high,erect, striate; cauline leaves linear, 2-.) long, 1 wide, entire, or the lowerones with a few small teeth near the base; heads 3 long, 5-7-flowered,nearly sessile along the straight diverging paniculate branches; involucreof 5_8 scales and several minute bractlets; achenia oblong-clavate, slightlyone-sided, rugose-tuberculate between the 5 longitudinal undulate ridges:pappus of about •; slightly unequal distinct setae, plumose to the base.—(ioloradoto California. West Humboldt Mountains, Nevada, and
. Report of the geological exploration of the fortieth parallel . glabrous; stem 2-3° high,erect, striate; cauline leaves linear, 2-.) long, 1 wide, entire, or the lowerones with a few small teeth near the base; heads 3 long, 5-7-flowered,nearly sessile along the straight diverging paniculate branches; involucreof 5_8 scales and several minute bractlets; achenia oblong-clavate, slightlyone-sided, rugose-tuberculate between the 5 longitudinal undulate ridges:pappus of about •; slightly unequal distinct setae, plumose to the base.—(ioloradoto California. West Humboldt Mountains, Nevada, and on Promon-tory Point, and near Salt Lake (lity, Utah ; 4,300-5,000 feet elevation ; May-September. Plait. XX. Fig. 5. Mature achenium; magnified twelvediameters; the tubercles are sometimes more decidedly in a double rowbetween the ridges. (700.) Stephanomeeia exigua, Nutt.! (Hemiptilium Bigelovii, Gray! Bot,Mex. Boundary, 105.) Annual, glabrous; stems 1-2° high, diffusely muchbranched, the branches very slender; lower leaves linear, with a few subulate. .J CATALOGUE. 199 teeth towards the base ; upper ones smaller and passing into subulate bracts,(always?) auriculate with 2 minute teeth: beads peduncled, irregularlycorymbose-paniculate, 3 long, 3-9-flowered ; involucre as in the last; achenialinear, straight, slightly enlarging upward, strongly 5-angled and with adouble row of tubercles between the angles; pappus usually of 15 seta1,plumose from near or below the middle to the top, 3 from each angle of theachenium, with their slightly dilated bases commonly united.—The setse arcsometimes plumose for the greater part of (heir length, and the dilation aftheir base is scarcely greater than in S. paniculate which has, moreover,quite as rugose and tubercled an achenium; it seems, therefore, advisable tomerge Hemiptilium into Stephanomeria. California to Colorado and NewMexico; Virginia City, (Bloomer.) Foot-hills throughout. Nevada, and onCarrington Island, Great Salt Lake
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