. Report of the geological exploration of the fortieth parallel . es: achenia oblong, crownedwith a slightly elevated ring.—A dense much-branched plant, shrubby at thebase, in habit not unlike some narrow-leaved Linosyris. Central flowerswith a rudimentary seed, but possibly infertile. Canons of CottonwoodCreek and American Fork, in the Wahsatch; 6,000 feet elevation; Plate XIX. Fig. 1. A single stem: natural size. Fig. 2. Recep-tacle. Fig. 3. Involucral scale; each enlarged four times. Fig. 4. Anouter pistillate fertile flower. Fig. 5. An inner perfect flower: each enlargedeight
. Report of the geological exploration of the fortieth parallel . es: achenia oblong, crownedwith a slightly elevated ring.—A dense much-branched plant, shrubby at thebase, in habit not unlike some narrow-leaved Linosyris. Central flowerswith a rudimentary seed, but possibly infertile. Canons of CottonwoodCreek and American Fork, in the Wahsatch; 6,000 feet elevation; Plate XIX. Fig. 1. A single stem: natural size. Fig. 2. Recep-tacle. Fig. 3. Involucral scale; each enlarged four times. Fig. 4. Anouter pistillate fertile flower. Fig. 5. An inner perfect flower: each enlargedeight times. Fig. 6. Stamen. Fig. 7. Style of inner flower; each enlargedtwelve times. ((532.) Artemisia spinescens. (Picrothamnus desertorum, Xutt.) Low, fru-tescent, densely-branched, white-tomentose ; leaves scarcely 3 long, pedatelj3—5-parted, the divisions 3-lobed, lobes oblong; heads rather small, globose,in short axillary racemes or spikes, the rachis persistent 2—3 years and spin-escent; involucral scales 5-6, obovate, obtuse, concave; receptacle small,. : DIVER. CATALOGUE. 281 naked; florets densely woolly, the 1-4 outer ones pistillate and fertile, havingshort truncate obscurely 2-3-toothed corollas, branches of the style exserted,smooth ; achenia oblong-obovate ; inner florets 4-8, perfect but sterile, corollasinflated-funnel-form, 5-toothed, styles undivided, expanded and radiatelypenicillate at the summit.—Plant 4-18high, very bitter to the taste. Northsources of the Platte, (Nuttall:) Laramie plains, in alkali-flats, (D. C. E.)Abundant in the valleys of Nevada, and also collected on the islands of GnatSalt Lake; June. There is no good reason why this should not be anArtemisia, of the section Dracunculus; the style of the sterile florets is precisely that of A. borealis, caudata, etc., and the oilier characters are not dis-cordant with the genus. Plate XIX. Fig. 15. Abranchlet; natural 1G. A leaf; enlarged two diameters. Fis>\ 17. An involucral scale
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