. Report of the geological exploration of the fortieth parallel . g, or with a single erect virgate stem;leaves and brads usually linear-oblong, not mifrequently ovate-oblong or spat-ulate, always obtuse: flowers small, but little exceeding the calyx, blue; theprickly margin more or less contracted over the back of the nutlet, and theprickles more or less confluent, E. patulum, Lehm., of Western Asia, towhich this plant was at first referred, differs from E. Redowskii (as shown byspecimens in Herb. Gray.) only in the tuberculations upon the fruit, whichin the former species are few in number,
. Report of the geological exploration of the fortieth parallel . g, or with a single erect virgate stem;leaves and brads usually linear-oblong, not mifrequently ovate-oblong or spat-ulate, always obtuse: flowers small, but little exceeding the calyx, blue; theprickly margin more or less contracted over the back of the nutlet, and theprickles more or less confluent, E. patulum, Lehm., of Western Asia, towhich this plant was at first referred, differs from E. Redowskii (as shown byspecimens in Herb. Gray.) only in the tuberculations upon the fruit, whichin the former species are few in number, arranged regularly in longitudinalrows upon the back and upon the outer edge of the sides, and armed withcurved points. The differences are represented with tolerable accuracy inthe plate. From Western Texas to Arizona and northward to the Saskat-chewan, Bear Lake and Fort Youkon. Frequent in the valleys and on themountains from the Sierras to the Wahsatch; 4-8,000 feet altitude ; May-July. Plate XXIII. Figs. !>, 10. Achenium of E. Redoioskii, Var. Occident-. CATALOGUE. 247 ale. Figs. 11, 12. Achenium from Asiatic specimen of E. Redowskii. , 14. Achenium of E. palatum ; all enlarged eight diameters. (861.) Var. strictum. (E. strict um, Nees., App. Neuwieds Trap. 17; not oiLedebour.) The prickles united over the back into a strongly indexedborder.—An extreme stale, but various intermediate forms are Mexico to Colorado and westward. Valleys and foot-hills of WesternNevada, with the last. (SG2.) Coldenia1 iiispidissima, Gray. Proc. Amcr. Acad. 5. 340. {Eddya,Torr. Pac. R. R. Rep. 2. 170, t. 8.) Prostrate, much-branched, very hispid ;branches 3-10 long, from a woody base; leaves 3-5 long, linear, entire,revolute, acute, somewhat fascicled at the ends of the short branchlets, hispidwith rigid white hairs ; flowers solitary ; calyx deeply 5-parted, lobes linear,tube indurated in fruit; corolla white, 2-3 long, salver-form, without scales ; COLDENIA, L. (Inclu
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