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Nelson : New Plants from Wyoming 7 



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which it is related in some of its characters. It differs, however, 

 from' both in its stouter habit, broader leaves, single flower, broader 



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bulb scales and floral characters. It has the leaf arrangement of 

 L. umbdlatiim but even broader leaflets than L. Philadelphiaim, 

 Both of the preceding are found in dry soil while this occurs only 

 in rich, shaded bog lands, mostly at subalpine (700C^9000 ft.) 

 stations but sometimes in cold wet ground at lower altitudes. 

 Secured at several points in this state and probably found in similar 

 situations throughout the northern Rockies. Type specimen no. 

 yi^76 bv Mr. Elias Nelson from Saw Mill creek in the Laramie 



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Abronia elliptica 



Perennial from a thick, deep-set, semi-fleshy, branched root : 

 stems several from the crown, ascending, the underground portion 

 rhizome-like and scaly, leafy above, minutely viscid-pubescent, 

 branched from the base only, the branches 1-2 dm. long : leaves 

 fleshy, glabrous, somewhat wrinkled when dry, mostly elliptic, 

 more rarely oval or ovate, obtuse at both ends or somewhat trun- 

 cate or subcordate at base, 15-30 mm. long; petioles from 1-3 

 times as long as the blade : bracts of the involucre obovate, sub- 

 acute, 8-15 mm. long, mostly 5 in number, greenish-white: flow- 

 ers greenish-white, numerous in the cluster, the individual flowers 

 inconspicuous, i 5-20 mm. long, the tube slightly dilated upwards, 

 limb small, lobes suborbicular, sinus narrow : fruit obscurely 

 pubescent, turbinate, summit truncate or ' subcordate, the sides 

 bearing five vertical wings with rounded obtuse summits, the cen- 

 tral cavity of the fruit extending through them, about 7 mm. high ; 

 akene oblong, 3-4 mm. long, loosely sheathed by winged pericarp. 



A very distinct species, readily recognized among those hitherto 

 described. In habit, but not in size, it suggests A. fragrans Nutt., 

 while in fruit character it belongs with the A. latifolia group. It 

 is of frequent occurrence in south-central Wyoming on the white 

 desert-like. Cretaceous clay slopes of the Red Desert and other 

 similar regions. Type specimen in Herbarium University of Wyo- 

 ming, no. 3024, Green River, May 30, 1897. Excellently fruited 

 specimens from Medicine Bow, July 9, 1898, by Mr. Elias Nelson. 



Arenaria Uintahensis 



Perennial, caespitose, the numerous, spreading branches of 

 caudex sub-ligneous : leaves chiefly basal on the crowns, numer- 

 ous, in fascicles, glabrous, narrowly linear, acerose, 1-2.5 cm. 



