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484 Nelson : New Plants from Wyoming 



When this was first secured it was confused with Senccio Fend- 



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Icri Gray under which name I have distributed specimens no. i 297, 

 Centennial Hills, June 9, 1895. 5. Fcndlcri is, however, a very 

 different plant as I found on examining at the Missouri Botanical 

 Garden, P^endler's nos. 478 and 480, preserved in the Engelmann 

 Herbarium. These are large plants with the appearance of having 

 grown as single, simple, stout, erect individuals, with an open, 

 corymbosely branched inflorescence.. Besides, S. Fcndlcri \^ lanate 



on stems and involucre. 



S. Ncbonii is abundant in the foothills in southern Wyoming, 

 occupying mostly steep naked stony or sandy slopes.' Besides 



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1897, no. 3217. 



Senecio Nelsonii Uintahensis 



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Habit and habitat of the species : basal leaves with long slen- 

 der petioles, all deeply divided, the lobes irregularly and incisely 

 dentate ; stem-leaves fewer, similar to the basal but with petioles 

 shorter, sessile above. 



This variety is possibly largely a geographical one. The 

 species occurs on stony, sandy slopes in the eastern part of the 

 state while the variety has been secured only in the western. No, 

 45 1 1, Evanston, June 4, 1898. 



Tanacetum simplex 



Caudex of few short crowded branches, covered with dead 

 leaf bases, the crowns scarcely above the surface of the ground : 

 leaves crowded on the crowns, closely and finely ai)i)ressed-siU 

 very-canescent, erect, mostly simple and linear, a few bifid or trifid at 

 apex, only 2-3 cm. long : stems few, rising singly from the crowns 

 (many of the crow^ns leaf-bearing 'only), slender, 6-12 cm. high, 

 bearing 2-5 small linear leaves and a single head: head 6-8 mm. 

 high, many-flowered : involucral bracts oval to obovate, hi two 

 row^s, w^ith slightly thickened greenish midrib and scarious mar- 

 gins : corolla tubes thin and somewhat transparent : the female 

 flowers in one series : akenes oblong, or slightly enlarged upward, 

 obtuse : pappus none : receptacle conical. 



Probably closest to Tanacetum canuni Eaton. Collected near 

 Laramie on a stony slope in the foothills, no. 4325, May ^o, 1898. 



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Certainly rare and far from abundant even in the type locality. 



