Nelsox': New Plants from Wvomixg 4^3 



Senecio Laramiensis 



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Tufted, perennial : the branches of the caudex with one to sev- 

 eral, leafy crowns, permanently white-tomentose, somewhat floc- 

 cose in age, 1-3 dm. high : stems few to several, slender, ascending, 

 the sparse leaves rather uniform, becoming bract-like in the inflo- 

 rescence only : basal leaves crowded, linear, rarely narrowly 

 oblanceolate, entire, 4.8 cm. long; stem-leaves similar: inflorcs- 

 cence a corymbose cyme, of few to several heads: heads 10-12 

 mm. high ; calyculate bracts few, small and inconspicuous or 

 none : rays few (10, more or less): akenes oblong, glabrous, in- 

 conspicuously striate. 



Senecio caniis Hootc. as represented in herbaria includes several 

 forms that when better understood will probably be considered 

 distinct The species now proposed is one of the most divergent 

 of these. In fact, it is so different in habit and general appear- 

 ance that at first one is not inclined to associate it with 5. camis^ 

 but rather with S: zverncracfoliiis Gray. Critical examination 

 shows, however, that it is much more nearly related to the former, 

 from which its smaller size and narrow entire leaves are the obvious, 

 superficial characters separating it. It is abundant in the vicinity 

 of Laramie, on the naked, red clay hills. Distributions have been 

 made to many herbaria as S. zverncracfolius under nos. 224 and 

 1379. I hav^e seen no specimens of this except the numbers cited 

 and other collections from the same localities. 



Senecio Nelsonii Rydb.* 



Many-stemmed from a densely tufted caudex whose numerous 

 branches are reduced to short leafy crowns, green and nearly 

 glabrous, the thin tomcntum unequally distributed and most of it 

 early deciduous: leaves very numerous, crowded on the crowns 

 and several on the stems, oblong, lanceolate, or oblanceolate in 

 outline, from pinnately toothed to deeply lobed or sometimes di- 

 vided nearly to the midrib, the segments obtuse or acute, often in- 

 cisely toothed ; stem-leaves slightly reduced upward : stems 

 2-4 dm. high, simple, terminating in a crowded, corymbose cyme, 

 the upper pedicels subumbellate : heads 7- 10 mm. high, calyculate 

 bracts small, only i or 2 ; rays few (6-12), rather large : akenes 

 brown, glabrous, distinctly striate, 2—3 mm. long. 



* Professor Nelson had given another name in his manuscript, but that name is a 

 homonym. In his absence on a botanical expedition, I take pleasure in dedicating this 

 species to the discoverer and describer. — P. A. R.' , ' 



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