﻿Nelson : New Plants from Wyoming 379 



Picradenia piimila Greene, Pitt. 3: 271. Feb. 1898. 



Recently in rehabilitating Sir Wm. Hooker's genus Picradenia, 

 Dr. Greene published, among others, as new, P. pumila. This it 

 seems is the same as my Hymenopappus HgulaeJIorus, so this 

 specific name will have to stand, though, now that the plant is 

 transferred from a rayless genus to one in which ray-flowers are 

 normal, this name no longer has any special significance. My 

 original specimens of this were distributed to several under no. 

 *573 or 1603. 



/ Senecio scaposus. S, lirtnsrUvC*. um % 



Perennial from a multicipital caudex, cespitose in habit or 

 surculose-spreading, forming large mats ; stems very numerous, 

 simple, one (sometimes 2 or 3) from each prostrate-assurgent 



crown of the caudex, scapose, 1-2 dm. high, tardily glabrate : 

 leaves crowded on the crowns of the caudex and at the base of 

 the scapose stems, of two forms, the larger from narrowly elliptic 

 to oblong, 2-4 cm. long, obtuse or acute or, more rarely, 

 3-toothed, the middle tooth much the largest (with this removed 

 such a leaf is truncate), tapering into a petiole as long as the 

 bjade or longer, nearly glabrous at flowering, the midrib plainly 

 discernible and a pair of lateral veins obscurely so ; the smaller 

 leaves tomentose, interspersed bract-like among the larger ones, 

 oblanceolate to spatulate, rarely 3-toothed at the apex; bract-like 

 leaves of the scape small, linear from a broad tomentose base ; 

 heads several (3-8 or rarely only 1 or 2), cymose-corymbose, the 

 terminal one overtopped by most of the others, 9-12 mm. high : 

 involucre obscurely or not at all calyculate, bracts linear-lanceolate, 

 slightly scarious on the margins : rays 5-9, oblong-elliptic, $r7 

 mm - lon g. golden yellow : achenes seemingly glabrous. 



petrophilu 



*"c species tnat it most nearly approacin-^ w ^,. r ^-~y 

 Greene from which it differs in its larger size throughout, its de- 

 cidedly scapose aspect and its very cespitose habit ; this belongs 

 t0 _the foothills; that is alpine in habitat, in sheltered, rocky 

 canons where it is seemingly a rare plant. 



Laramie Hills, June 6, 1896. Type specimen in Herb. Univ. 

 of Wyoming, no. 1908. 



PeNTSTEMON RIPARIUS. 



. The numerous stems (5-25) arising from a woody rootstock, 

 th 's sometimes an inch or two in diameter at the crown ; stems 

 st °ut, spreading in all directions, prostrate-assurgent, 24 dm. long, 



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