Nelson: New Plants from Wyoming 231 



min 



brush. In fact P. exilifolias 

 vdb. of Montana though soe 



mens and descriptions show these also clearly distinct. 



This species is common on dry stony plateaus in southern 

 Wyoming and has been distributed by me as P. laricifoliiis under 

 the following numbers: 419, 1442, 5015 and 7460. The latter 

 is taken as the type and is from Halleck Canon, July 6, 1900. 



Pentstemon exilifolius desertus 



Quite similar ; the leaves broader ; calyx purplish ; corolla 

 purple ; pubescence in the throat yellow, stiffer than in the species. 



This variety occurs sparingly on dry sandstone ridges in the 



Red Desert. Point of Rocks, June 12, 1900, no. 7160. 



* Castilleja collina 



Many stemmed from a short caudex with an enlarged crown, 

 15—25 cm. high (the plant often as broad): the roots usually num- 

 erous, yellowish, thickened, semi-fleshy : pubescence a fine puber- 

 ulence with some soft white woolly hairs at the base of the leaves, on 

 their margins and in the inflorescence : stems simple, the exterior 

 ones in the cluster decumbent : leaves 2-4 cm. long, dark green, 

 variously cleft ; the lower mostly pinnately, with the body narrowly 

 lanceolate and cuneate at the base, the divaricate lobes linear or 

 broader, sometimes again cleft, 1-3 on either side ; the upper 

 similar but with the undivided center becoming broader (oblong 

 or broader) : bracts bright red, more freely cleft than the leaves, 

 as large or larger : calyx sparsely soft pubescent, cleft nearly to 

 the middle before, less deeply behind, the lobes again cleft half 

 their length into lanceolate segments : corolla yellowish, about 3 

 cm. long ; galea distinctly exceeding the tube, slender, truncate 

 or with a short tooth at apex, obscurely pubescent on the exserted 

 tip; lip very short, 3 -toothed, the central one short, the lateral 

 longer, acute, divaricate. 



This species is common in southeastern Wyoming on gravelly, 

 granite slopes. It has often been collected, the earlier specimens 

 having been disturbed as C. parviflora. Later it has been disposed 

 of (under protest) as C. angustifolia (Nutt.) Don. From this it 

 differs in its broader, always cleft leaves, its shorter inflorescence 

 (short even in fruit), in its unequally cleft calyx, in its galea which 

 exceeds the tube and in its characteristic lip. The color, too, is 

 not the scarlet varying to yellow that occurs in C. angustifolia. , 



The type no. is 6995, Sand Creek, May 31, 1900. 



