260 Rydberg : Studies on the 



long and fully as wide, very thin, at first white but turning pink in 

 age : filaments about 2.5 cm. long : anthers versatile, 1.5 cm. long 

 and 2 mm. wide : style exserted ; lobes of the stigma about 5 mm. 

 long : capsule with rather strong sinuately lobed ridges. 



This species differs from P. cacspitosum (Nutt.) Raimann in the 

 villous ciliate leaves, the longer hypanthium which is much broader 

 at the throat than in any of the other species, the longer sepals 

 which much exceed the petals in length, and the less tubercled 

 ridges of the pod. It grows in cairions at an altitude of 1500- 

 2800 m. 



Colorado : Tributaries of Turkey Creek, 1900, Rydberg & 

 Vreeland, ^^57 (type). 



Pachylophus exiguus (A. Gray) Rydb. nom. nov. 



Oenothera exigua A. Gray, PI. Fendl. 1849. 



This species was merged into P. caespitosus by Dr. Watson ; 

 but it is perfectly distinct. The plant is nearly always caulescent 

 with a stem 0.5-2 dm. high, the leaves and hypanthium are villous 

 as in the preceding species, but still more so, the hypanthium is 

 fully as long, but less widened at the throat, and the angles of the 

 pod with more prominent sinuately lobed crests than in P. caespi- 

 tosus. This species is represented in the New York herbaria by 

 the following specimens : 



Colorado: Rocky Ford, 1891, C, S. Crandall ; Mesas near 

 Pueblo, 1900, Rydberg & Vreeland, 58^8 ; Rocky Ford, 1900, 

 G. Oste7'ho2it, 2085. 



New Mexico : White Mountains, 1897, E. 0. Wooton, 6§g. 



Arizona: Walnut Canon, i^g^, MacDougal, j^i. 



Androsace puberulenta sp. nov. 



A puberulent rosulate annual : leaves oblanceolate, 1—3 cm. 

 long, acute, entire or sinuately denticulate, densely puberulent : pe- 

 duncles several, 3-10 cm. long : bracts narrowly lanceolate, 3-4 

 mm. long: pedicels 1-5 cm. long, spreading, densely puberulent : 

 calyx 3-4 mm. long, cleft to the middle ; tube glabrous, turbi- 

 nate ; lobes lanceolate, strongly keeled, densely puberulent, in fruit 

 much exceeding the short capsule : corolla white, about equalling 

 the calyx. 



This species is in habit intermediate between A. siibinnbellata 

 and A. diffusa, but differs from both in the densely puberulent 



