Small : North American Plants 318 



separate the Texan plant referred to Limonunn Californicwii 

 either varietally or specifically. An examination of considerable 

 material both from the Texas and the Californian districts discloses 

 the fact that there have been two perfectly distinct species con- 

 fused under the old Limonhim Californiaim. As in the case of 

 all the species of the genus the two under consideration resemble 

 each other in habit. The diagnostic characters are contrasted 



below : 



Liinoniiim Calif ornicinn. Calyx narrowly funnelform ; tube 

 glabrous ; segments erect or nearly so, rounded and mucronulate. 



Limoniiim limbatnni. Calyx trumpet-shaped ; tube hirsute ; 

 segments more or less spreading, broadly deltoid. 



The following specimens belong here: Wright, no. 1435; 

 Woodhouse, Zuni Mts., N. M., Aug., 185 i ; Wooton, no. 172. 



Androsace diffusa. 



Annual, acaulescent, more or less pubescent. Leaves basal ; 

 blades oblanceolate to spatulate or nearly linear, 1-4 cm. long, 

 obtuse or acute, sharply serrate above the middle or sparingly 

 toothed near apex only, sessile or with short winged petioles : 

 scapes erect and spreading, often diffusely branched at base, 5-10 

 cm. long or shorter : bracts lanceolate : pedicels filiform, very vari- 

 able in length, often 1-8 cm. long in the same cluster : calyx cam 

 panulate to turbinate-campanulate, 3-3.5 mm. high; segments 

 triangular, acute, ciliate, about y^ as long as the 5 -ridged tube ; 

 corolla white or pink, included, sometimes equalling the tips of the 

 calyx-segments, 3-3.5 mm. broad; segments oblong, obtuse or 

 retuse at apex, about as long as the tube : filaments shorter than 

 the anthers : capsules subglobose, about 3 mm. in diameter. 



In rocky soil, western Arctic America to the Dakotas, New 

 Mexico and Arizona. Spring and summer. 



For some inexplicable reason the species here described as new 

 has always been associated with Androsace septentrionalis with 

 which it has not even a habital resemblance. Androsace septen- 

 trionalis is a plant with strict, conspicuously elongated scapes 

 which are surmounted by umbel-like clusters of pedicels of nearly 

 equal length, whereas Androsace diffusa, has comparatively short, 

 more or less diffusely spreading scapes, while the pedicels of the 

 clusters are exceedingly variable in length. A more tangible 



