WESTERN SPECIES OF ARABIS. 73 



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in certain species which verge toward the A, platyspcrma 



group. Their flowers are apt to be larger than in other and 



>p taller species, and are perhaps always of a deep red-purple, 



not so very unlike those of the y^. Brcweri group. Their pods 

 are many, and are usually almost horizontally spreading and 



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secund ; in this particular most unlike A. Breweri. 



Arabis oreocallis. Low subalpine multicipitous peren- 

 ; nial, the partly hypogeous branches of the caudex short, stout, 



covered below the living foliage by the imbricated persistent 

 bases of the leaves of former seasons, the whole plant 4 or 5 

 inches high and grayish : basal leaves Y^ inch long or more, 

 the obovate acute entire blade tapering abruptly to a broad 

 petiole of its own length, both faces minutely and not very 



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densely stellate ; cauline leaves uncommonly many and well 



developed, approximate, large for the plant, spatulate-obovate 



to oval and narrower, sessile, obscurely auricled, greener than 



^ the basal, only sparingly stellate : raceme in flower short and 



corymbiform ; sepals purplish-green and with few or no stel- 

 late hairs, always with a narrow purple-scarious margin ; 

 petals broad, obtuse, of a rich purple : pods (immature) few, 

 short, narrow. 



Collected in the Selkirk and Rocky Mountains, B. C, at 



7,000 feet, by C. H. Shaw, July, 1904. 



Arabis bracteolata. Multicipitous dwarf 3 or 4 inches 

 high, the basal leaves in small rosettes, with distinctions of 

 obovate or oval blade and broad petiole not strongly marked, 

 the leaf as a whole only /^ to /4 inch long, densely and can- 

 escently stellate : flowering stems slender, their leaves sessile 

 and in the form of ovate-sagittate bracts less than % inch long, 

 glabrous, glaucous : flowers unknown : pods only 2 to 4, about 

 1 inch long, a line wide, obtuse, slightly arcuate and spread- 

 ing, the valves thin, nerveless : seeds in 1 row, rather thick, 



/ short-oval, not winged, though with traces of a narrow scar- 



li ious margin. 



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