WESTERN SPECIES OF AKABIS. 79 





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ern Oregon or northern California, the exact locality not 

 indicated. 



In foliage and pubescence much like my .-/. canipyloloba, 

 but as to fruit and seed widely different. 



Arabis hastatula. Perennial, a foot high, the several 

 stems slender, decumbent at base around a leafy central axis : 

 axial leaves 1 to 13^ inches long, very narrow, the lanceolate 

 acute blades not as long as the petioles, these dilated at base and 

 there with or without a long simple bristly hair or tw^o, other- 

 wise perfectly glabrous, light-green and glaucous ; cauline 

 leaves sessile by a hastately-auricled base, oblong, acute: 

 raceme few-flow^ered, flowers nodding on short pedicels ; calyx 

 dark-purple, of less than half the length of the purple petals : 

 pods (immature) filiform, straight, abruptly deflexed. 



Collected at an altitude of 6,000 feet in mountains of the 

 Imnaha National Forest, Oregon, 25 June, 1907, by A. W. 

 Sampson and Gustaf A. Pearson, Evidently allied to A. 

 retrofrada, but glabrous, or with none but simple hairs and 

 these only marginal. 



Arabis subserrata. Stoutish, biennial or perennial afoot 



high or more, usually without branches : earliest leaves not 

 seen, the lower cauline closely approximate, oblanceolate, 

 short-petiolate , acute , often saliently serrate-toothed , 1 % 

 inches long, of a pale glaucous green, also thinly and minutely 

 stellate, those at midway of the stem and upward oblong, 

 acute, sessile by a sagittate base, 1 inch long, sparsely stellate 

 beneath, glabrous and glaucous above; stem, also rachis of 

 raceme, glabrous, but pedicels and calyx with many mostly 

 ternate short hairs ; corolla nearly V^ inch long, rich purple : 

 pods 3>4 inches long, a line wide, glabrous, glaucous, usually 

 slightly curved, spreading: seeds in one row, suborbicular, 

 narrowly wnnged all around. 



Western Washington, at EUensburg and elsewhere in the 

 ^ same general region, collected in April and May, 1899, by 



Kirk Whited. 





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