WESTERN SPECIES OF ARABIS. 77 



strongly, even almost carinately, 1-nerved : seeds in two rows, 

 large, thin and flat, broadly winged on one or two margins, 

 sometimes all around. 



Crater I,ake, National Park, southern Oregon, 14 Sept., 

 1902, F. V. Coville, n. 1511 as in U. S. Herb. In general 

 appearance at first and superficial glance resembling A . suffru- 

 tescens, but examination revealing an array of very pronounced 

 characters. 



Arabis arbuscula. Plant a foot high, the slender flower- 

 ing stems supported by a much branched woody and leafy 

 caudex 4 or 5 inches high : leaves of the basal woody branches 

 /{ to }i inch long, oblanceolate, acute, entire, canescent with 

 sessile stellate hairs, some longer and merely forked ones inter- 

 mixed, the few cauline oblong-linear, very acute, but at base 

 abruptly widened and auricled, all nearly or quite glabrous : 

 flowers unknown, but pods only 1 to 4 at summit of axis, these 

 nearly 3 inches long, scarcely a line wide, rostrate-acuminate, 

 slightly falcate : seeds in one row, the mature not seen. 



Eight Dollar Mountain, in Josephine Co., southern Oregon, 

 C. V. Piper, 13 June, 1904 ; the collector's n. 5065 as in U. S. 

 Herb. Species most diflicult to place, the strongly developed 

 woody caudex pointing to the group of A. platysperma, while 

 the foliage is rather that of the yi. retrofrada alliance, the pods 

 as far from one as from the other. 



Arabis paupercui,a . l/ow subalpine perennial with several 

 more or less buried branches 1 to 2 inches high : leaves of sterile 

 shoots V-i inch long or more, of elliptic-lanceolate acute blade 

 and slender petiole of about equal length, glaucous, sparsely 

 stellate-pubescent : flowering stems scapiform, only 1 or 2 

 inches high exclusive of the pods, their 1 or 2 leaves sessile 

 but not auricled, obscurely stellate ; flowers unknown : pods 

 very few, IJ^ to 2 inches long, a line wide, linear, straight, 

 acute, strictly erect, mid vein of valves not prominent : seeds 

 in one row, oval, ovally winged, i. <?., the wing obsolete at 

 base of the seed, narrow at the sides, very wide at upper end. 



