72 LEAFLETS. 



tinged and with a few short substellate hairs ; pods lH to lj4 

 inches long, ascending on ascending pedicels, slightly curved, 

 a line wide as to the main portion, but distinctly narrower 

 toward the base, and at apex rostrate-acuminate : seeds rather 

 few, uniserial, the mature not seen. 



Mt. Grayback, southern Oregon, 15 June, 1904, C. V. Piper ; 

 specimens in U. S. Herb., under the collector's n. 6156. A 

 genuine ally of A . Breweri, but most distinct as to both foliage 

 and pods. 



Arabis polytricha. Perennial, a foot high, with one or 

 more upright stems from the tuft of basal leaves, the whole 

 plant pale and glaucous, but most parts also rather roughly 

 pubescent : basal leaves oblanceolate, entire, an inch long, 

 more or less canescent with a pubescence of two kinds, one set 

 of hairs (the principal one) 3-parted to below the middle, 

 others (chiefly marginal) longer, simple and setiform ; cauline 

 leaves many, an inch long or more, sessile, almost linear, 

 pubescent on both faces like the lower, shortly auricled ; short 

 pedicels of the long pods only bristly-hairy, some of the bristles 

 forked, but not deeply: pods nearly 4 inches long, barely a line 

 wide, strongly falcate-recurved, glabrous, glaucous, closely 

 lineolate, all immature but small seeds in one row. 



Hills east of Yreka, in extreme northern California, asso- 

 ciated with the somewhat rare Mirabilis Greetiei, according to 

 the collector, Mr. George D. Butler, who obtained the speci- 

 mens 8 May, 1909. The flowers are not known, but a calyx 

 or two that have remained as unexpanded buds show sepals 

 well beset with the forked hairs. Habitally this approaches 

 my A . campy loloba, but that and A . Breweri are in truth nearly 

 related. 



A group of low, often matted and many -stemmed species first 

 came into view when Sereno Watson published his A . Lemmoni. 

 Besides their low stature and multicipitous habit, they are 

 marked by uncommonly broad leaves, and are whitish, with 

 an unusually dense indument of stellate hairs, this less dense 



