﻿New Plants from Wyoming.— III. 



By Aven Nelson, 



Arabis Brebxeriaxa. 



Perennial, the strong vertical taproot surmounted by a short 

 crown, stems single (sometimes I or 2 small accessory ones di- 

 vergent from the base) ; main stem excurrent, the few slender 

 branches paniculate, canescent : basal leaves rosulate, entire or 

 obscurely dentate, oblong to oblanceolate, 2-3 cm. long, whitish 

 with a dense branched pubescence, petioles short or margined ; 

 cauline leaves auriculate-clasping, dentate, oblong, obtuse, 2-3 cm. 

 long, less densely pubescent than the basal leaves : raceme panic- 

 ulate, leafy-bracteate below, bractless above, pubescence becoming 

 sparser upwards, almost absent on pedicels and altogether on the 

 pods : flowers very small : sepals greenish, sparsely hirsute, thin, 

 veiny, oblong, obtuse, about 3 mm. long : petals white, broadly 

 spatulate with a narrow claw, about 4 mm. long : pods erect, 

 nearly cylindrical, 2-3 cm. long, less than 2 mm. in diameter ; 

 the suture of the valves distinct ; valves obscurely few-nerved ; 

 fruiting pedicels divaricate-ascending, 5- 10 mm. long: seeds in 

 two rows, numerous, crowded, ovate or elliptic, wingless. 



I dedicate this to Miss Margaret Brebner who first collected 

 rare species near Laramie, June 6, 1897. It was secured by 

 the writer at Fort Steele, on the Platte during the same month, 

 °ut in both localities it seems to be a very rare and scattering 

 plant. It occurs on grassy slopes and bottom lands the soils of 

 *hich are slightly saline. 



Type specimen in Herb. Univ. of Wyoming, no. 3135. 



« 



VlCIA CAESPITOSA. 



Perennial from slender" matted rootstocks ; stems numerous, 

 spreading, striate, loosely and crisped hairy, 6-12 cm. long, form- 

 In g dense mat-like patches I m. or more across: leaflets 3-5 

 j )ai rs, pubescent, sparsely so above, more closely below with short, 

 Joose and crisped hairs, nearly sessile, oblong, subcuneate at base, 



lie obtuse apex apiculate, quite constant in shape, 10-15 mm. 



° n g. 3-4 mm. wide, firm in texture, conspicuously veined ; 

 st 'Pules half sagittate, the acuminate apex incurved, the short base 

 us ually curved and rarely dentate ; peduncles equaling or exceed- 



(373) 



this 



