12G Nelson : New Plants from Wyoming 



alum Gray, except in the petals. Its bushy-branched habit ancf 

 biennial duration easily distinguish it. It is common throughout 

 the Red Desert region of Southern Wyoming wliere it was first' 

 observed in 189;. Closer examination in 1898 shows that it is 

 exceedingly abundant and remarkably uniform in size and habit. 

 Type specimen in Herb. University of Wyoming, no. 4682 



J 



Wyomin 



Biennial or possibly of longer duration : stems single or more 

 often several from the crown, each usually somewhat branched, 

 2-5 dm. high (including the raceme), glabrous or nearly so 

 throughout: leaves numerous, the radical laciniate-toothcd, ob- 

 ovate on short margined petioles, early deciduous the second 

 season ; cauline (all except the lowest) clasping-auriculate, the 

 lobes comparatively large and rounded, somewhat glaucous, the 

 lowest coarsely dentate or nearly entire, oblong, 4-7 cm. long, the 

 upper entire, gradually smaller upward : flowers large, ebracteate, 

 congested during anthesis : calyx subcyhndric; sepals oblong, 5 

 ihm. long, petaloid, midvein greenish, especially toward the tip : 

 petals white, sometimes tinged with pink as are the sepals, 10-12 

 rnra. long, claw narrow, the limb spreading, nearly o\aI : stamens 

 distinct, anthers nearly equaling the filament : pods slightly flat- 

 tened, very variable in length, sometimes nearly 10 cm. long, only 

 1-1.5 mm. in diameter, erect or spreading, usually somewhat curved, 

 on short (8 nmi. long), stout, divaricate pedicels : stigma nearly 

 sessile, 2-lobcd : cotyledons accumbent. 



A very distinct species of the dry desert region of south - 



central Wyoming where it occurs mostly as scattering specimens. 

 Three collections of it have been secured, viz., at Green River in 

 1897, no. 3034; near the same place in 1898, no 4722, and at 

 Tipton, no. 4787. Plants are in their prime during the first weeks 

 of June, which must be considered early in the season at this high 

 altitude. 



r 



Thelepodium paniculatum 



Perennial, glabrous and somewhat glaucous throughout : tap- 

 root woody, vertical, usually simple : rootlets few to numerous, 

 spreading : stems single, rarely 2 or more from the crown, simple 

 below, at length paniculatcly branched above : radical leaves ob- 

 long, acute, tapering gradually to both base and apex, very short 

 petioled, 2-6 cm. long: cauline sagittate-clasping, auricles short. 



