﻿Nelson : New Plants from Wyoming 375 



Seemingly very rare ; observed in but one locality, a dry, stony 

 canon near Rock Springs. Collected first by the writer, but the 

 excellent specimens, which are taken as the type, were secured by 



Robert Smith, Jr., from the same locality July 25, 1897, 



no. 3595. 



Angelica ampla. 



Perennial, glabrous, stout, main stem often 5-7 cm. in diam- 

 eter at the base, freely branched above, giving to the plant a large 

 hemispherical head, 1.75-2.25 m. high ; stems and branches pur- 

 plish : leaves large, the lower (including the long petiole) from .75 

 -1 m. in length, twice -pinnate, i. e. t the leaf is divided into 5-7 leaf- 

 lets each of which is again pinnately divided into 3-7 parts which 

 may be sessile or petiolulate, and simple or 2-3-cleft or parted ; 

 the upper leaves correspondingly smaller and inclined to be ter- 

 nate-quinate ; the dilated sheathing base of the petioles ample, 1- 

 3 dm. long ; leaflets ovate, obovate or broadly elliptic, 5-25 cm. 

 lo ng, acute or short-acuminate, irregularly serrate, the serrations 

 cuspidate-pointed : peduncles axillary and terminal, elongated ; 

 rays numerous, 40-50, stout in fruit, 6- 10 cm. long, glabrous or 

 closely puberulent ; pedicels very numerous, 10-12 mm. long : in- 

 volucre and involucels none : flowers white : fruit oblong, 5 mm. 

 Jong, 4 mm. broad, wings narrow, about one-sixth the total 

 breadth of the seed, of medium thickness, slightly thickened on 

 edges ; dorsal and intermediate ribs nearly similar, rather thin, not 

 conspicuous: oil tubes small, contiguous, numerous, about 12 on 



the dorsal side and about 8 on the commissure : seed concave on 

 the face. 



A striking plant of rare occurrence ; it loves stream banks 

 where the isolated individuals occur in the openings among the 



's. It was first collected in 1896 on Sand Creek, near the 

 Colorado line, the specimens being distributed as A. Lyallii Wats., 

 Under n O- 2046. Collected again in 1 897 on the Laramie River. 

 ne ar Jelm mountain, no. 3460. 



Though first supposed to be A. Lyallii, it differs from that in 

 lts greater size, the longer rays of the umbel and especially in the 

 narrowly winged carpels, the numerous small oil tubes and the con- 

 c ave face of the seeds. In A. Lyallii the wings are as broad as 

 the body of the seed, the oil tubes large and only one in the inter- 



s ' tnc face of the seed plane or convex. 

 J t may be further pointed out that all the stations from which 



willow 



