•248 Nelsox: New Plants from Wvomixg 



mamoenus 



Cacspitose, the roots iiuhierous. one or more short tap-roots 

 and many fibrous ones : caudex of few to many short crowded 

 branches : leaves numerous, fascicled on the crowns, Hnear-spatu- 

 latc, pubescent with short, stiffish liairs, 2-4 cm. long, including 

 the slender, ciliolatc petiole which is nearly twice the length of tlie 

 blade: stems scapose, pubescent, 5-10 cm. long, the 3-5 ba.sal 

 leaves not apparent as they are concealed by the similar fascicled 

 ones of the crowns, a single bract on the monocephalous pedun- 

 cles : involucre broad-campanulatc, about 6 mm. high, ciliolate- 

 pubcscent ; bracts linear, acuminate, with a dark green midrib and 

 scarlous margins : rays purple, 25 more or less, broadl)' linear to 

 oblong, the ligule 7-10 mm. long, the tube short : pappus bristles 

 slender, in one series, about equal : achcnes pubescent. 



' A beautiful species with a very characteristic root system and 

 large (for the plant) handsome heads of flowers. Secured but 

 once, when It was found in the greatest profusion, literally carpet - 

 hiG" the wliole rounded summits of low hills otherwise destitute of 

 vegetation. The soil (?) was a red clay and pebbles as large as 

 birds' eggs, mostl}' pebbles. Type specimen in Herb. Universit)' 

 of Wyominjj. no. 4680, Kemerer, June 13, 1898. 



Erigeron Wyomingensis 



Root nearly simple, woody : caudex multicipal, tlie branches 

 very short and crowded, covered with dead leaf-bases ; stems sim- 

 ple, numerous, one to several from each crown, rather closely pu- 

 bescent with spreading unequal hairs, leafy below, naked-peduncu- 

 late above, 7-15 cm. long : leaves crowded on the crowns, short 

 hirsute all over, the margins stongly hirsute-ciliate especially on 

 the peti(^les, linear-spatulate, on petioles exceeding the blades, 3-5 

 cm. long (including petiole): stem leaves several, similar but be- 

 coming smaller upward : peduncles naked or with a filiform bract, 

 monocephalous: heads large, including the spreading rays 20-25 

 mm, broad : involucral bracts narrow, in two rows, hirsute, long 

 acuminate, with a dark green midrib, half as long as the rays : 

 rays purple, 40-70, pappus of sparse, slender bristles, equaling 

 the numerous disk corollas and a close ring of short, unequal, 

 paleae-like hairs : achene pubescent, glabrate at maturity, oblong- 

 ^patulate, 2-3 mm. long. 



ubescencc of E. pumihts 



Nutt. but its smaller size, simple, less leafy stems, long peduncled 



heads and purple rays at once distinguish it. 



