1848.] 15 



length cernuus ; involucrate bractes 3-cleft, acute, appressed ; teeth of the iiivo- 

 liicriim acute ; flowers few and small ; segments of the perianth unJulated 

 Hab. On the plains of the Oregon and in the Rocky Mountains. (Nuttall.) 



E. *iiiicrotheca.. Suffruticose and dwarf; stems slender and clustered, at first 

 arachnoid tomentose ; leaves linear-oblong, nearly smooth above, whitely tomen- 

 tose beneath, shortly petiolate, the petiole widened at the ba^e ; umbel two or 

 three times di or trichotomous, each division bracteate ; the involucrum small 

 and distinct, pubescent, about G-flowered ; the teeth about six, ovate, obtuse; 

 flowers yellow, very small. 



Hab. On the sides of hills in Oregon, cast of Walla- Walla (Nuttall.) 



E. *cn)vpanufufui}i. Leaves all radical, clustered upon a thickish caudex, linear- 

 spathulate or narrowly oblong, narrowed below into longish petioles, whitely 

 tomentose on both surfaces ; scaj)es smooth and naked ; umbel about twice tri- 

 chotomous, few-flowered ; bractes acute, a little tomento.se on the margins ; in- 

 volucrum campanulate, about 6 to lO-flowered, smooth, with obtuse teeth; peri- 

 anth yellow, smooth. 



Hab. On the western declivity of the Rocky Mountains. (Nuttall ) 



E. *brevicauUs. Branches very short, arising from a woody caudex, clustered, 

 tomentose ; leaves linear lanceolate, long and rather acute, attenuated into a 

 very long petiole, whitely tomentose beneath, less densely above ; upper sea- 

 poid stem very smooth; the bractes acuminated, tomentosely margined ; umbe 

 two or three times compounded, with very long rays ; teeth of the canpanulate 

 involucrum acute; flowers smooth, yellow and very small. 



Hab. On the upper plains of the Oregon. (iXuttall ) 



E. *gyrophyUum. With a woody caudex ; lower leaves clustered towards the 

 base of the stem, oblong-lanceolate, acute, attenuated at the base, beneath to- 

 mentose and yellowish-white, above slightly pubescent and green; a verticel of 

 leaves on the stem, about 6, subsessile, oblong; umbel simple, of many short 

 rays, with a leafy, spreading involucrum, tomentose within and without, many- 

 flowered, shallow and simple, with longish, reflected teeth ; perianth smooth, 

 exserted. 



Hab. Kocky Mountains of the Platte. (Nuttall.) 



E. *angiistif(iUuiii. SuflVuticose. with infertile branches towards the base; 

 leaves fasciculated and verticillated, linear-acute, narrowed below, whitely to- 

 mentose beneath, greenish but pubescent above, a verticel of about six leaves on 

 the short stem ; umbel simple, subtended by long, leafy bractes ; divisions of the 

 many-flowered involucrum reflected, pubescent; perianth reflected, smooth. 



Hab. Western slope of the Kocky Mountains. (Nuttall.) 



E. *effusum. Suffruticose ; leaves linear, oblong, obtuse, beneath whitely 

 tomentose, above pubescent, greenish ; stem tomentose, two oi three times tri- 

 chotomous, divaricate ; bractes ternate, lanceolate-acute ; (flowers not seen.) 



Hab. In the Rocky Mountains. (Nuttall.) 



E. *micranfhum. Leaves nearly all radical, arising from a thickish, woody 

 caudex, linear-spathulate, or narrowly oblong lanceolate, narrowed below into 

 longish petioles, whitely tomentose on both surfaces; scapes, bractes and invo- 

 lucres tomentose ; umbel decompound, pedicels of the second divisions very 

 short, with about three involucres in each; bractes acute or acuminate ; invo- 



