J 74 BOTANY. 



(Bloomer !) Mountains of Nevada, from the Pah-Ute to the East Hum- 

 boldt Kanges; 5,500-9,500 feet elevation; June-August. Plant not so 

 white as Brewer's Californian specimens, the very numerous stems often a 

 foot or more high. (613.) 



BuERiELiA^ NivEA. Miuuto, barely 1' high, densely covered with white 

 wool ; leaves obovate-sp.atulate ; heads solitary on short slender peduncles, 

 2^-3" long; involucre of about .8 oblong obtuse scales, smooth within, at 

 length reflexed and showing the hemispherical receptacle ; rays 8-9, obovate, 

 scarcely exceeding the involucre, hairy along the tube, and 2-3-toothed at 

 the apex ; disk-flowers 6-8, half shorter than the rays, corolla somewhat 

 expanded at the throat ; anthers slightly sagittate, the terminal appendage 

 ovate ; style of the disk-flowers with the oblong branches tipped with a short 

 obtuse barbellate appendage ; achenia obovate-oblong, compressed, villous- 

 ciliate along the thickened margins, otherwise smooth ; pappus of 2 concave 

 long-awned ovate denticulate hyahne scales. — In appearance much resem- 

 bling B. lanosa, but differs in the broader leaves, the simple pappus, and 

 especially in the curiously 2-ridged achenium. From the character of DichcBta 

 it recedes a little in having a convex and not conical receptacle and in the 

 pappus. Bahia Wallacei and B. rubella are other plants much resembling 

 this, but the achenium and pappus are very diiferent. Foot-hills of Western 

 Nevada, from the Virginia to the Pah-Ute Mountains ; 4-5,500 feet eleva- 

 tion ; May, June. Plate XVIII. Fig. 6. A plant ; natural size. Fig. 7. 

 Ray-flower ; magnified six diameters. Fig. 8. Pappus-scale ; magnified 

 twelve times. Fig. 9. Section of achenium ; magnified eighteen times. 

 Fig. 10. Style ; magnified twelve times. Fig. 11. Corolla of disk-flower. 

 Fig. 12. Same laid open and all but one stamen removed; magnified six 

 times. Fig. 13. Stamen. Fig. 14. Style; each magnified twelve diame- 

 ters. (614.) 



AcTiNELLA ACAULis, Nutt. CsBspitose, dwarf and acaulescent, villous- 

 pubescent or silky; caudex perennial, simple or branching ; leaves all radical, 



1 BUREIELIA, D C, (including Dickceta, Nutt.) Heads few-many-flowered, radiate; rays 3-13, 

 pistillate, fertile ; disk-flowers tubular, perfect ; tlie corollas witli an expanded 5-lol)ed or 5-toothed limb. 

 Involucre hemispherical or oampanulate, the scales usually as many as the rays, oval or oblong, about 

 as long as the disk. Receptacle conical or convex, papillose or with toothed alveoli. Branches of the 

 style truncate and minutely barbellate, or terminated by a very short conical appendage, Achenia 

 obconic or fusiform, quadrangular, or somewhat compressed. Pappus of 3-5 lanceolate or subulate awns, , 

 often with several obtuse lacerate scales between the awns, but in one species the pappus is wanting. — 

 Annual, mostly Californian herbs, often very small, with opposite leaves and commonly solitary heads of 

 yellow flowers. 



