174 
BOTANY. 
(Bloomer !) Mountains of Nevada, from the Pali-Ute to the East Hum- 
boldt Ranges ; 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.) 
BuRRiELiA^ NiVEA. Minute, barely 1' high, densely covered with white 
wool ; leaves obovate-spatulate ; heads solitary on short slender peduncles, 
2^-3'Mong; involucre of about 8 oblong obtuse scales, smooth within, at 
length reflexed and showing the hemispherical receptacle ; rays 8-9, obovate, 
scarcely exceeding tlie involucre, hairy along the tube, and 2-3-toothed at 
the apex; disk-flowers G-8, half shorter than the rays, corolla somewhat 
expanded at tlie throat ; anthers slightly sagittate, the terminal appendage 
ovate ; style of tlie disk-flowers with the oblong branches tipped with a short 
obtuse barbellate appendage ; achenia obovate-oblong, compressed, villous- 
cihate along the thiclcened margins, otherwise smooth ; paj^pus of 2 concave 
long-avvned ovate denticulate hyaline 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 httle in having a convex and not conical receptacle and in the 
pappus. Baliia Wallacei and B. ruhella are other plants much resembling 
this, but the achenium and pappus are very diflferent. Foot-hills of AVestern 
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. Csospitosc, dwarf and acaulescent, viUous- 
pubescent or silky; caudex peremiial, simple or branching; leaves all radical, 
>IU-RRIi:LrA DC, (i,.cluding Dklwla, Nutt.) Heads few-many-flowored, radiate; rays 3-13 
I.isr> lat.>, t.rtd. : d..sk-flower.s tubular, perfVer : the corollas with au expanded 5-lobed or 5-tootbed limb 
Involucre bennsph..ru al or c.yupauulat., th. s,.uh..s u.u.lly as many as the rays, oval or oblong, about 
as ..no; as the <li.sk. Leceptacle conical or convex, papillose or with toothed alveoli. Branches of the 
8 yle trun. arc and nunutely barbellate, or terminated by a very short conical appendage. Achenia 
obconic or Insitorm, quadrangular, or somewhat compressed. Pappus of 2-5 lanceolate or subulate awns 
often with sevei-al obtuse lacerate scales between the awns, but in one species the pappus is wantin<..J 
Annual mostly Cal.forn.an herbs, often very small, with opposite leaves and commonly solitary heads of 
yellow flowers. 
