166 
BOTANY. 
leaves ovate in outline, 1-1 J' long, minutely strigose, bipinnatifid, the seg- 
ments oblong or linear ; heads in panicled racemes ; fertile ones with sev- 
eral strong flattened prickles ; sterile ones with a 5-8-cleft involucre and 
10-20 flowers ; chafi' of the sterile receptacle small and inconspicuous. — An 
unsightly weed. Saskatchewan to California, and eastward to Colorado and 
New Mexico ; Steamboat Springs, Nevada, (Bloomer.) From the Sierras 
to Great Salt Lake ; 4-6,000 feet elevation ; August-October. (591.) 
Hymenoclea^ monogyra, T. & a. PI. FendL, jy. 79. Leaves 1-2' 
long, entire or with a few distant divisions, the divisions, hke the leaves, 
fihform ; fertile involucres turbinate-fusiform, bearing near the middle a sin- 
gle whorl of broadly obovate scales ; the apex tubular and moderately elon- 
gated.— Plant 2-5 liigh, having the look of an Artemisia; the ripened fruit 
silvery-scarious. California to New Mexico and Sonora. Foot-hills of Vir- 
ginia Mountains, near the Truckee River ; 4,500 feet altitude ; May. (592.) 
Xanthium steumarium, L., Var. echinatum, Gray. Manual, ed. 5, p. 
252. Atlantic coast, and along the Great Lakes ; New Mexico and Califor- 
nia. Truckee bottom, Nevada, and Promontory range, Utah ; 4,500-5,500 
feet elevation ; July-October. (593.) 
Wyethia" amplexicaulis, Nutt. Smooth throughout and glutinous or 
resinous ; stems 1-2° high from a stout but scarcely woody root, leafy, 
usually Ijearing 3-5 heads ; leaves broadly oblong-lanceolate, entire or serru- 
late ; the radical ones often 1° long and 2-3' broad, petioled ; the cauline 
successively smaller, sessile, often somewhat clasping ; involucre 9-15" broad, 
the glabrous subequal scales as long as the disk, the outer ones oblono- 
6' 
1 IIY]MEN0CEEA, T. &. G., I e. Heads of two sorts, clustered in the axils of the upper leaves the 
fertile ...u s b. low ilio sin il... Fertile heads with an oboYoid closed coriaceons one-celled and one-flmv- 
ered nnoluciv. wl.u-li ^yhon mature has the sides winged with a circle or spiral of broad scarious append- 
a-..s. representing the dilated tips of the involncral scales, the apex of the involucre conical tubular 
p..inted. Stei lb- beads .VD-'.hed, ir)-'>0- flowered ; the receptacle small, hearing small obovate or spatu- 
late rlaweu s, n. ...ns vhr.u, nearly as long as the funnel-shaped or goblet-shaped 5-toothed corolla • an- 
tbyi s with a small inllrx. d drltoid appendage—Glabrous much-branched shrubby plants, with alternate 
n!;^N;-;d;^'A^^n,;^x;;;^^I:^e^ 3-5-divided. Genus of two species only, natives of Califor- 
W YKTFI [A. Xi-TT. Heads many-tlowered, radiate ; the rays very large, pistillate, fertile : disk- 
flo^tel■s nnmeron. tu!m,.r. ampliated near th. base, five-toothed. Scales of the campannlate involucre 
imbneatrdm- , ) subequal, the ont^n- ones equaling or exceeding the disk, foliaceons, the inner 
om.s narrow ^nu i,gnl Leeeptaele slightly convex, the lanceolate acuminate carinate chartaceons 
clniil as long as the d,sk-l!,..v,.rs and .lightly inclosing them. Branches of the style of the disk-flowers 
linear-elougat. t the ray glabrons. Aebenia elongated, flattened, somewhat 4-5-an- 
gle.l ana piiMi, . ;. Tappus conmirorm, rigid, tiie teeth short and erose or denticulated 
one or more of thom o.ren pn.huM.l into awr,s._c..arse perennial herbs, often resinous or balsamic, with 
ample nearly (miire leaves, and large sninlower-like yellow heads, either solitarv and terminal, or few 
on axillary pediineb's : natives of North America fn.m Oregon to New Mexico. " 
