101 
a 
with long' bristles; stein leaves sessile, from laciniately-toothecl to 
piiinately eut into linear-lanceolate cuspidate divisions: heads ovate 
to oblong (about 6 lines long), wkh involucre of numerous linear- 
lanceolate entire to remotely toothed spiny-tipped bracts (whitish 
within, green without) twice as long as the head; bractlets subu- 
late, rigid, spiny-tipped, longer than the flowers, the terminal ones 
very prominent and crowning the head: fruit half a line long, with 
short ovate mucronate calyx-lobes, and short styles. 
Hills and plains, E. Texas {Hall), New Mexico {Wright), and Arizona 
{Lemmon); extending also into Mexico. El. August. 
20. E. diffusum Torr. Ann. Lyc. N. Y. ii. 207. Stem about 
a span high, diffusely branching from the base, with thick rigid 
branches: leaves sessile, palmately parted, coriaceous, midrib very 
prominent beneath and margins cartilaginous; segments oblong, 
incisely serrate and spinose: heads subglobose, about 6 lines long, 
on very short peduncles in the forks of the stem, with involucre of 
leaf-like bracts longer than the head, and bractlets lanceolate, en- 
tire, spinosely-tipped : fruit clothed with imbricated pointed scales, 
less than a line long, with ovate long-pointed calyx-lobes twice as 
long as the fruit, and long styles: oil-tubes very large, 3 dorsal 
and 2 commissural, more or less sunken in the somewhat dorsally 
flattened seed: seed-face plane. 
Sandy plains, Arkansas, on the Canadian Eiver {James), Wichita Mts- 
{Thurber, in Marcy’s Exped.); 'r exas {Rever chon 35(1), and extending into 
Mexico. 
An excelient figure of this rare plant is to be found in Marey’s Re- 
port, t 6. 
***** Z.ow, slender, mostly j)rostrate : leaves small, thm 
and unarmed: heads very small : sotdheri'i. 
21. E. Baldwinii Spreng. Syst. i. 870, Prostrate, often 
rooting at the joints, diffusely branched : lower leaves oblong, 
usually long-petioled, from entire to laciniately toothed; upper 
leaves much smaller, 3-parted, the divisions from lanceolate to 
filiform, toothed or entire: heads usually narrowly oblong at 
maturity (about 8 lines long), with involucre of subulate bracts, 
and similar bractlets: fruit half a line long, with very prominent 
tubercles, ovate calyx-lobes shorter than the fruit, and styles a line 
long: oil-tubes medium-sized, 3 dorsal and 2 commissural, with 
