101 



with l()ii|4- liiislk's; sIlmu 1c;i\cs sessile, from l;iciiii:ilcl\ -toolhcd lo 

 piiuiately cut into liiic;;r-lanccol;ite cuspiihitc cliNisioiis: heads ovate 

 to oblong ( al)ont () lines long), witli inxolncic of numerous linear- 

 lanceolate entire to rcmotel}' toothed spiny-tipped bracts (whitish 

 within, green without) twice as long as the head; bractlets subu- 

 late, rigid, spiny-tipped, longer than the Howers, the terminal ones 

 verv prominent and crowning the head: fruit half a line long, with 

 short ovate mucronatc calyx-lobes, ;>.!id shoit 8t\les. 



Hills and plains, E. Toxas (//f(?0, New Mexico ( t»'//V//i/i, aiiH Aii/.oiia 

 ( Lemmnu): extending also into Mexico. Fl. August. 



20. E. diffusum Torr. Ann, Lye. N. \'. ii. 207. Stem about 

 a span high, diffusely brandling from the base, with thick rigid 

 branches: leaves sessile, palmately parted, coriaceous, midrib ver\ 

 prominent beneath and margins cartilagmous; segnients oblong, 

 inci,sely serrate and spinose: heads subglobose, about <> 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- 

 tiro, spinosely-tipped : fruit clothed with imbricated pointed scales, 

 less than a lir.e long, with ovate long-pointed calyx-lobes twice as 

 long as the fruit, and long styles: oil-tubes very large, 8 dorsal 

 and 2 commissural, more or less sunken in the somewhat dorsally 

 flattened seed: seed-face plane. 



Sandy plains, Arkansas, on tlie Canadian Kivor {Jumcs). Wichita Mts 

 ( 7ViMr6e»-. in Marcy's Exped.); Texas (Up nrr lion :i">(i), and extending into 

 Mexico. 



An excellent figure of this rnre plant is tc bo found in Marcy's Ke- 

 port, t 6. 



***** l^o-L\ sJcndvr^ niosily prostrate : leaves sniall^fi'iin 

 and iiiiarnieJ : heads very small : southern. 



21. E. Baldwinii Spreng. Syst. i. S70. Prostrate, often 

 rooting at the joints, diffusely branched: lower leaves oblong, 

 usually long-petioled, from entire to laciniately toothed ; upper 

 leaves much snialler, 8-partc:l, tlie divisions from lanceolate t») 

 liliform, toothed or entire: heads usually narrowly oblong at 

 maturity ( about 8 lines long), witii involucre of subulate bracts, 

 and similar bractlets: fruit half a line long, with very jirominent 

 tubercles, ovate calyx-lobes shorter than the fruit, and styles a line 

 long; oil-tubes medium-sixed, 3 dors;d and 2 cnn-.missuial, with 



