77 



()I>s()k-tc (111 each c:;rpL-l : oil-lulics (S on llie coinmissmal sitic: 

 caip()i>li()ic free. 



"Plains of Uio Platte, near the K(..-ky Mountains" iXidliilh. 



In the type specimens of this uncertain species tlio fruit, u[ton whitli 

 its specific rank cliielly depends, has disappeared. It closely resembles 

 low forms of r. f/?()//(<'((//M.s, but difl'ers from that species in its free per- 

 sist(>nt carpophore, small invohicel bractlets, and few rays, besides the re- 

 markable fruit characters described by Nuttiill. Specimens collected by 

 1^. L. Greene, in ISTU, on the plains near Denver. Colorado, and liy Prof. 

 T. C. Porter, in ls71, near Cheyenne, Wyoming Territory, all in llower, 

 have been leferred to this species, correctly so. it nmy be. However, they 

 are somewhat larger, the bractlets are larger, thougli much smaller than in 

 ('. (jlomiratuH, and there is an elongated subterranean caudex from a deep- 

 seated fusiform root. Mature fruit alone can certainly determine the rela- 

 tionship. 



Oil -tubes solitary in the intervals ( not known in i'. 

 nivalis). 



3. C. globosus Watson, Proc. Am. Acad. \i. 141. With 

 a \cr}- short stcn.i hearing' a few lea\ es and pcthincles ( "l to 4 

 inches high), ghibrous: leaves ghuicous, pinnate or bipinnate with 

 broadly oblong pinnatitid segments; ultimate divisions oblong, 

 entire or toothed, often cuspidate: rays and pedicels obsolete, the 

 Howers and fruit being in dense globose heads, and the involucel- 

 bractlets \ery much reduced or \vantiiig: fruit :{ to 4 lines long, 

 the 5 thickish carpel \vings appro\imatcl\- c(|ual, becomir.g nar- 

 rower towards the base of the fruit: oil-tubes 'ion the commissural 

 side, and a small one in each wing. ( 1" ig. 7S. ) — C. inoiitatius 

 Torr. .K: (iray, Pac. R. Rep. ii. PiO; Watson, King's Rep. v. 128, 

 in part. C nioiitanus., var. o^lolntsns Watson, 1, c. 124, excl. fruit. 



Northern Nevada, near Carson City (^7;v^■/(, Wdixiui). in the Goshoot 

 mountains ( Hcrkirith). near ICnipirc City t Joins), near Pyramid Lake 

 I Lrmiiiou). Fl. May and June. 



4. C. corrugatus Jones, Am. Xal. 1888, 978. Like the 

 preceding species, but leaves simpler, witli broader more obtusely- 

 toothed segments: ra\s 1 to (> line- long; iiuohicels \ ei\- \ariable, 

 of large or small oblong or lanceol; te bractlets more or less 

 united: fruit (immature) apparently identical in section, the young 

 wings very much wrinkled. 



Nevada, in the region of Humboldt Lake, June, 1hs2 {Jdhih :5,sS(;). 

 •hnnH \^\'^\. from Jual) and Sioux Uriilge. Utah, dislrilnitcd as ('. Fmdliti, 



