Ch^nactis. COMPOSITiE. 371 



segments 3-5, narrowly linear, entire ; the uppermost leaves linear and en- 

 tire ; rav-flowers tubulose-infundibuliform, somewhat irregular, scarcely ex- 

 ceedingthe disk. — DC. ! prodr. 5. p. 659. 



California, Douglas I—Pinnt 8-12 inches liigh ; the naked summit of the 

 branches often 6 inches long. Involucre very woolly when young. Flowers 

 light yellow. Lobes of the leaves one-half to one inch long. 



4. C. stevioides {Rook. 6c Am.) : annual, somewhat glabrous; stem co- 

 rymbosely branched ; leaves somewhat woolly when young, pinnately di- 

 vided ; the divisions linear, obtuse, entire, or sometimes pinnatifid ; involucre 

 glandular-puberulent ; flowers white or flesh-color ; those of the ray tubu- 

 lose-infundibuliform, scarcely irregular, about the length of the disk. — Hook. 

 Sf Am. ! hot. Beechey, suppl. p. 353. 



Interior of Oregon, in the Snake Country, Mr. ToZmie /—Plant 3-5 inches 

 high. Heads smaller than the precedinff. Scales of the involucre broadly 

 linear. Pappus of 4-5 scales. Peduncles short. Upper leaves entire. 



§ 2. Floivers pale rose or flesh-color ; those of the ray infundibuliform or ex- 

 panded at the suinmit, regular, not longer than the others: achenia villous- 

 hirsute: pajjpus of 8-12 scales, in the disk oblong-linear, scarcely shorter 

 than the somewhat glandular corolla, in the ray much shorter, obtuse. — 

 Macrocarphus, Nutt. 



5. C. achillecefolia (Hook. & Arn.) : tomentose-canescent ; stems low, co- 

 rymbose at the summit ; leaves pinnately divided ; the divisions crowded, 

 linear or oblong, obtuse, mostly jjinnatifid. the lobes very small ; scales of 

 the somewhat obconical involucre pubescent or tomentose; achenia hirsute ; 

 scales of the pappus in the disk-flowers linear, acutish, nearly the length of 

 the corolla.— i/oo/v. 4* ^rra..' hot. Beechey, suppl. p. 354. Macrocarphus 

 achilleaefolius, Nutt..' I. c. 



Dry plains, interior of Oregon, (Snake Country) Mr. Tolmie .' to the 

 Rocky Mountains on the Colorado of the West, Nuttall ! July-Aug.— (2) 

 Stems several from the same root, 4-6 inches high. Leaves somewhat gla- 

 brous when old, densely woolly-canescent when young. Heads as large as 

 in C. Douglasii, to which it is very closely allied. 



6. C. Douglasii {Hook. &c km.) : loosely tomentose ; stem corymbose at 

 the summit ; leaves pinnately divided ; the divisions scattered, linear or ob- 

 long, obtuse, sinuate-toothed or pinnatifid; the lobes minute ; scales of the 

 hemispherical involucre glandular-pubescent (when young tomentose) ; ache- 

 nia hirsute-villous; scales of the pappus linear-oblong, truncate. — Hook. Sf 

 Arn. ! I. c, under C. achillefefolia. Hymenopappus Douglasii, Hook. ! ft. 

 Bor.-Am. 1. p. 316; Nutt. ! in jour. acad. Philad. 7. p. 30 ; DC. ! prodr. 

 5. p. 658. Macrocarphus Douglasii, Nutt. ! in trans. Amer. phil. soc. I. c. 



Dry barren soil, interior of Oregon ! and Rocky Mountains ! July-Aug. 



(D Stems 1-3 feet high, fastigiate, somewhat glabrous when old. Heads 



half*an inch in diameter. Papp'us silvery; the scales toothed or lacerate at 

 the apex ; in the disk-flowers shorter than the corolla. 



Subdiv. 2. EuHELENiE^.— Branches of the style in the disk-flowers obtuse or 

 truncate, or tipped with a cone, pubescent or barbellate at the apex. 



118. HYMENOPAPPUS. L'Her. ; Cass. ; DC. prodr. 5. p. 658. 



Heads many-flowered ; the flowers all tubular and perfect, similar and 

 regular. Scales of the involucre 6-12, somewhat in 2 series, oval or ob- 



