238 COMPOSITE. Stenotus. 



those of the simple scape 1-2 ; scales of the involucre roundish-oval, very 

 obtuse, coriaceous, with abrupt scarious margins, closely imbricated some- 

 what in 3 series ; style with short and thick lanceolate appendages. 



On shelving rocks towards the sources of the Platte, Nultall ! — Plant a. 

 span high, with the asiject of an Armeria. Leaves very rigid,_ pale or whi- 

 tish, but shining, 3 inches long, not 2 lines wide, sometimes a little resinous, 

 as well as the rigid rounded scales of the involucre. 



4. S. cfesjntosus (Nutt. ! 1. c.) : glabrous or nearly so ; leaves crowded at 

 the summit of the woody caudex, narrowly lanceolate or linear, acute, 

 3-nerved; those of the simple or branching scapes 3-4 ; scales of the invo- 

 lucre broadly ovate, acute, membranaceous, erose-ciliate, imbricated in 3 

 series; appendages of the style subulate-linear, minutely pubescent. — Chry- 

 sopsis csespitosa, Nutt. ! in jour, acacl. Philad. 7. ^i. 33. 



Vallies of the Rocky Mountains, towards the sources of the Missouri and 

 Platte, Mr. Wiieth ! Nutiall ! July.— Plant 4-6 inches high. Leaves per- 

 fectly smooth and glabrous, or with a few scattered hairs. 



§ 2. Leaves crowded on the somewhat ligneous branching flowering stems, 

 often covered with a resinous exudation: rays 12 : ])<^I'I>^^ «'*^ ^^^Ml ^'"^^^ 

 of the achenia bright white. 



5. S. linearifolius : glabrous, much branched ; the branches naked and 

 pedunculiform at the summit ; leaves narrowly linear, acute, 1-nerved, 

 glandular-punctate ; scales of the glabrous involucre lanceolate-oblong, acute, 

 somewliat membranaceous, with broad scarious margins, in 2 series, some- 

 what equal, the inner as long as the disk ; appendages of the style ovate, 

 thickened, much shorter than the linear stigmatic portion.— Aplopappus 

 linearifolius, DC. ! prodr. 5. p. 347 ; Hook.! Sf Arn. ! hot. Bcechey, suppl. 

 p. 350. 



Cahfornia, Dowfl^as/— Leaves an inch or more in length. Head nearly 

 an inch in diameter; the involucre looser than in the preceding. 



6. S. florifer : stem rather short, branched, hairy ; leaves all linear-spatu- 

 late, slightly hairy, entire, glaucous ; heads sohtary, terminating the pedun- 

 culiform branches ; exterior scales of the involucre pubescent-hirsute ; the 

 interior membranaceous, fimbriate-ciliate ; rays rather broad, spreading, 

 twice the length of the involucre ; bristles of the pappus very white. Hook. 

 —Aplopappus florifer. Hook. Sf Am. hot. Beechey, suppl. p. 351. 

 Erigeron ? florifer, Hook. fl. Bor.-Am. 2. p. 20. 



p. leaves obovate-spatulate. Hook. <^" Am. I. c. 



Dry rocks and sandy grounds, near Priest's Rapids of the Oregon, and 

 Lewis & Clarke's River, Douglas ! /3. Snake Country, Mr. Tohme.—Smd. 

 to be very nearly allied to A. linearifolius, but with different foUage. The 

 description does not satisfactorily accord with any of the preceding ; and the 

 following exhibits a tawny or ferruginous pappus in the youngest state, &c. 



§ 3. Flowering stems somewliat leafy, hearing 1 to 3 ohovoid fewer-flowered 

 heads : rays 8 : 2^c-PP^^ fi'^^S^'^'^'"-^' (Oonopsis, Nutt.) 



7. S. nmlticaulis (Nutt. ! 1. c.) : flowering stems numerous from a woody 

 caudex, simple or somewhat branched, tonientose-cinereous (as well as the 

 leaves and involucre) when young, at length nearly glabrous ; leaves linear, 

 l-nerved ; the lowest subspatulate-linear and obtuse ; those of the flowering 

 stems 3-5, acute ; heads b'racteate or subtended by a leaf; scales of the invo- 

 lucre ovate, acuminate, membranaceous (6-9), in 2 series ; appendages of 

 the style linear-oblong. 



