Arnica. COMPOSITiE. 451 



ovate, acute, serrate-toothed, veiny, partly clasping; heads 3-5; scales of 

 the involucre linear-lanceolate, acuminate, sparsely hirsute; achenia hir- 

 sute. — Nutt.! in trans. Anier. phiL soc. I. c. 



Oregon, on rocks at the Falls of the Wahlamet, Nuttall ! — Ahout a foot 

 high ; the leaves, except the uppermost, much longer than the internodes, all 

 closely sessile, 1-2 inches long. Rays small. 



X Species unknown to us {corolla glabrous). 



8. A. obtusifolia (Less.): radical leaves pelioled, subspatulate, obtuse, 

 5-nerved, scabrous ; the cauline elliptical ; head solitary ; scales of the hir- 

 sute involucre exceeding the disk, oblong-elliptical ; corolla glabrous. DC. 

 I. c. — Less, in Linneea, 6. p. 238. 



Unalaschka, Chamisso. — Stem 6-12 inches high, more or less hirsute. 

 Heads as large as in A. montaua: rays sulphur-color, short. Anthers black- 

 ish. Less. 



9. A. Unalaschensis (Less. 1. c.) : radical leaves petioled, subspatulate, 

 obtuse, serrate towards the apex, very scabrous ; the cauline oblong-obovate ; 

 head solitary ; scales of the hirsute involucre exceeding the disk, linear-lan- 

 ceolate. DC. I. c. 



Unalaschka, Chamisso. — Stem 6 inches high, leafless and hirsute-villous 

 at the summit. Leaves quintupli-nerved. Heads as in the preceding ; the 

 rays deeper yellow. Less. 



167. LESSINGIA. Cham, in Linncea, 4. p. 203, t. 2, /. 2 ; Less. syn. 

 p. 388, /. 17 ; DC. prodr. 5. p. 351. 



Heads many-flowered, homogamous ; the marginal flowers larger and ra- 

 diatiform, obconical, deeply 6-lobed ; those of the disk cylindrical-tubulose, 

 5-toothed. Involucre imbricated. Receptacle naked. Stamens and styles 

 included. [Branches of the style tipped with a dense tuft of rather rigid 

 hairs.] Achenia compressed, not beaked, silky-villous. Pappus a single 

 series of scabrous reddish somewhat rigid capillary bristles. — A procumbent 

 branching annual [tomentose and canescent when young], at length some- 

 what glabrous. Leaves alternate, thickish ; the lowest pinnatifid, the upper 

 toothed at the apex. Heads solitary, terminal and alar. Flowers yel- 

 low. D C. 



L. Germanorum (Cham. 1. c.) — Hook. <^ Arn. hot. Beechey, suppl. 

 p. 351. 



California, Chamisso, Douglas. — Plant with the aspect of an Asterea, but 

 with the style of Senecionese. The specific name ought perhaps to be changed 

 to Californica. 



Tribe V. CYNARE^. Less. 



Heads homogamous or heterogamous, sometimes dioecious. Style 

 in the perfect flowers often nodose-thickened near the summit (some- 

 times peniciliate at the node) ; the branches either distinct or con- 

 creted, puberulent externally ; the stigmatic lines reaching their apex, 

 where they are confluent. 



