414 



COMPOSIT.E. Senecio. 



14. S. aronicoides, DC. Loosely and somewhat hirsutely woolly when young, 

 glabrous when old : stem stout, a foot to a yard high, bearing numerous small heads 

 in dense compound cymose clusters : leaves oblong, varying to ovate or lanceolate 

 (3 to 5 inches long), irregularly and often coarsely toothed, or the lower cauline 

 sometimes laciniate-pinnatihd, the uppermost reduced to bracts : scales of the invo- 

 lucre lanceolate, acuminate, not black-tipped : rays none, or occasionally one or two 

 short ones: disk-tlowers 10 to 20. — .S'. exaltatus var. unijfoscidosus, Gray in Pacif 

 E. Kep. iv. 111. 



Low grounds, common about the Bay of San Francisco, the Geysers, &c. A dwarf and nearly 

 entire-leaved variety, around Lassen's Peak, Lemmon. Involucre 3 lines long. 



15. S. hydrophilus, Nutt. Very glabrous apparently from the first, pale or 

 even glaucous : stem stout, 2 to 4 feet high, many-leaved and bearing numerous 

 paniculate-corymbose small heads : leaves thickish, entire or occasionally denticulate 

 or repand, mostly lanceolate, with broad and strong midrib ; the lower 5 to 9 inches 

 long and tapering into a stout petiole ; the upper successively shorter and sessile : 

 scales of the narrow involucre oblong-linear, rather obtuse, mostly brownish-tipped : 

 rays 2 to 6 and linear, or sometimes wanting : disk-flowers 8 to 20, — Torr. & Gray, 

 Fl. ii. 440. 



Wet grounds, Lake Co. and Shasta Co. {Brewer) ; salt marsh at Vallejo (Greene) ; in the Sierra 

 at Mono Pass (Bolancler) ■ near Carson (Anderson) ; and thence to the Eocky JMountams. A 

 peculiar species. Involucre 3 lines long, in specimens from Vallejo 4 lines long and rayless. 



++ +^ ^+ Tall, 2 to 5 feet high, equably leafy to the top, glabrous throughout or nearly 

 so, not woolly ivhen young : involucre cylindraceous, subtended by a few loose and 

 nearly setaceous bracts: akenes glabrous. 



16. S. Andinus, Nutt. Stems extremely leafy, often branching: leaves lan- 

 ceolate or linear-lanceolate (or the lower oblong), tapering to both ends, either 

 sharply and closely denticulate or entire ; the caidine nearly sessile : heads small, 

 very numerous, corymbose-paniculate : rays 6 to 8. 



Near Carson City, Nevada (Anderson), and therefore probably within the limits of the State : 

 not rare northwaid and eastward to the Rocky ilountains, along streams. Heads variable in 

 size and in number of the flowers, from 4 to 6 lines high. 



17. S. triangularis, Hook. Stems mostly simple: leaves all but the u])per- 

 most petioled and delKud or triangular-lanceolate, or even hastate, acuminate, 

 thickly dentate (either coarsely or sometimes finely) with sharp salient teeth : heads 

 rather numerous, corymbose : rays 6 to 12. — Hook. Fl. ii. 332, t. 115. 



Low or wooded moist grounds of the Sierra Nevada ; Mariposa Grove, &c. (Brewer, Bolandcr) 

 Donner Lake ( Tormj), Sierra Valley (Lemmon) ; through Nevada to the Kocky Mountams, and 

 north to British Columbia. Heads varying from 4 to 7 lines high. 



102. ARNICA, Linn. 

 Head many-flowered, with pistillate rays, or sometimes homogamous by the 

 absence of the rays ; the flowers all fertile. Involucre usually broadly campanulate, 

 naked at base ; the scales thin-herbaceous, lanceolate or linear, equal, in one or two 

 series. Receptacle flat, naked. Eays elongated : disk-corollas with distinct and 

 usually elongated tube and funnelform or cylindraceous 5-lobed limb. Style-append- 

 ages obtuse, pubescent. Akenes linear, 5-angled or 5 - 10-ribbed, somewhat hirsute 

 or nearly glabrous. Pappus a single series of rather rigid strongly scabrous or 

 barbellate capillary bristles. — Perennial herbs; Avith mostly simple stems from 

 creejiing rootstocks, bearing solitary or few usually long-peduncled and rather large 

 heads of yellow flowers ; the leaves opposite (!) or in one or two Californian species 

 occasionally alternate, simple, entire or merely toothed. 



