264 COMPOSITE FAMILY 



with broad base and winged petiole, the upper ones sessile, 

 toothed, 2 to 4 in. long. Heads several, with showy yellow 

 rays. Akenes pubescent. — Middle altitudes, as near Vernal 

 Falls. 



4. A. amplexicaulis Nutt. Plant 1 or 2 ft. high, nearly gla- 

 brous. Leaves oblong-lanceolate, acute, all but the lowest 

 sessile by a clasping base, sharply and deeply toothed, 2 to 4 

 in. long, 24 to V/2 in. broad. Heads few, with rays. Akenes 

 hairy. — Moist places from Tulare Co. north but not yet found 

 in the Yosemite National Park. 



5. A. chamissonis Less. Similar to no. 4 but more pu- 

 bescent; leaves often ovate and obtuse, only the uppermost 

 sessile, less deeply toothed, or entire. — Tenaya Trail, rare; 

 common from Tahoe north. True A. chamissonis is a narrow- 

 leaved plant of the far North. Our form, which may be a 

 distinct species, has been named A. mollis Hook. 



6. A. longifolia Eat. Leafy to the top, the many stems \ l / 2 

 to 3 ft. high, minutely pubescent. Leaves narrowly lanceo- 

 late, acute, tapering to base, entire or toothed, 3 to 6 in. long, 

 34 in. or less wide (rarely 1 in.). Heads 3 to 12, with showy 

 rays. Akenes only glandular. — Rare in the Sierra Nevada but 

 to be expected along streams. 



7. A. foliosa var. incana Gray. Plant l / 2 to \y 2 ft. high, 

 gray or white with loose wool. Leaves lanceolate, clasping 

 by a narrowed base, the lower sheathing the stem, acute, 

 mostly entire, 2 to 6 in. long. Rays present. Akenes hairy 

 or smooth. — Hog Ranch, Lake Tenaya, etc. 



8. A. nevadensis Gray. Stems 18 in. or less high, hairy and 

 glandular. Leaves oval to oblong, tapering at base, obscurely 

 toothed or entire, 2 or 3 in. long. Heads several, with showy 

 yellow rays.— Common from about 6000 to 10,000 ft. A. alpina 

 Olin, is a more northern species with narrower, lanceolate, 

 3-nerved leaves. 



39. SENECIO. Groundsel. 

 Herbs and shrubs with alternate leaves. Heads cylindric, 

 many-flowered, often with small bracts at base of involucre. 

 Akenes cylindric, with a copious pappus of soft white bristles. 



A. Stems leafy only toward the "base. 

 Leaves partly with narrow lobes except in dwarfed plants 



with solitary heads 1- S. aureus. 



Leaves all entire or merely toothed. 



Leaf-blades Wz in. or less long; low plants. 



Plant glabrous except when young 2. 5. petrocallis. 



Plant permanently woolly 3. 5. canus. 



