1496 CONTRIBUTIONS FKOM THE NATIONAL HERBARIUM 



2. Chrysothamnus paniculatus (A. Gray) H. M. Hall, Univ. Calif. Publ* 



Bot. 3: 58. 1907. 

 Linosyris visoidifiora paniculata A. Gray in Torr. U. S. & Mex. Bound. Bot. 



80. 1859, nomen nudum. 

 Bigelovia paniculata A. Gray, Proc. Amer. Acad. 8: 644. 1873. 

 Ericameria paniculata Rydb. Fl. Rocky Mount. 853. 1917. 

 Sonora. Utah and California to Arizona; type from "California." 

 Shrubb}', 2 meters high or less, essentially glabrous, densely glandular-punctate; 

 leaves 2 cm. long or less; phyllaries few, in 3 or 4 ranks, without green tips, not 

 keeled; achenes densely pubescent; pappus brownish, about 6 mm. long, 



3. Chrysothamnus latisquameus (A. Gray) Greene, Pittonia 4: 42. 1899. 

 Bigelovia gravcolens latisquamea A. Gray, Proc. Amer. Acad. 8: 645. 1873. 

 Sonora. New Mexico and Arizona; type from New Mexico. 



Shrub, densely and compactly whitish-tomentose; leaves linear-filiform or 

 linear, 2 to 5 cm. long, less than 1 mm. wide; involucre 7 to 9 mm. high, the 

 phyllaries obtuse, the outer tomentulose, the inner glabrous; achenes densely 

 pubescent; pappus whitish, about 7 mm. long. 



26. QREENELLA A. Gray, Proc. Amer. Acad. 16: 81. 1880. 

 1. Qreenella ramulosa Greene, Pittonia 1: 302. 1889. 



Central western Baja California; type from San Bartolom6 Bay. 

 Suffrutescent perennial, about 30 cm. high, densely and intricately branched, 

 finely glandular-viscid; leaves linear-elliptic or narrowly oblanceolate, 2.5 cm. 

 long or less, 3.5 mm. wide or less, acute, 1-nerved, impressed-punctate, spinulose- 

 ciliolate, deciduous, the upper ones reduced to minute bracts; heads pedicellate, 

 solitary at tips of branchlets, about 4 mm. high; involucre 2 or 3-seriate, graduate, 

 the oblong obtuse glandular-granular thin-margined phyllaries greenish above, 

 arranged in distinct vertical ranks; rays about 3, fertile, white, "changing to 

 rose-purple," the lamina 3 mm. long; disk flowers about 6, white, "changing to 

 rose-purple;" achenes oblong-turbinate, 10-striate, densely pubescent; pappus 

 of the ray achenes of about 15 lanceolate squamcllae 0.5 mm. long, that of the 

 disk achenes of about 30 linear-lanceolate acuminate paleaceous awns about 

 1.3 mm. long. 



27. ASTER L. Sp. PI. 872. 1753. 

 Herbaceous, rarely suffrutescent or shrubby; leaves alternate, usually entire 

 or slightly toothed; heads small to large, solitary to panicled, radiate or rarely 

 discoid, the rays white to violet, never yellow, the disk whitish or 3'ellow, often 

 changing to purplish; involucre usually distinctly graduate, the phyllaries usu- 

 alh' narrow and herbaceous-tipped; style branches acute or acuminate; pappus 

 of numerous slender subequal bristles. 

 Plants glabrous throughout, glaucous or glaucescent. 



Plant unarmed; heads discoid 5. A. carnosus. 



Plant spine-bearing; heads radiate 6. A. spinosus. 



Plants pubescent or glandular, at least on the involucres, not glaucous or glau- 

 cescent. 

 Leaves subulate to spatulate, entire, 1 cm. long or less; plants 15 cm. high or 



less, many-stemmed 8. A. leucelene. 



Leaves linear to lanceolate or rhombic, much more than 1 cm. long, or else 

 plants much more than 15 cm. high. 

 Leaves rhombic or cuneate, spiny-toothed, strongly reticulate. 



7. A. frutescens. 

 Leaves linear to lanceolate, not spiny-toothed or reticulate. 



Plant finely granular-glandular, not pubescent; branches sharply angled. 



4. A. palmeri. 



