314 COMPOSITE. - Aplopappus. 



High Sierra Nevada, at Mono Pass, Pyramid Peak, Summit, &c., and through Nevada. Head 

 nearly two thirds of an inch long. 



13. A. Macronema, Gray, 1. c. Woody at base, sending up somewhat simple 

 white-woolly branches, a span high : leaves oblong-linear or oblanceolate, viscidly 

 glandular-puberulent, not rigid : heads terminal and solitary or somewhat clustered, 

 about 25-flowered : involucre broadly campanulate, shorter than the disk ; its inner 

 scales thin, lanceolate or linear ; the outer of equal length, more or less foliaceous 

 or passing into leaves : rays none : style-appendages filiform and much exserted : 

 akeries linear, 5-nerved, somewhat pubescent : pappus, &c., as in the preceding. 

 Macronema discoidea, Nutt. 1. c. 



On rocks in the Sierra Nevada ; Mono Pass, at 10,000 feet (Bolander) ; Mount Stanford, at 

 8,000 feet (Lemmon) ; thence east to Colorado or Wyoming. 



A. ARENARIUS, Benth., known only from Cape San Lucas, at the southern end of Lower Cali- 

 fornia, is quite out of our district. 



A. SPINULOSUS, DC., with pinnately cleft leaves, the commonest species east of the Rocky 

 Mountains, occurs in Coulter's Californian collection ; but a part of it was made between Califor- 

 nia and Mexico, and this species was in all probability picked up in Arizona. 



A. NANUS, Eaton, from Nevada, a broader-leaved form of Ericameria nana, Nutt. (which, as 

 the latter states, is near his E. resinosa), in its broader forms approaches A. suffruticosus, and 

 may occur in the northeastern part of the State. 



17. BIGELOVIA, DC. 



Heads corymbose or cymose-clustered, rarely paniculate, 5 - 30-flowered, homo- 

 gamous, the flowers being all perfect and with tubular corollas. Involucre imbri- 

 cated; the scales dry, chartaceous or coriaceous, chiefly destitute of foliaceous or 

 herbaceous tips. Eeceptacle flat, foveolate or alveolate-dentate, rarely with a chaft- 

 like projection in the centre. Appendages of the style-branches varying from ovate- 

 lanceolate to subulate or filiform. Akenes narrow, terete or angular, slightly if at 

 all compressed. Pappus simple, of copious unequal capillary bristles as in Aplo- 

 pappus, or softer and more equal, tawny at maturity. Herbs or undershrubs, with 

 narrow alternate leaves, and mostly small heads of yellow flowers (usually autum- 

 nal) ; all American and chiefly of the United States. Gray, Proc. Am. Acad. viii. 

 638. Linosyris, Torr. & Gray, &c. Chrysothamnus, (Nutt.) Benth. & Hook. Gen. 

 ii. 255, changed in appendix to Bigelovia. 



It appears that the genuine species of Linosyris, of the Old World, occasionally develop white 

 or purple rays, thereby showing that they belong to Galatella, a subgenus of Aster. These 

 American plants are, on the other hand, closely related to Aplopappus, from which some of them 

 (even of the Chrtjsothamnus section, which is on the whole so well-marked) are only arbitrarily 

 separated. Bigelovia and Chrysothamnus are strictly of the same genus, so that the former name 

 must be adopted. The species are more numerous in the interior region than in California. Ours 

 may be most readily made out by means of the following analytical key, which is mainly founded, 

 however, upon the proper characters of the natural sections here represented. 



Scales of the involucre not in conspicuous vertical ranks. 



Style-appendages ovate or triangular-subulate, shorter than the stigma- 

 bearing portion. 

 Leaves spatulate or oblanceolate, toothed or lobed : heads half an 



inch long, 12- 20-flowered. 1. B. MENZIESII. 



Leaves filiform or nearly so, entire.* 



Heads a quarter of an inch long, densely corymbed, 20-25-flowered : 



scales of involucre lanceolate, acute. 2. B. ARBORESCENS. 



Heads fewer : scales of involucre oblong. 3. B. COOPERI. 



Style-appendages very long and slender : branches mostly white-woolly. 



Heads 20 - 30-flowered, broad, leafy-bracted (see above). APLOPAPPUS MACRONEMA. 



* B. DIFFUSA, Gray (Ericameria di/iisa, Benth. Bot. Sulph., and Solidago di/usa, Gray, also Lino- 

 syris Sonoriensis, Gray) belongs here. As it has been found only at the southern extremity of Lower 

 California and on the opposite side of the Gulf, it is not likely to come within our limits. 



