Aster. COMPOSTTJ?. 325 



Sioim Novadn, hotwoon f'link's and tlio Yosrtnitn, nt about 8,000 feet, Uolavrlrr. Nonr DoiiTicr 

 I^ako (.Torrr)/, (hrr.m), mid Siena Valley, Lrmmnn. Komid near Carson by Dr. Anderson; 

 thence east to the llocky ^lountaina. 



+-+--{- Stems simple, naked at the summit, and hearing a single liead, or rarely 

 two or three : scales of the hemispherical involucre veri/ little imbricated, narrow, 

 nearly equal, and destitute of foliaceous or green tips. \A transition from Aster to 

 Erigeron.) 



++ Leaves broad or narrowish : style-appendages short and broad. 



1 3. A. salsuginosus, liicliardson. Minutoly pubescent or glabrate : stem 6 to 

 18 inches high, leat'y to near the suniiuit : leaves entire; tlie lowest spatulate, obo- 

 vate, or oblanceolate, tapering into a margined petiole ; the upper becoming lance- 

 olate and ovate-lanceolate, acute, with broad base usually halt-clasping ; uppermost 

 reduced to one or two subulate bracts : head solitary or two or three on naked 

 peduncles : scales of the involucre slender, glandular, nearly equal, 4 lines long, 

 loose : rays 30 to 40, violet or purple : akenes of the ray 5 - 6-nerved, of the disk 

 3 - 4-nerved. — Hook. Bot. Mag. t. 2942. 



Var. angUStifolius, Gray, liadical and lowest caulino leaves lincar-spatulato, 2 

 to 5 lines wide ; the upper linear : stems a foot high, naked above, bearing two or 

 three slendcr-peduneled heads. 



Subnlpino and alpine meadows, in the Sierra Nevada, at 6,000 to 10,000 feet ; thence to alpine 

 regions of the Colorado Rocky Mountains, and north to Alaska and the subarctic regions. A 

 handsome species ; the heads an inch and a half in diameter, including the expanded rays. The 

 variety. Sierra County, Lemmon. 



++ ++ Leaven very narrow ; style-appendages long and slrndcr-sidnilafe. 



14. A. Andersonii, Gray. Lightly woolly when young, becoming glabrous : 

 stem simple and scapo-liko, a span to a foot high, tcrminal(>(l by a single rather 

 large head : radical leaves tufted, linear, almost grassy (2 to 8 inches long, from a 

 line to 4 lines Avide), coriaceous, 3-7-ncrved; tlie cauline smaller, the uppermost 

 subulate : scales of the involucre lanceolate or linear, loose, more or less tomentose, 

 almost equal in length (4 or 5 lines long), the outer ones greenish : niys 16 to 20, 

 purple : akenes oblong, 4-G-nerved : bristles of the pappus barbel late-serrato. — Proc. 

 Am. Acad. vii. 352. Erigeron Andersonii, Gray, 1. c. vi. 540. 



Wet alpine meadows, kc. Sierra Nevada, from l^Iariposa to Sierm Co., at 7,fiOO to 10,000 

 feet. Discovered by Dr. Anderson, near Carson, Nevada. Expanded head with the raj's an 

 inch or more in diameter. 



A. PULCHELLUS, Eaton in Bot. King Exp. is perhaps too near this, ond A. ai-pigenus, Gray, 

 1. c. viii. 389, la also closely related ; they form a peculiar group in the Xylorhim section of 

 Ortlwmcris. 



§ 4. Annuals or biennials, with chiefly entire narroui leaves: scales of the involucre 

 imbricated, narrow, destitute of distinct green tips : akenes narrow and 3-5- 

 nerved: pappus fine and soft, — OxYTniroijuM, Torr. K- Gray. 



15. A. dlvarloatua, NuU. Glabrous, difTusely much briinrlied, a foot or two 

 liigh : the braiiclioa siomior : lower cauline leaves lanceolnte ; Mio u|)per linear and 

 at length subulate, very acute : heads small (3 or 4 lines long), loosely jianicled : 

 scales of the involucre 25 to 30, lanceolate-subulate, with greenish back and scari- 

 ous margins : rays linear, exserted, numerous in a single row : akenes very minutely 

 pubescent, 5 -6-nerved. — Torr. & Gray, Fl. ii. 163. 



Salt marshes, San Francisco, he, Bnlavdrr. This is the Pacific form, viz., Trijyolium con- 

 spicunm of bindley, and yi. Orciianns of Nuttall, which inhiibits the western const of tlic ronti- 

 nent down to Chili, and apparently is only local so far north as Cnlifornia. It dilfei's from the 

 A. divaricaJus of the Atlantic coast in tlie rather lirnicr nud greener scales of the iiivolnci-e, heads 

 inclined to be larger, and the branches less slender. The junture akenes in lx)th arc little com- 

 pressed and more or less distinctly .'i-nerved. 



