Aster. COMPOSITE. 325 



Sierra Nevada, between Clark's an& the Yosemite, at about 8,000 feet, Bolande.r. Near Conner 

 Lake (Torrey, Greene), and Sierra Valley, Lemmon. Found near Carson by Dr. Anderson; 

 thence east to the Rocky Mountains. 



+- -*--H Stems simple, naked at the summit, and bearing a single head, or rarely 

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

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

 firigeron.) 



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



1 3. A. salsuginosus, Richardson. Minutely pubescent or glabrate : stem 6 to 

 18 inches high, leafy to near the summit : leaves entire; the lowest spatulate, obo- 

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

 olate and ovate-lanceolate, acute, with broad base usually half-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. ailgustifolius, Gray. Radical and lowest cauline leaves linear-spatulate, 2 

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

 three slender-peduncled heads. 



Subalpine 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. 



++ ++ Leaves very narrow : style-appendages long and slender-subulate. 



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

 stem simple and scape-like, a span to a foot high, terminated by a single rather 

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

 line to 4 lines wide), coriaceous, 3 - 7-nerved ; the cauline smaller, the uppermost 

 subulate : S3ales of the involucre lanceolate or linear, loose, more or less tomentose, 

 almost equal in length (4 or 5 lines long), the outer ones greenish : rays 1 6 to 20, 

 purple : akenes oblong, 4 - 6-nerved : bristles of the pappus barbellate-serrate. Proc. 

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



Wet alpine meadows, &c., Sierra Nevada, from Mariposa to Sierra Co., at 7,500 to 10,000 

 feet. Discovered by Dr. Anderson, near Carson, Nevada. Expanded head with the rays an 

 inch or more in diameter. 



A. PTLCHELLUS, Eaton in Bot. King Exp. is perhaps too near this, and A. ALPIGENUS, Gray, 

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

 Orthomcris. 



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

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

 nerved: pappus fine and soft. OXYTRIPOLIUM, Torr. & Gray. 



15. A. divaricatus, Xutt. Glabrous, diffusely much branched, a foot or two 

 high : the branches slender : lower cauline leaves lanceolate ; the upper linear and 

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

 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, &c., Sof under. This is the Pacific form, viz., Tripolium con- 

 spiciium of Lindley, and A. Orcyamis of Nuttall, which inhabits the western coast of the conti- 

 nent down to Chili, and apparently is only local so far north as California. It differs from the 

 A. divaricatus of the Atlantic coast in the rather firmer and greener scales of the involucre, heads 

 inclined to be larger, and the branches less slender. The mature akenes in both are little com- 

 pressed and more or less distinctly 5-nerved. 



