ta 
Neues aus: New Manual of Botany of the Central Rocky Mountains. 485 
13. Symphoricarpos occidentalis Hook. var. quercifolia A. Nelson, 1, c., 
p. 470. — Stems short, simple, erect: leaves large, coarsely and deeply 
undulate-toothed. — Infrequent; on the plains in northern Wyoming. 
14, Macronema lineare var. canescens A. Nelson, l. c., p. 502. - 
Leaves 2—3 cm long, acute, lightly canescent and nearly or quite 
destitute of resinous atoms: involucral bracts very finely lanate. — 
Yellowstone Park and adjacent Wyoming. 
15. Aster culminis A. Nelson, l. c., p. 513. — Caudex low, woody; 
stems solitary from the enlarged crown, rather stout, short-lanate, pu- 
bescent, 1 dm or less high, bearing a large solitary head: leaves linear, 
Spatulate, 1—3 cm long, mostly basal, cinerous-hirsute to silky: in- 
volucral bracts loosely erect, broadly linear, silky, short-lanate. all nearly 
equaling the disk: rays white, shading to violet: achenes with short pu- 
bescence; pappus simple. (A. alpinus L. as to our range.) — Berthoud 
Pass, Colorado, 
16. Erigeron Garrettii A. Nelson, ]. c., p. 526. — Perennial from a 
short woody somewhat branched and tufted crown: leaves all basal, 
nearly or quite glabrous, 2—4 cm long, oblanceolate, obtuse or sub- 
acute, tapering to a short petiole: scape 7—12 cm long; the solitary 
heads large, 2—3 cm broad; involucre dark green, 7—8 mm high, 
obscurely hirsutulous as is also the scape; the bracts linear-subulate: 
rays 40—50, white, linear-spatulate, the ligule 8—10 mm long: outer 
pappus minute or wanting. — Reported only from Cottonwood Cañon, 
Utah. 
17. Erigeron trifidus var. discoideus A. Nelson, l. c., p. 529. — Ray- 
less form of the species, and sometimes glabrate. — Colorado and Utah 
to Montana and Idaho. 
18. Erigeron colo-mexicanus A. Nelson, l. c., p. 529. — Stems few 
to several from a slender annual taproot, ascending, naked-pedunculiform 
above the middle, very leafy, flowering when very short, the later heads 
on stems 7—15 cm long: leaves mostly linear-spatulate to linear, the 
basal sometimes oblanceolate and 3-lobed at apex, all softly cinereous- 
pubescent: heads much as in E. divergens. (E. cinereus Gray, Pl. Fendl., 
LXVIII, 1848: not E. cinereus H. & A. Comp. Bot. Mag., II: 50, 1836.) — 
Southern Colorado and New Mexico. . . 
19. Erigeron lapiluteus A. Nelson, 1. c., p. 530. — Biennial, with a 
strong vertical taproot; generally only one stem from the enlarged crown, 
simple, stout, striate, erect, paniculately branched as to the inflorescence, 
3—6 dm high, purplish, glabrate, the whitish hairs very straggling, 
obscurely granular: leaves numerous, glabrate; crown leaves oblanceolate, 
petioles 3—6 cm long; lower stem leaves similar but with short-winged 
petioles; upper leaves sessile, narrowly lanceolate, not much reduced; 
bracts small, linear: heads numerous, on rather slender peduncles; in- 
volucral bracts dark green, in 2 rows, subequal, very narrow, acuminate, 
shorter than the 1 cm high disk: flowers very numerous, rays filiform, 
purplish, largely concealed by copious pappus: achenes linear, less than 
