364 COMPOSITAE 
. long, 1-2 mm. wide; disk-corollas 2.54.4 mm. long; style-appendages 0.1-0. 15 m m. long; 
pappus Pg 20-30 slender white bri atles, porate ee a few very slender and i ieditspicnous short, 
r setae; achenes 2-nerved, hairy or subglabro 
pits y, vig sandy ary in the valleys i foothills, pate with sagebrush, Arid pare ye Zone; south- 
ern British Columbia and extreme northwestern Montana through eastern Washington and Oregon to Sierra 
County, California, and adjacent Nevada eastward through the Snake River plains to Rexburg, Idaho, and thence 
southward to Logan, Utah. Type locality: “‘In the Rocky Mountain range, in Oregon. ”” May-July. 
Erigeron filifolius var. robtistior M. Peck, Proc. Biol. Soc. “aby pe ot, Rie 4: a stout; 
head ire solitary, the disk 12-18 mm. wide; involucre 5-7 mm. high s 50-1 6-1 long; disk: 
corollas 3.7—5.5 mm. long; style- Sieiadnices. 0.15-0.3 mm. long. Kittitas ‘Couets, Waskicctom "southward to 
Wasco and Gilliam Counties, Oregon. Type locality: Columbia River near Rowena, Wasco County, Ore 
42. ee hate lassenianus Greene. Lassen Daisy. Fig. 5623. 
Greene, Fl. Fran. 389. 1897. 
piesatte lassenianus var. deci ciens Cronquist, Brittonia 6: 171. 1947. A discoid form. 
lender perennial with an evide ident slender taproot and a simple or subsimple crown or sh 
‘ ge fin r 
m. g. Basa te, taper- 
ing gradually to the slender petiole, up to cm, long and 5 mm. bog cauline leaves several, 
uced, linear, cocaine mele peeved heads usually several (up to 20), occasionally soli- 
pate the disk 5-11 m wide; e 5-6 m m. high, glandular and spreading abe te; wre llaries 
scarcely to eitdenity sdibrieate: a or greenish, sien oe -margined, acuminate; rays 10-25 
blue or pink to sometimes white, mm. —2.0 mm. wide, or sbedsionalty¥ wanting; disk- 
machen 3-4 mm. long; pappus of 15-25 ireoile bristles ead a few short outer setae; achenes 2- 
nerved. 
Dry places at moderate elevations, Arid Transition Zone; Butte and Plumas Counties to Eldorado County, 
California. Type locality: Mount Dyer, Plumas County. June-Aug. 
43. Erigeron corymbésus Nutt. Foothill Daisy. Fig. 5624. 
Erigeron corymbosus Nutt. Trans. Amer. Phil. Soc. II. 7: 308. 1840. 
1 with a taproot and not much-branched caudex, 1-5 dm. tall, ec: or teed 
u y : 
gradually or strongly reduced; heads 1-16, the disk 7-13 mm. wide; involucre ie 
canescently villous-hirsute with short subappressed hairs; phsliniaes saraeetak 3 mbric only 
— or rays 35 thickened on the back, green or tan, with darker midrib and purplish, ‘vals 
i i m. 1 
tips; r. —65, deep e or occasionally pink, 7-13 m ong, 1.2-2 mm. w 
Serolies (3.0 )4.0- mm. long; style-appendages ate, joceey. .2-0.25 mm. long; pappus of 
20-. m bite and some evident, short, outer setae rrow scales; achenes 2-nerved. 
Ope lly dry places, often among sagebrush, Arid i ansition Zone; scathien British Columbia to cen- 
tral Fete pe gece lg A sete east of the Cascade Mountains eastward to western Montana and western Wyoming. 
Type locality: ‘‘Rocky Mountains, towards the Oregon,”” June—July. 
44. soci as caespitésus Nutt. Gray Daisy. Fig. 5625. 
ook. Fl. ~— ape 2: 23.: 4834. 
ee epappus pronifor Hook. loc 
Eriger espitosus Nutt. Trans. ‘Amer. Phil. Soc.t1. 7+ 307. 
‘on cane. sceas Tor r. & Gray, Fl. N. Amer. 2: 179. 1841. te Hd & Arn 
Erigeron caespitosus var. aaldiieias Torr. & Gray, loc. cit. — pretditirice he 1834. 
Erigeron subcanescens Rydb. Bull, Torrey Club 24: 294. 
Perennial with a stout taproot and stout, esa branched caudex, sometimes also creeping 
below ground; stems curved at the base, 5-30 cm. high; herbage densely pubescent with short 
spreading hairs. Basal leaves triple-nerved ( Ghscitihy so in depauperate apetinens): oblanceolate 
or spatulate, usually rounded or obtuse at the tip, up to 12 cm. long a mm. wide; cauline 
ova ong to li 
: ic hack 
baceous ; rays 30-100, blue, pink < or white, 5-15 al: "Be g, 1-2. Sih mm. aide iek-covollds 3.2-4.4 
mm. long; style- appendages 0.1 aw ee mm. long; neat of 15-25 firm bristles and some evi- 
dent, a setose scales ; achenes ape 
Dry, open, often rocky pre from sa “oti fe ae elevations in the mountains, Arid Transition and 
lower Tiwaat Zones; — —— and Yukon through British Columbia and extreme eastern Wash- 
ington to. Idaho. , Uta ah, Arizo ew Mex mei posinkoet to Saskatchewan, North Dakota, a nd Ne braska. Type 
locality: ‘ ‘summits of dry hills in a Rocky Mountain range, on the Colorado of the West.” Ju 
4. er nevadincola Blake. Nevada Daisy. Fig. 5626. 
A. Gray, Proc. Amer. Acad. 8: — sgt = Wedd. 1857. 
maa nevadincola Blake, ear: Biol. Soc. Wash. 35: 
Coarse perennial with a strong taproot and en: or slightly branched caudex ; eats usually 
Sorsicheet at a 10-30 cm. high; herbage strigose or short-hirsute with app pressed or ascending 
hairs. 1 triplesnerved, ae “ sometimes : Fie tapering gradually to 
the rile up to o e; cauline leaves few and a ruptly reduced ; a d soli- 
