GENUS 35. THISTLE FAMILY. 
15. Erigeron tenuis T. & G. Slender Rough 
Fleabane. Fig. 4375. 
Erigeron tenuis T.& G. Fl. N. A. 2: 175. 1841. 
_ Annual or biennial, branched from the base and some- 
times also above, strigose-pubescent; stems slender, erect 
or ascending, 1° high or less. Basal leaves obovate to 
spatulate, 1-24’ long, 3-6” wide, usually toothed; stem 
leaves linear or linear-oblong, toothed or entire; heads 
several or solitary, slender-peduncled, 7’-10” broad; in- 
volucre 2”-3” high, its linear bracts glabrous or spar- 
ingly pubescent; rays white or purplish, numerous; 
pappus of ray-flowers and disk-flowers alike, of few 
long bristles and short small scales. 
Moist prairies and plains, Missouri to Texas and Louis- 
jana. April-May. 
16, Erigeron vérnus (L.) T. & G. Early 
\WZ 
f N Wy L) 
Fleabane. Fig. 4376. 
Aster vernus L. Sp. Pl. 876. 1753. 
E. nudicaulis Michx. Fl. Bor. Am, 2: 124. 1803. 
Erigeron vernus T.& G. Fl. N. A. 2: 176. 1841. 
Q 
9 
\ EA 
rn 
Perennial by stolons and offsets; stem slender, 
simple or branched above, glabrous, or the 
branches pubescent, 1°-23° high. Leaves mainly 
in a basal rosette, glabrous, obovate, oval or spat- 
ulate, obtuse, repand-denticulate or entire, 2’-q’ 
long, narrowed into margined petioles; stem 
leaves mostly reduced to  subulate-lanceolate 
scales, the lowest sometimes spatulate or oblong; 
3 heads not numerous, corymbose, peduncled, about 
a 5” broad; involucre hemispheric, its bracts linear- 
: subulate; rays 20-30, white or pink, 2’’-3’’ long; 
pappus simple; achenes usually 4-nerved. 
sa In marshes and moist soil, Virginia to Florida and 
pe Louisiana. April-May. 
17. Erigeron acris L. Blue or Bitter Flea- 
bane. Fig. 4377. 
Erigeron acris L, Sp. Pl. 863. 1753. 
Erigeron Droebachianus O. F. Mueller, Fl. Dan. pl. 874. 
an acris Droebachianus Blytt, Norg. Fl. 1: 562. 
Brigeron acris debilis A. Gray, Syn. Fl. 1: Part 2, 220. 
1884. 
Biennial or perennial; stem hirsute-pubescent or 
glabrate, slender, simple, or branched above, 6’-2° 
high. Leaves pubescent or glabrous, entire, the 
basal and lower ones spatulate, mostly obtuse, 1’-3’ 
long, petioled, those of the stem mostly oblong or 
oblanceolate, obtuse or acutish, sessile, shorter; 
heads several or numerous, racemose or paniculate, 
peduncled, 5-6” broad; involucre hemispheric, its 
bracts linear, hirsute to glabrous; rays numerous, 
purple, equalling or slightly exceeding the brownish 
pappus; tubular pistillate flowers filiform, numer- 
ous; pappus simple or nearly so, copious. 
Labrador to Alaska, Maine, Ontario, south in the 
Rocky Mountains to Colorado and Utah. Also in Eu- 
rope and Asia. Races differ in size, pubescence and 
length of rays. July—Aug. 
