3. Erigeron philadelphicus L. Philadelphia fleabane. Fig. 751. 



Short-lived erect perennial 2-7 dm. tall, with fibrous root system; rhizomes 

 absent; stems and leaves usually with spreading hairs; basal leaves narrowly to 

 broadly oblanceolate or even obovate, coarsely crenate-toothed or lobed, rounded 

 at the apex, tapering to the short subpetiolar base, mostly not more than 15 cm. 

 long and 3 cm. broad; stem leaves clasping basally, crenate to dentate or sub- 

 entire; head region not crowded; involucre 4-6 mm. high; disk corollas 2.5-3.2 

 mm. long; rays 5-10 mm. long, 0.2-0.5 (-0.6) mm. broad, never bluish; pappus 

 alike in ray and disk, simple, of capillary bristles (often shorter than the corolla 

 in the disk). 



In many habitats but is occasionally found in bogs and marshes, widespread 

 in Okla., Tex. and N.M., spring; most of U.S. and s. Can, 



4. Erigeron lonchophyllus Hook. 



Weak-rooted biennial or short-lived perennial, erect, 2-60 cm. tall, the herbage 

 spreading-hirsute or the leaves glabrate; basal leaves mostly oblanceolate, to 15 

 cm. long and 12 mm. wide, the cauline mostly linear, often elongate; peduncles 

 erect or suberect, the lower generally surpassed by their subtending leaves or 

 the head solitary; involucre 4-9 mm. high, hairy, not glandular; phyllaries 

 imbricate, acute or acuminate, commonly purple-tipped; pistillate flowers numer- 

 ous, with erect inconspicuous mostly white rays 2-3 mm. long and 0.25-0.5 mm. 

 wide; disk corollas 3.5-5 mm. long, shorter than the 20 to 30 pappus bristles. 

 E. minor Rydb. 



Meadows and wet ground, mostly in the mts. in N.M. (Taos Co.), July-Aug.; 

 s. Calif., s. Ut. and N.M. n. to B.C. and northw. and eastw. 



5. Erigeron flagellaris Gray. Running fleabane. 



Short-lived perennial with few roots, the taproot pronounced and usually 

 ligneous and often a few other roots present; some branches long-trailing; 

 essentially all the hairs of the stem appressed or ascending; pappus of ray and 

 disk essentially similar, double, of about 10 to 15 capillary bristles and some much 

 shorter microscopic bristles. 



Infrequent, low moist places in mts. of Trans-Pecos Tex., Okla. (Cimarron 

 Co.), N.M., (widespread) and Ariz, (widespread); S.D., Wyo. and Nev. s, to 

 Tex., N.M. and Ariz. 



6. Erigeron Coulteri Porter. 



Fibrous-rooted perennial from a slender rhizome or branching caudex; stems 

 1-6 dm. tall, usually amply leafy, spreading-hirsute at least above; leaves hairy, at 

 least the lower generally toothed, the middle cauline ones mostly broadly lanceo- 

 late to oblong or ovate, to about 9 cm. long and 3 cm. wide; heads 1 to 4, mostly 

 naked-pedunculate, the involucre 7-10 mm. high, its thin green phyllaries equal, 

 villous-hirsute, the hairs with black crosswalls toward the base; rays 5 to 100, 

 white, 9-24 mm. long, 1.2-1.7 mm. wide; disk corollas 3-4.4 mm. long; inner 

 pappus of 20 to 25 bristles, the outer obscure or wanting; achenes 2-nerved. 



Meadows and streambanks, in the mts. in N.M. (Rio Arriba, San Miguel and 

 Santa Fe cos.), July-Aug.; n. Ida. and n.e. Ore. to Calif, and N.M. 



7. Erigeron peregrinus (Pursh) Greene. 



Fibrous-rooted perennial from a short rhizome or short stout caudex, to 7 dm. 

 tall, amply leafy or in small forms subscapose; heads solitary or few, the disk 

 10-25 mm. wide; involucre 7-11 mm. high; phyllaries linear, attenuate, loose, 

 mostly rather herbaceous and about equal, about 1 mm. wide; rays 30 to 80, 

 8-25 mm. long, 2-4 mm. wide; disk corollas mostly 4-6 mm. long; pappus of 20 



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