COMPOSITAE (COMPOSITE FAMILY) 817 



oblanceolate, wholly foliaceous ; rays pinkish, longer than the style. Saline 

 soil, P. E. I.; Wyo. to N. Mex., and westw. July-Get. FIG. 976. 



23. ERiGERON L. FT,EABANE 



Heads many-flowered, radiate, mostly flat or hemispherical ; the narrow rays 

 very numerous, pistillate. Involucral bracts narrow, equal, and little imbri- 

 cated, never coriaceous, neither foliaceous nor green-tipped. Receptacle flat or 

 convex, naked. Achenes flattened, usually pubescent and 2-nerved ; pappus 

 a single row of capillary bristles, with minuter ones intermixed, or with a dis- 

 tinct short outer pappus of little bristles or chaffy scales. Herbs, with entire 

 or toothed and generally sessile leaves, and solitary or corymbed naked-pedun- 

 culate heads. Disk yellow ; rays white, pink, or purple. (The ancient name 

 presumably of a Senecio, from %p, spring, and ytpwv, an old man, suggested 

 by the hoariness of some vernal species.) 



1. EUERtGERON DC. Rays elongated (short in a form of no. 7), crowded 



in one or more rows. 



* Leafy-stemmed perennials. 

 M- Pappus double. 



1. E. glabSllus Nutt. Stem 1.5-4 dm. high, stout, hairy above, the leafless 

 summit bearing 1-7 large heads ; leaves nearly glabrous, except the margins, 

 entire, the upper oblong-lanceolate and pointed, closely sessile or partly clasp- 

 ing, the lower spatulate and petioled ; rays more than 100, purple, more than 

 twice the length of the hoary-hispid involucre ; outer pappus of minute bristles. 

 (E. asper Nutt.) Plains of n. Wise., Man., and westw. June-Sept. 



*- H- Pappus simple. 

 M- Stems slender, densely tufted, very leafy ; leaves narrowly linear, entire. 



2. E. hyssopifblius Michx. Slightly pubescent, 1-3 dm. high, from filiform 

 rootstocks ; branches prolonged into slender naked peduncles, bearing solitary 

 small heads; rays 20-30, rose-purple to whitish. Wet calcareous rocks, Nfd. 

 and Lab. to Mackenzie, s. to N. B., Me., Vt., and Mich. June, July. 



w -> Stems stouter, not tufted; leaves broader, toothed. 



3. E. pulch611us Michx. (ROBIN'S PLANTAIN.) Hairy, producing offsets 

 from the base; stem simple, rather naked above, bearing few (1-9) large heads 

 on slender peduncles ; basal leaves obovate and spatulate, sparingly toothed, the 

 cauline distant, lanceolate-oblong, partly clasping, entire ; rays (about 50) rather 

 broad, light bluish-purple. (E. bellidifolius Muhl.) Copses and moist banks, 

 s. Me. to Ont., Minn., and sou^hw. Apr.-June. 



4. E. philade'lphicus L. Hairy; stem leafy, corymbed, bearing several small 

 heads ; leaves thin, with a broad midrib, oblong ; the upper smoothish, clasping 

 by a heart-shaped base, mostly entire ; the lowest spatulate, toothed ; rays 

 innumerable and very narrow, rose-purple or flesh-color. Throughout, locally 

 common, generally in alluvial soil. May-Aug. 



* * Perennial by rosulate offsets, with scape-like stems; pappus simple. 



5. E. vdrnus (L.) T. & G. Glabrous ; leaves clustered at the base, oval or 

 spatulate; scape leafless, slender, 3-7 dm. high, bearing 5-12 small corymbed 

 heads; rays white. (E. nudicaulis Michx.) Low grounds, e. Va., and 

 southw. May. 



* * * Annuals (or sometimes biennials), leafy-stemmed and branching ; pappus 

 double, the outer a crown of minute scales, the inner of deciduous fragile 

 bristles, usually wanting in the ray. 



6. E. Annuus (L.) Pers. (DAISY F., SWEET SCABIOUS.) Stem stout, 2-15 

 dm. high, branched, beset with spreading hairs; leaves coarsely and sharply 

 toothed; the lowest ovate, tapering into a margined petiole; the upper ovate- 



GRAY'B MANUAL 52 



