COMPOSITAE. 267 



the cauline linear; stems 5-15 cm. high, each bearing a single head, this 10-12 

 cm. high; involucre villous, the bracts equal; rays none; pappus simple; 

 akcnes glabrous. Stony ridges, Blue Mountains. 



Erigeron inornatus Gray. (E. eradiatus (Gray) Piper.) Perennial from 

 a woody base, glabrous or sparsely hirsute, green, leafy; stems few, erect, 

 rather rigid, 30-40 cm. high; leaves linear, 2-5 cm. long, only 2-4 mm. wide; 

 heads cymose, whitish, rayless; involucres campanulate, the bracts glabrous 

 and unequal; pappus simple; akenes pubescent. In dry pine woods, Blue 

 Mountains. 



Erigeron canadensis L. Annual, strictly erect, simple or with erect 

 branches, usually 30-100 cm. high, loosely hirsute throughout; leaves numer- 

 ous, linear, entire or the lower spatulate and incisely lobed or dentate; heads 

 panicled, very numerous, small, 3-5 mm. high; involucres cylindric; rays 

 whitish, very small. Native but weedy in habit and abundant in cultivated 

 land. 



Erigeron acris L. Biennial, erect, glabrous or sparsely pubescent, 30-60 

 cm. high; basal leaves spatulate-lanceolate; cauline lanceolate, sessile, all 

 entire, acute or obtuse, 5-10 cm. long; heads paniculate or corymbose, 6-8 

 mm. broad; involucre puberulent and somewhat hirsute; rays very narrow, 

 pinkish, equalling the disk, within them a series of tubular filiform pistillate 

 flowers; akenes smooth; pappus copious, brownish. Open woods, in the 

 mountains. 



Erigeron divergens T. & G. Annual, usually tufted and branched, soft- 

 hirsute throughout, leafy to the top; lower leaves spatulate, obtuse, 2-8 cm. 

 long; upper cauline lanceolate, sessile, smaller, all entire or sometimes toothed 

 or lobed; heads numerous, short-peduncled; involucre 4-5 mm. high, hirsute; 

 rays white or violet, very numerous, 5-6 mm. long; pappus double, the inner 

 of a few deciduous bristles, the outer persistent, very short, about as long as 

 the breadth of the akenes; receptacle becoming convex. Sandy soil, in- 

 frequent. 



Erigeron ramosus septentrionalis Fernald & Wiegand. Annual or biennial, 

 erect, branched above, sparsely hirsute, leafy to the top; lower leaves spatulate- 

 lanceolate, acute, entire or dentate, the blades 5-8 cm. long; upper cauline 

 lanceolate, entire, sessile, smaller; heads loosely corymbed; involucre 34 mm. 

 high, glabrous or with a few bristly hairs; rays white, numerous, short, 4-6 

 mm. long; pappus of the disk-flowers double, the inner of few deciduous bristles, 

 the outer of short persistent scales; ray-flowers with few or no bristles to the 

 pappus. Meadows, uncommon. 



Erigeron membranaceus Greene. Perennial; stems erect, 30-60 cm. high 

 or dwarfed in high alpine forms; leaves thin and glabrous except the ciliate 

 margin, the lower oblong-spatulate, 10-15 cm. long, the upper lanceolate 

 to ovate-lanceolate; heads solitary or several, all on long peduncles, each 2-2.5 

 cm. broad; involucral bracts lanceolate, acuminate, viscid, often purple- 

 tinged; rays about 30, violet, 10 mm. long; akenes sparsely pubescent. Abun- 

 dant in the Blue Mountains at and above the limits of trees. Some high alpine 

 forms have all the leaves narrow. 



Erigeron speciosus DC. Perennial, tufted, sparingly hirsute or nearly 

 glabrous; stems 30-50 cm. high, leafy to the top, erect; leaves lanceolate, 

 entire, acute or acuminate, usually ciliate at least at the base; the upper cauline 

 sessile by a broad base; the lower and radical petioled, 515 cm. long; heads 

 few, in a loose corymb; involucre hirsute or nearly glabrous, 56 mm. high; 

 rays about 100, narrow, violet, about 1 cm. long; akenes pubescent; pappus 

 double, the outer bristles very short. Gravelly soil, infrequent. 



