OEDER LXIV. COMPOSITE COMPOSITE-FAMILY. 



167 



heads large, with numerous, deep-purple rays, somewhat pnniculately corym- 

 bose ; involucre-scales linear-lanceolate, longer than the disk, mostly in a single 

 row, viscid-pubescent, as well as the branchlets. A. very ornamental species '- 

 moist grounds, not very common in N. Eng., but abundant westward. Sep. 



9. A. miser. 



Starved Aster. 



Stem more or less pubescent, generally very branching ; leaves lanceolate, 

 or oblong-lanceolate, tapering at base, acuminate, acutely serrate in the middle; 

 heads small, racemose on the branches, often scattered; rays very short, bluish 

 or white; involucre-scales linear, acute, or somewhat obtuse, in 8 4 rows. A 

 very common and extremely variable species, in thickets and fields, varying in 

 size according to the soil, 8' 30'. Sep. Oct. 



10. A. Tradescanti. Narrow-leaved Aster. 



Nearly or quite smooth ; stem terete, with virgate, erect, spreading or di- 

 verging branches; leaves linear-lanceolate, the lower ones commonly serrate 

 in the middle, the others entire; heads very numerous, rather small, mostly 

 with rays, densely racemose on the branches ; involucre-scales narrow-linear, 

 more or less acute, in 8 4 rows. A very common species in moist fields, dis- 

 tinguished from the last by its much narrower leaves and involucre-scales, and 

 its numerous, densely racemose heads. Very variable. Aug. Oct. 



11. A. simplex. 



Willoiv-leaved Aster. 



Nearly or quite smooth ; stem tall, very branching ; leaves lanceolate, acu- 

 minate, lower ones serrate, upper entire ; heads medium size, rather few, ra- 

 cemose on the branches, forming a terminal, leafy panicle; involucre-scales 

 linear, subulate, loosely imbricated. Another very variable species, with pale 

 blue or whitish flowers. In low grounds. Common. Sep. 



12. A. dumosus. 



Busliy Aster. 



Nearly or quite smooth ; stem branching, paniculate; leaves linear, those of 

 the branches much smaller, oblong, rough on the margin, crowded, entire; 

 lower ones sometimes serrate ; heads medium size, with pale purple, or whitish 

 rays, racemose on the branches, mostly solitary on the branchlets ; involucre- 

 scales closely imbricate, broader at summit, obtuse, in 4 6 rows. A variable 

 and rather handsome species, common in thickets and fields. Sep. 



13. A. multiflorus. Many-flowered Aster. 



Pubescent and somewhat rough ; stem very branching ; leaves linear, 

 crowded on the stem, entire, sessile, those of the branches much smaller; heads 

 small, with white rays, very numerous, densely racemose on the spreading 

 branches; involucre-scales linear -spatulate, with spreading, green tips. An 

 ornamental species with very dense panicles of innumerable white flowers. 

 Dry soils. Common. Stem 1 2 ft high, bushy. Sep. 



14. A. longifolius. 



Long-leaved Aster. 



Nearly or quite smooth : stem very branching, corymbosely paniculate 

 above ; leaves linear-lanceolate, or linear, lower ones sometimes ovate-lanceo- 

 late, entire, or remotely serrate in the middle, smooth and shining above; 

 heads large, numerous, with many light-purple rays, racemose on the branches ; 

 involucre-scales in 3 5 rows, linear, with acute, spreading, or recurved, green 

 tips. A very handsome species, 2 5 ft high, in moist grounds ; often with a 

 purpl^e, flexuous stem. Extremely variable in foliage and size. Common. 

 Sep. Oct. 



15. A. flexuosus. Marsh Aster. 



Stem slender, branching, flexuous, very smooth ; leaves linear, long and 

 fleshy, acuminate, entire, upper ones subulate ; heads large, with purple rays 

 and yellow disk, solitary on the leafy branchlets ; involucre-scales in many 

 rows, ovate-lanceolate, appressed, acuminate. A common species in salt 

 marshes; about 1 ft high. Aug. Oct. 



16. A. linifolius. 



Sea Aster. 



Stem very branching, paniculate, with nearly erect branches; leaves linear- 

 lanceolate, acuminate, entire, fleshy, those on the branches subulate ; heads 

 small, racemose, or paniculate on the branches, numerous ; rays short, not pro- 

 jecting beyond the disk, purplish, somewhat in 2 rows; involucre cylindric, 

 with subulate scales, in few rowa An annual species, 1 2 ft. high, found in 

 ^alt marshes. Aug. Sep. 



1. SERICOCARPUS. 



Heads 12 16-flowered. Ray-flowers 4 6, perfect. Disk- 

 flowers 6 10. Involucre oblong, with imbricated, appressed, 

 green-tipped scales. Receptacle alveolate. Achenia obconic, 

 very silky. Pappus simple, with capillary bristles. Per. 



1. S. conyzoides. 



White-topped Aster. 



Somewhat pubescent, simple, corymbose above ; leaves oblong-lanceolate, 

 lower often spatulate, smooth beneath, veiny, narrowed at base, serrate toward 

 the apex, the upper ones sessile, nearly entire, lower petiolate ; heads small with 

 short, white rays, and pale yellow disk, in loose flat corymbs ; involucre-scales 

 appressed, whitish, with recurved tips ; pappus rust color. A common plant, 1 

 2 ft. high, in dry woods and thickets. July. Aug. 



8. DIPLOPAPPUS, 



Heads many-flowered. Rays 8 12, pistillate. Disk-flowers 

 perfect. Involucre imbricate, with appressed scales, destitute of 

 green tips. Receptacle flat, alveolate. Pappus double, the ex- 

 terior of very short and stiff bristles ; interior copious, capillary. 

 Per. 



1. D. linariifolius. 



Bristly Aster. 



Stems long, often decumbent, somewhat rough, leafy, several from the same 

 root; leaves linear, 1-veined, rigid, smooth, shining above, very rough on the 

 margins, ending in a mucronate point; heads large, with numerous, deep-blue, 

 showy rays, solitary on the ends of the pubescent branches. A fine plant, 

 about 1 ft high, with very showy flowers. Common in dry soils. Sep. 



1. D. umbellatus. 



Umbelled Aster. 



Smooth ; stem tall, leafy ; leaves lanceolate, entire, acuminate, attenuate at 

 base, rough on the margin; heads very numerous, with white rays and yellow 

 disk, in a terminal, flat corymb; involucre-scales somewhat closely imbricated 

 and obtuse, oval-lanceolate. A tall, elegant species, 4 6 ft. high, often with a 

 purplish stem, and supporting a large, level corymb of white flowers. Com- 

 mon in low grounds. Aug. Sep. 



9. ERiGERON. 



Heads many-flowered, somewhat hemispherical. Rays nar- 

 row, very numerous, pistillate. Disk-flowers perfect. Recepta- 

 cle flat, naked. Involucre nearly in 1 row, with narrow, sub- 

 equal scales. Pappus mostly simple. 



1. E. bellidifolium. Eolnn's Plantain. 



Hairy; stem simple, nearly naked above; radical leaves obovate, obtuse, 

 slightly serrate, cauline ones distant, oblong-lanceolate, mostly clasping, entire, 

 acute ; heads large, with 60 70 broadly-linear, bluish-purple rays, in a close, 

 terminal corymb. A common and early species, 1 2 ft. high, in fields and 

 thickets. May Jane. Per. 



2. E. Philadelphicum. Purple Fleabane. 



Hairy; stem slender, leafy ; leaves thin, oblong, clasping at base, mostly en- 

 tire; heads with exceedingly numerous and narrow, reddish-purple, or flesh- 

 colored rays, broadly corymbcd at the summit of the stem. A common species 

 in thickets and fields, 13 ft high. June Aug. Per. 



3. E. annuum. Daisy Fleabane. 



Stem tall, furrowed, rough, pubescent, branching ; leaves hairy, closely ser- 

 rate, the lowest ovate, tapering into a winged petiole ; upper ones ovate-lanceo- 

 late, crowded, acute, tapering at base, sessile, the uppermost lanceolate ; heads 

 large, with very numerous, narrow, and short, white rays, tinged with purple, 

 corymbose at the summit of the stem. A tall plant, growing as a weed in 

 fields and waste places. Very common. August. An.andBien. 



4 E. strigosum. 



White-weed. 



Stem erect, branching, slender, furrowed, more or less pubescent and 

 rough ; leaves mostly entire, tapering at both ends, lowest ones oblong, or 

 spatulate, 3-veined, attenuate to a petiole, upper ones lanceolate ; heads small, 

 with rays twice as long as the involucre, and a yellow disk, in large, loose, ter- 

 minal, paniculate corymbs. A weed in fields, equally common with the last, 

 about 2 ft high, and a much more slender plant. June Sep. An or Sien. 



5. E. Canadense. Fleabane. 



Hairy ; stem erect, furrowed, with numerous short branches ; leaves linear- 

 lanceolate, or linear, mostly entire, radical ones incised ; heads very numerous, 

 small, with numerous white rays scarcely longer than the involucre, racemose 

 on the branches, forming a long, terminal panicle. A common weed in wasto 

 places, varying greatly in size and form, 6' 6 ft in height July. Oct. An. 

 and Men. 



10. CALLlSTEPHUS. 



Ray-flowers pistillate, numerous ; disk-flowers perfect. In- 

 volucre hemispherical. Receptacle somewhat convex Pappus 



