DiPLOPAPPLs. LXXV. COMPOSITE. 325 



a spreading panicle of heads which are below the middle size and furnished 

 with snow-white rays. July — Sept. 



41. A. FLExuosus. Nutt. (A. sparsiflorus. Ph.) Fexv-Jloioered Aster. 



St. branching, slender, flexuous, very smooth ; lis. long and succulent, the 

 lower ones sublanceolate-linear, upper ones subulate; branches leafy, 1-flow- 

 ered; invol. scales lanceolate, acuminate, appressed; rays numerous, shorter 

 than the involucre. Grows in salt marshes, Mass. to Flor. The whole plant 

 very smooth, If high, with large, purple flowers; disk yellow. Aug. — Oct. 



42. A. LiNiFOLius. (A. subulatus. Michx.) Sea Aster. 



St. paniculate, much branched from the base ; Its. long, linear, very acute 

 the uppermost subulate; invol. cylindric with. subulate scales; radical hds. mi- 

 nute. — An annual species, found in salt marshes, Mass. to Car. Stem 12 — 18' 

 high, very smooth, thick, reddish. Leaves smooth, sessile. The plant is very 

 branching, with numerous short-ra3'ed, small, purple flowers. Aug. 



11. SERICOCARPUS. Nees. 



Gr. ariptKos, silken, KapTro;, fruit; from the character of the genus. 



Heads few-flowered; ray -flowers 4 — 6,9; disk-fls. 6 — 10, $; in- 

 volucre oblong, imbricated ; scales appressed, with green, spreading 

 tips ; receptacle alveolate ; achenium obconic, very silky ; pappus 

 simple. — '4 Herbs with alternate leaves and close corymbs. Rays white. 



1. S. soLiDAGiNEL's. Nees. (Aster solidaginoides. Michx.) 



Smooth ; Ivs. linear-lanceolate, obtuse, entire, sessile, obsoletely 3-veined 

 rough on the margin ; corymb fastigiate ; hds. aggregate, subsessile, 5-rayed • 

 scales obtuse, white, with green tips. — In woods, Can. to La. Not common! 

 Stem slender, simple, about 2f high. Leaves smooth, pale green, 1 — 2' by 3—! 

 5". Heads rather small, in a level-topped corymb. Involucre oblong. Scales 

 imbricate, appressed, with conspicuous green tips. Rays long, white. Jl. Au°-. 



2. S. coNYZoiDES. Nees. (Aster. Willd. Conyza asteroides. Linn.) 

 S/!. somewhat pubescent, simple, corymbose at top; hs. oval-lanceolate 



smooth beneath, slighly 3-veined, narrowed at base, acute, the upper ones ses- 

 sile, nearly entire, the lower narrowed into the petiole, serrate ; invol. cvlindri- 

 cal, the .scales oval, obtuse, appressed, slightly reflexed at summit; raysb, short. 

 — Common in woods and thickets, Mass. to Flor. Stems somewhat 5-an°-led 

 1 — 2f high. Leaves somewhat fleshy. Ray short, but longer than the disk' 

 white. July, Aug. ' 



12. DIPLOPAPPUS. Cass. 



Gr. SnrXooi, double, TraTTTrof, pappus; from the character. 



Heads many-flowered: ray-fls. about 12, 9; disk-fls. $; involucre 

 imbricate ; receptacle flat, subalveolate ; pappus double, the exterior 

 very short, interior copious, capillary ; achenium compressed. — % 

 Lvs. entire^ alternate. Rays cyanic. Disk yelloic. 



1. D. LiNARiiFOLirs. Hook. (Aster linariifolius. Linn.) 



St. straight, roughish ; branches 1-flowered, fastigiate ; scales of invol. im- 

 bricate, carinate, as long as the disk ; lvs. linear, entire, 1-veined, mucronate 

 carinate, rough, rigid, those of the branches recurved. — A handsome species' 

 in dry woods, along streams, U. S. and Can., rather rare. Stems subsimple| 

 purplish, about a foot high, decumbent at base. Leaves numerous, rigidly up- 

 right or recurved, obtuse, with a small, mucronate point, pale beneath, shining 

 above. Branchlets near the top, leafy, each with one rather large and showy 

 violet-colored head. Aug. Sept. ' 



2. D. UMEELLATUs. Hook. (A., amygdaliuus. Michx. A. umbellatus. Ait.) 

 St. smooth, straight, simple; co'rymb fastigiate; lvs. long, lanceolate, 



smooth, attenuate-acuminate at each end, rough on the margin ; inxol. scales 

 obtusely lanceolate. — A tall, handsome plant, growing in low groimds, river 

 banks and fields, N. Eng. to La. Stem 3— 4f high (in drv fields but 'l— 2) 



