DiPLOPAPPca. LXXV. COMPOSlTiE. 325 



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

 with snow-white rays. July — Sept. 



41. A. FLEXuoscs. Nutt. (A. sparsiflorus. Ph.) Few-jlowered Aster. 



St. branching, slender, flexuous, very suiooth ; 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. GroM^s 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 ; Ivs. 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 verj' 

 ^ranching, with .numerous short-rayed, small, purple flowers. Aug. 



11. S ERIC OCA RPUS. Nees. 



Gr. arjpiKos, silken, KOpiro;, 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 obeonic, very silky ; pappus 

 simple. — % Herbs ioith alternate leaves and close corymbs. Rays ivhite. 



1. S. soLiDAGiNEUs. Nccs. (Aster solidaginoides. Michx.) 



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

 ro!%h 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. Aug. 



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



S/-. somewhat pubescent, simple, corymbose at top; Ivs. 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. cylindri- 

 cal, the .scales oval, obtu.se, appres.sed, slightly reflexed at summit; rays 5, short. 

 — ComnKm in woods and thickets, Mass. to Flor. Stems somewhat' 5-angled, 

 1 — 2fhigh. Leaves somewhat fleshy. Ray short, but longer than the disk, 

 white. July, Aug. 



12. D I P L O P A P P U S. Cass. 



Gr. ^ittXooj, double, Tran-jTof, 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 cyaiiic. Disk yellow. 



1. D. LiNARiiFoi.ius. Hook. (Astcr linariifoli US. Linn.) 



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

 bricate, carinate, as long as the di.sk; 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, obtuss, 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. uMBELLATus. Hoolc. (K. amvgdalinus. Michx. A. umbellatus. Ait.) 

 St. smooth, straight, simple; corymb fastigiate; lvs. long, lanceolate, 



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

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

 banks and fields, N. Eng. to La. Stem 3— 4f high (in dry fields but 1—2), 



