168 ORDER 70. COMPOSITE. 



13 S. virgaiirea L. /?. alpina (Bw.) St. dwarf, furrowed, simple; Ivs. oral, sub- 

 serrate or entire, narrowed to a petiole, tipper lanceolate ; hds. few (1 9), large, rays 

 1012 ; BC. acute, very thin. Tops of high rnts. Me. to N. Y., shores of L. Sup. 86'. 

 J-. glomerata. Taller ; Ivs. ovate-oblong, serrate ; hds. very large. Mts. N. Car. 



13 S. liumilis Ph. Glabrous, simple ; Ivs. oblanceolate, crenate-serrate, acute, the lower 

 obtuse, petiolate ; rac. paniculate ; hds. middle-size, about 12-flwd. ; sc. obtuse. Mt. 

 streams, N. H. and N. 612' 2f. Varies with the branches pubescent above. 



14: S. virgata MX. Tall, virgate, with a simple raceme at top ; Ivs. thickish, entire, ob- 

 lanceolate, the lower Bubserrate, petiolate: hds. about 15-flwd., rays 67; fr. pubescent. 

 Damp pine-barrens, N. J. to Fla. 3 5f. Rac. 6' If. long, of small clusters. 



15 S. stricta Ait. Strict, simple; Ivs. lanceolate, lower serrate, very long-petiolato, 

 upper entire, panicle slender ; heads 10-12-flowered ; scales obtuse ; rays 5 or 6. Wet 

 woods, N. 2f. 



16 S. speciosa N. Stout, simple ; Ivs. lanceolate, entire, thick, lower very broad, sub- 

 serrate, petiolate ; panicle thyrsoid ; ped. pubescent ; rays, 6 8, large. Thickets : not 

 common. 8 6f. Very handsome. Varies with the panicle slender or virgate. 



17 S. verna Curtis. Hoary-pubescent; stem few-lvd., loosely paniculate; Ivs. ovate to 

 lance-ovate, the lower finely serrate; rays, 10 12. Barrens, S. Fls. in May, June. 



18 S. puberola N. Puberulent as if dusty, strict, simple; Ivs. oblanceolate to lanceolate, 

 the lower subserrate ; pan. dense, compound ; sc. linear-subulate ; fls. 2025, rays about 

 10, elongated. In woods. Stem purplish, 2 3f. Heads rather large. 



19 S. sempervirens L. Lvs. thick, lanceolate, entire, obscurely 3-veined; hds. panicu- 

 late, 25-30-flwd., rays 8 10; ped. scabrous-pubescent. Marshes. S 6f. Handsome. 



20 S. angustlfolia Ell. Lvs. thick, entire, erect, 1-veined. the lower lanceolate ; pan. 

 dense, virgate ; hds, 15-20-flowered, rays 7; ped. glabrous. Swamps, S. 2 4f. 



21 S. pilosa Walt. Hirsute, tall, stout; Ivs. lance-oblong to lance-ovate, remotely 

 serrulate, rough ; rays minnte, 2 10, disk-fls. 5 6. Damp barrens, N. J. and S. 4-7f. 



22 S. odora Ait. St. terete, smoothish, slender ; Ivs. lin.-lanceolate, abrupt at base, 

 acute, pellucid-punctate ; rays 2-4, disk-fls. 31. Dry hills and woods. 2 3f. The 

 plant is yellowish-green, fragrant, and yields by distillation a fragrant oil. 



. retrorsa, LA'S, linear to snbulate, acute, often twisted ; rays 13. Ga. 



23 S. tortifolia Ell. St. rough -pubescent ; Ivs. many, linear, small, subentire, mn 

 punctate, often twisted at base ; t c. obtuse ; rays 3-5, disk-fls. 3-5. Dry fields, S. 2-3f. 



24 S. nemoralis Ait. Dusty- snbtomentous; Ivs. obscurely 3-veined, roughish, acute, 

 attenuate at base ; hds. small ; fie. 1015, rays 5 6, conspicuous. Dry fields, roadsides. 

 l-2f. Varies with stem much branched, or with stem and panicle simple and slender. 



25 S. rupestris llaf. Smooth, slender ; Ivs. linear-lanceolate, plainly 3-vcined ; hds. 

 small, in a pimple panicle ; fls. 15, rays very short. Rocky banks, Ind. Ky. 2 3f. 



26 S, L.cavenwortliii T. & G. St. minutely downy, very leafy; Ivs. smooth, lin.- 

 lanceolate, entire above ; panicle open ; heads rather large ; ray and disk flowers each 

 10-12. Damp soils, South. 23 feet high. 



27 S. Missouriensis N. Low, piirp!e; lv<?. lance-lin., tapering both ways, shining, 

 the lowest oblanceolate, with slender ccnvtvucs ; rac. small, dense ; pedicels glabrous 

 hds. small, 12-15-flwd. ; sc. with greenish tips ; rays about 8. Dry prairies, 111. Mo. l-2f. 



28 S. serotina Willd. St. terete, striate, ta. 1 !;. 'vs. slightly serrate, lin.-lanceolate, veins 

 beneath pubescent ; ped. pubescent ; hds. e?mill, 15-20-flwd. Low grounds. 3-6f. 



29 S. glgantea Ait. St. striate, tall ; Ivs. lanceolate, with sharp, spreading scrratures ; 

 strongly 3-veined ; pan. downy-hirsute ; hds. 15-20-flwd. 4-7f. Generally much branched. 



30 S. Canadensla L. St. downy ; Ivs. lanceolate, acuminate, rough ; hds. very numer- 

 ous and small ; fls. 1217, rays short and obscure, about 7. Copses, hedges : com. 2-5f. 



ft. procera St. and Ivs. beneath villous ; hcls. and rays larger. Low grounds. 4 7f. 



31 S. Sliortii T. & G. St. minutely rough-downy; Ivs. lance-oblong, acute, smooth 

 pan. contracted, elongated ; sc. with greenish tips ; fls. 10-15, rays 5-7. O. Ky. 2f. 



33 S. gracillima T. & G. Smooth, slender; Ivs. lance-spatulate, obtuse, to linear, 

 entire ; panicle narrow, hd'. 9-12-flowered, scales obtuse : rays 0. Barrens, Fla. 2f. 



