COMPOSITE.. (COMPOSITK FAMILY.) 24') 



•*- ■*- Scales of the involucre narrow, thin and membranaceous: racemes mostly elon- 

 gated and nnmeroHS, fonnimj a crowded amjite juinicle. (Tlicse all jjivsent in- 

 tcnnctliati' i'urins, and .should ratlier he ivjjarded as one jwlymorphous 

 species.) 



32. S. rup6stris, Kaf. 5/t/« smooth and slender (2° -.3° high); lcai:es 

 linear-lancioldte, ttijierinc] to both ends, smooth and (//uhrous, entire or nearly so ; 

 panicle narrow; heads very small; rays very short. — Kocky river-hanks, Kcu- 

 tueky and Indiana. 



33. S. Canadensis, L. Stem roii<jh-huiry, taW and stout (3° -6° liigh) ; 

 leaves lanaolate, pointed, sharply serrate (sometimes almost entire), more or less 

 pubescent beneath and rouijh above ; heads small ; rays vtry short. — Boiders of 

 thickets and Hclds : very common. — Varies greatly in the roughness and hairi- 

 ness of the stem and leaves, the latter oblong-lanceolate or elongated linear- 

 lanceolate ; — in var. procek.v, whitish-woolly underneath ; and in var. scXiuja 

 also very rough above, often entire, and rngo.se-veincd. 



K/ 34. S. serotina, Ait. Stem very smooth, tail and stout (4° -8° higli), often 



^^^ glaucous ; leaves lanceolate, pointed, serrate, ronghish above, smooth ereejit the veins 

 ""^•y^^juiuiderneath, ichich are more or less hairy ; rays short. — Thickets and low grounds : 



common. — Intermediate in character, and in the size of the licads and rays, 



between the hist and the next. 



35. S. gigantea, Ait. Stem stout (3^-7° high), smooth, often glaucous; 

 leaves quite smooth both sides, lanceolate, tapci'-pointed, ver}' sharply serrate, ex- 

 cept the narrowed base, rough-ciliate ; the ample panicle pubescent ; rays rather 

 lony. — Copses and fence-rows : common : — presenting many varieties, but with 

 decidedly larger heads and rays than in the preceding. Seldom very tall. 



§ 3. EUTHAMIA, Nutt. Corymbosely much branched: heads small, s>ssile, in 

 little clusters which are crowded in Jiat-topped corymbs; t/ie closely oppressed 

 scales of the involucre somewlmt glutinous: receptacle Jimbrillate : rays 6-20, 

 short, more numerous than the disk-flowers : Uaves narrow, entire, sessile, crowded 

 or fascicled in the a.rils. 



36. S. lanceolata, L. Leaves lanceolate-linear, S-t)-nervcd; the neiTcs, 

 margins, and angles of the branches minutely rough-pubescent ; heads obovoid- 

 cylindrical, in dense corymbcd clusters; rays 15-20. — River-banks, &c., in 

 moist soil : common. — Stem 2° -4° high : leaves 3' - 5' long. 



37. S. tenuif61ia, Tursh. Smooth, slender; leaves tery nairowly linear, 

 mosdy \-nerved, dollfd: beads obovoid-club-shajieil, in numerous clusters of 2 or 

 3, disposed in a loose corymb; rays G- 12. — Sandy fields, Massachusetts to 



^ Illinois, and southward : common near the coast. 



20. BIGELOVIA, DC. Ravi.ks.s GoLniix-noD. 



Heads 3- 4-flowered, the flowers all perfect and tubular: rays none. Invo- 

 lucre club-shaped, yellowish ; the rigid somewhat glutinous scales linear, closely 

 imbricated and apprcssed. Receptacle murow, with an awl-shaped j>rolongation 

 in the centre. Achenia somewhat oliconical, hairy. Pa])pus a single row ui' 

 capillary bristles. — A smooth perennial ; the slender stem (l°-2° high) sim- 

 ple or branched from the base, naked above, corymbose at the summit, bearing 



