252 COMPOSITE. (COMPOSITE FAMILY.) 



36. S. Drummondii, Torr. & Gray. Stem (1-3 high) and lower sur- 

 face of the broad/// ovate or oval somewhat triple-ribbed leaves minutely velvet i/- 

 pubescent, some of the leaves almost entire ; racemes panicled, short ; scales of 

 the involucre oblong, obtuse; rays 4 or 5. S. W. 111., Mo., and southward. 

 i- -t- -t- -i- Heads in a compound corymb terminating the simple stem, not at all 



racemose ; leaves mostly with a strong midrib. 

 <-+ Leaves flat, not 3-nerved. 



37. S. rigida, L. Rough and somewhat hoar// with a minute pubescence ; 

 stem stout (2 - 5 high), very leafy ; corymb dense ; leaves oval or oblong, copi- 

 ously feather-veined, thick and rigid ; the upper closely sessile by a broad base, 

 slightly serrate, the uppermost entire ; heads large, over 30-flowered ; the rays 

 7-10. Dry soil, N. Eng. to Minn., and southward. 



38. S. Ohioensis, Kiddell. Very smooth throughout ; stem waud-like, 

 slender, leafy (2-3 high) ; stem-leaves oblong-lanceolate, flat, entire, obscurely 

 feather-veined, closely sessile; the lower and radical ones elongated, slightly 

 serrate toward the apex, tapering into long margined petioles; heads numer- 

 ous, on smooth pedicels, small, 16-20-flowered; the rays 6 or 7. Moist 

 meadows or prairies, W. New York to Intl. and Wise. Root-leaves 1 long; 

 the upper reduced to 1 - 2', with rough margins, like the rest. 



M- -M. Leaves somewhat folded , entire, the lower slightly 3-nerved. 



39. S. Riddellii, Frank. Smooth and stout (2-4 high), very leafy, the 

 branches of the dense corymb and pedicels rough-pubescent ; leaves linear-lance- 

 olate, elongated (4-6' long), acute, partly clasping or sheathing, mostly recurved, 

 the lowest elongated-lanceolate and tapering into a long keeled petiole ; heads 

 very numerous, clustered, 20 - 30-flowered ; the rays 7-9. Wet grassy prai- 

 ries, Ohio to Minn, and Mo.; Ft. Monroe, Va. Heads larger than in the 

 last, 2-3" long. Stem-leaves upright and partly sheathing at the base, then 

 gradually recurved-spreading. 



40. S. Houghtonii, Torr. & Gray. Smooth ; stem rather low and slender 

 (1-2 high); leaves scattered, linear-lanceolate, acutish, tapering into a nar- 

 rowed slightly clasping base, or the lower into margined petioles; heads few 

 or several, 20 - 30-flowered ; the rays 7-9. Swamps, north shore of Lake 

 Michigan; Genesee Co., N. Y. July, Aug. Leaves rough-margined, 2-5' 

 long, 2-4" wide, 1 -nerved, or the lower obscurely 3-nerved above; veins 

 obscure. Heads large, nearly \' long. Scales of the involucre obtuse. 



2. EUTHAMIA. Corymbosely much branched ; heads small, sessile, in little 

 clusters crowded in fiat-topped corymbs ; the closely appressed itivolucral. 

 scales somewhat glutinous; receptacle Jimbrillate ; ra//s 6-20, short, more 

 numerous than the disk-flowers ; leaves narrow, entire, sessile. 



41. S. lanceolata, L. Lea ves lanceolate-linear, 3- 5-nen-ed ; the nerves, 

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

 cylindrical, in dense corymbed clusters; rays 15-20. Kiver-bauks, etc., in 

 moist soil ; common. Stem 2-3 high ; leaves 3-5' long. 



42. S. tenuif61ia, Pursh. Smooth, slender ; leaves very narrowly linear, 

 mostly l-nerved, dotted ; heads obovoid-club-shaped, in numerous clusters of 2 

 or 3, disposed in a loose corymb ; rays 6-12. Sandy fields, Mass, to 111., and 

 southward ; common near the coast. 



