252 coMPOSiTiK. (composite family.) 



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

 face of the broad! >j orate or oval someichat triple-ribbed leaves minutel>/ velvet j/- 

 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. 

 H- -1- ^- H- Heads in a compound corpnb terminating the simple stem, not at all 



racemose; leaves mostly with a strong midrib. 

 ++ Leaves flat, not S-nerved. 



37. S. rigida, L. Bough and someichat hoari/ 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 ui)per 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 wand-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 Ind. and Wise. — Root-leaves 1° long; 

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



++ ++ Leaves someichat folded, entire, the lower slightly S-nerved. 



39. S. Riddellii, Frank. Smooth and stout {2- A° high), very leafy, t\\Q 

 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, linea7-4anceolate, acntish, 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. EUTHAMLA. Corymbosely much branched ; heads small, sessile, in little 

 clusters crowded in fat-topped corymbs ; the closely appressed involucral 

 scales somewhat glutinous ; receptacle fmbrillate ; rays 6 - 20, sho7't, more 

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



41. S. lanceolata, L. Leaves lanceolate-linear, 3- 5-nerved; the nerves, 

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

 cylindrical, in dense corymbed clusters; rays 15-20. — River-banks, etc., in 

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



42. S. tenuifdlia, 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. 



