228 COMl'OSIT^K. (CO.MPOSITIC 1 AMILV.) 



piiiiiatirul ; tlie middle ones 3-. 'i-partod ; tlic uppermost often undivided, toothed ; 

 disk yellowish, ovate or eoiiieal ; rays larj^e, droo|)in(; ; eiiatt' of the rcccptiiele 

 truneate, piibesecnt at the ajjex, about as long as tlie 3-anL;;Kd aehenia. (R. digi- 

 tata, Mill. 11. lu; vigata, PursA.) — Swamps, Florida, and northward. July and 

 August. — Leaves large. Kays 1'- 2' long. 



7. R. heterophylla, Toit. & Gray. Pubescent ; stem corymbose above ; 

 leaves coarsely serrate, rough above, tomcntosc beneath ; the lowest orbicular- 

 cordate or 3-5-partcd, on long petioles; the middle ones 3-lobed ; the upper- 

 most ovate, sessile and entire ; disk globose, yellowish ; rays drooping ; chaff of 

 the receptacle acute ; aehenia 3-sided. — Swamps, Middle Florida. August. — 

 Stem 3° -4° high. Leaves and heads much smaller than in the preceding. 



* * Dish columnar, elongated : stems tall, sinijila. 



8. R. maxima, Kutt. Smooth ; leaves large, mcmltranaccous, oval or 

 oblong, slightly toothed or entire, feather-veined, the lower, ones ])etioled, the 

 upjfcr clasping; head solitary, long-peduncled ; rays large, drooping. — Wet 

 pine barrens. West Florida and westward. August. — Stem 4° - 9° high. Low- 

 est leaves 8'- 12' long. Kays 2' long. 



9. R. nitida, Nutt. Smooth and shining ; stem tall, naked above ; leaves 

 rigid, oblong-laneeolatc, slightly toothed or entire, 3 - 5-ribbcd ; the lowest long- 

 petioled; the upper partly clasping, small ; ray.s large, drooj)ing; disk brown. 



— Borders of swampy thickets, Georgia, Florida, and westward. July. — Stem 

 30-50 high. Lowest leaves 4' - 6' long. 



* * * Lower leaves opposite : disk ovate, yellow : chaff of the receptacle cuspidate, 

 ribbed: aehenia biconvex, striate, hairi/, rounded at the apex: pappus none. 



10. R. ? Porteri, Gray. Rough with short scattered hairs ; stem panicu- 

 lately branched ; leaves lanceolate, entire, narrowed at each end, fringed at the 

 base ; exterior scales of the involucre linear, as long as the disk ; the interior 

 shorter, resembling the chaff of the receptacle ; rays 7 - 9, longer than the disk. 



— Stone Mountain, Georgia. — Stem 2° - 3° high. 



46. LEPACHYS, Raf. 



Scales of the involucre few and small. Chaff of the oblong or columnar 

 receptacle truncate and thickened at the apex. Aehenia flattened and margined. 

 Pappus 2-toothed or none Otherwise like Rudbeckia. — Perennials. Leaves 

 pinnately divided. Rays large, drooping, yellow. 



1 . L. pinuata, Torr. & Gray. Rough with short apprcssed hairs ; stem 

 •sparingly branched; divisions of the leaves 3-7, lanceolate, acute, serrate or 

 entire ; disk yellowish, oval or oblong, shorter than the rays ; pappus obscurely 

 2-toothed. (Rudbeckia tomentosa, Etl.)—T>ry soil. West Florida, Georgia, 

 and westward. July- Sept. — Stem 3° - 4° high. Rays 2' long. 



47. HELIANTHUS, L. Sunflower. 



Heads many-flowered ; the ray-flowers neutral ; those of the disk tubular and 

 perfect. Scales of the involucre imbricated in 3 or more rows, w ith or without 



