A. LXXV. COMPOSITE. 337 



29. HELIOPSIS. 



Gr. /(A'OJ, the sun, ot//tf, appearance; flowers radiant like the sun. 



Involucre imbricate, with ovate, subequal scales ; rays linear, large, 

 9 ; disk $ ; receptacle chaffy, conical, the palese lanceolate ; achenia 

 4-sided ; pappus 0. U Lvs. opposite. lids, large. FLs. yellow. 

 H. LJEVIS. Pers. (Helianthus. Linn.} Ox-eye. 



St. smooth ; Ivs. ovate-oblong, coarsely serrate, petiolate, 3-veined, smooth 

 beneath, upper ones usually lanceolate, lower ones more or less truncate at 

 base. A large, symmetrical plant, in hedges and thickets, U. S. Stem an- 

 gular, striate, di- or trichotomously branched above, 3 51' high. Leaves 2 6' 

 by 1 4', acute, distinctly 3-veined. Branches thickened at the summit, each 

 terminating with a large, solitary, yellow head. Rays lanceolate, broad at base 

 and obtuse at summit. June, Jl. 



/3. gracilis. T. & G. (H. gracilis. Nutt.) Sir all and slender; Ivs. scabrous, 

 ovate^-lanceolate, acute at base. 2f high. 



y. scabra. T. & G. (H. scabra. Hook.) St. and Ivs. scabrous and yellowish- 

 green ; Ivs. somewhat deltoid, distinctly truncate at base. 6f high. Common 

 in la.! 



30. RUDBECKIA. 



Dedicated to the celebrated Olaus Rudheck, prof, of Botany at Upsal, Sweden. 



Involucre scales nearly equal, leafy, in a double row, 6 in each ; 

 ray-flowers neutral ; disk perfect ; receptacle conic, with unarmed 

 paleae or chaff; pappus 0, or a 4-tpothed margin. ^ Lvs. alternate. 

 Hds. large. Rays yellow. 



* Disk pale green or purplish. 



1. R. LACINIATA. 



Glabrous; Imcer Ivs. pinnate, segments 3-lobed, upper ones ovate ; pappus 

 crenate. In the edges of swamps and ditches, Can. and U. S. A tall, showy 

 plant, resembling Helianthus, from which, however, it is readily distinguished 

 by its conical disk. Stem round, branching, 6 8f high. Leaves alternate, 

 ample, rough, upper ones generally ovate, the rest variously divided, toothed or 

 cut, petiolate. Flowers large, terminal. Raysl 2' long, oblanceolate, bright 

 yellow, spreading or drooping. Aug. 



2. R. SUBTOMENTOSA. Ph. 



St. branching, tomentose-pubescent ; Ivs. petiolate, hispid-scabrous above, 

 softly subtomentose beneath, serrate, the lower deeply 3-lobed or 3-parted, up- 

 per undivided, ovate, acuminate; Ms. corymbose; scales numerous, spreading; 

 disk purplish-broWn; rays large, spreading. A coarse, rough species, 3 If 

 high, prairies, &c., Western and Southern States. Stem angular, marked with 

 brown lines. Leaves 3 5' long, on petioles 1 24" long. Rays deep or orange 

 yellow, 10 15, about 1' long. July, Aug. 



* * Disk dark purple. 



3. R. TRILOBA. 



Hirsute ; branches panicled, spreading ; lower cauline Ivs. mostly 3-lobed, 

 coarsely serrate, acuminate ; upper ovate-lanceolate, somewhat clasping, ser- 

 rate or entire ; radical ones ovate or oval, obtuse, crenate-dentate or incisely 

 lobed, petiolate; Ms. rather small, disk dark purple, ovoid; rays about 8, broad- 

 oval, rather longer than the linear, reflexed scales. Fields, Middle and Western 

 States. A handsome species, 2 4f high, very branching. Leaves 2 4' long, 

 3-veined. Rays deep yellow, 6 10" long, | as wide. Chaff cuspidate-awned 

 at the summit. Aug. Sept. 



4. R. HIRTA. Rough Cone-flower. 



Very hirsute or hispid ; st. simple or somewhat branched ; ped. naked ; 

 Ivs. ovate-spatulate, 3-veined, petiolate, denticulate, the upper ones sessile, 

 ovate-lanceolate; inrol. scales numerous, narrow, imbricated in 3 rows; rays 

 spreading. A showy plant, in dry soils, Mass. Richard! Western N. Y. ! to 

 La. and la. ! Stem* subsimple or branching from the base, covered with prickly 



