RuDBEOKiA. LXXV. COMPOSITE.. 337 



29. HE LI OPS IS. 



Ol'. >'i\ios, the sun, oJpis, appearance; flowers radiant like the sun. 



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

 9 ; disk ? ; receptacle chaffy, conical, the paleaj lanceolate ; achenia 

 4-sided ; pappus 0. — %■ Lvs. opposite. lids', large. Fls. yellow. 

 H. L^vis. Pers. (Helianthus. Limi.) Ox-cyc. 



St. smooth ; lis. 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 — & 

 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. 



p. gracilis. T. & G. (H. gracilis. Null.) Small and slender; lvs. scabrous, 

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



y. scabra. T. & G. (H. scabra. Honk.) St. and lvs. scabrous and yellowish- 

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

 in la. ! 



30. RUDBECKIA. 



Dedicated to the celebrated Glaus Rudbeck, 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 

 pale£B or chaff; pappus 0, or a 4-toothed margin. — % Lvs. alternate. 

 Hds. large. Rays yellow. 



* Disk pale green or purplish. 



1. R. LACINIATA. 



Glabrous; lower lvs. pinnate, segments 3-lobed, tipper 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 distinguishe'd 

 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. Rays 1 — 2' long, oblanceolate, bright 

 yellow, spreading or drooping. Aug. 



2. R. SUBTOMENTOSA. Ph. 



SL branching, tomentose-pubescent ; Its. petiolate, hispid-scabrous above, 

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

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

 disk purplish-brown ; rays large, spreading. — A coarse, rough species, 3 — it' 

 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. TRU^OEA. 



Hirsute ; branches panicled, spreading ; loicer cauline lvs. mostly 3-lobed, 

 coarsely serrate, acuminate ; upper ovate-lanceolate, so.newhat clasping, ser- 

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

 lobed, petiolate; hds. 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 — i' long, 

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

 at the summit. Aug. Sept. 



4. R. HiRTA. Rough Cone-Jlowei'. 



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

 lvs. ovate-spatuiate, 3-veined, petiolate, denticulate, the upper ones sessile, 

 ovate-lanceolate ; intol. scales numerous, narrow, imbricatetl in 3 rows ; rays 

 spreading. — A showy plant, in dry soils, Mass. Richard 1 Western N. Y. ! to 

 La. and \^. ! Stems subsimple or branching from the base, covered with prickly 



