Ossyma. 'JO.— COMPOSITjE. 444 



3 Z. pauciflomm, with bright yellow flowera is Bomotimes cultivated. 



49. HELIOP'SIS, Pers. Ox-eyb, (Gr. fjXiog, the sun, '6ipig, appear- 

 ance ; flowers radiant like the sun.) Hds. radiate ; involucre imbricate, 

 with ovate, subequal scales ; rays linear, large, § ; disk i^ ; receptacle 

 chaffy, conical, the pales lanceolate ; achenia 4-sided ; pappus 0. — U 

 Lvs. opposite. Hds. large. P'ls. yellow. (Helianthus, L.) 



H. l^vis Pers. St. smooth ; Its. ovate-oblong, coarsely serrate, potiolate, 3- 

 veined, smooth beneath, upper ones usually lanceolate, lower ones more or leas 

 truncate at base. — A large, symmetrical plant, in hedges and thickets, U. S. St. 

 angular, striate, di- or triohotomously branched above, 3 to 5f high. Lvs. 2 to 

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

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

 and obtuse at summit. Jn., Jl. 



/3. GE^OlLis. Small and slender; lvs. scabrous, ovate-lancoolato, acute .it 



base. — 2f high. (H. gracilis, Nutt.) 

 y. soXbba. St. and lvs. scabrous and yoUowiah-groen ; lvs. somewhat deltoid, 

 distinctly truncate at base. — 6f high. Common in Ind. (H. soabra, Hook.) 



50. TETRAGONOTHEXA, Dill. (Gr. rerpa, four; yow, angle; O^kt/, 

 envelope.) Heads radiate ; involucre double, the outer of 4 leafy bracts 

 united at base, the inner of 8 small scales similar to the chaff of the 

 conical receptacle; achenia smooth, truncate, destitute of pappus. — 2[ 

 Herb clothed with viscid hairs, opposite lvs., with yellow-flowered, 

 large hds. 



T. helianthoides L. Sandy soils, Ya. to Fla. and Ala. A stout, coarse, un- 

 sightly herb, 2f high. Lvs. ovate, sessile, repaud-toothed, 3 to 5' long. Hds. 1 

 or fow, on long peduncles, the rays spreading nearly 3'. Cor. strongly veined. 

 Apr. — Jn. 



51. ECHINA^CEA, Mcench. Purple Cone-flower, [(dr. ixtv(K< 

 the hedgehog ; from the character of the pales.) Heads radiate ; invo- 

 lucre, scales in 2 rows; ray flowers neutral; disk flowers Q ; receptacle 

 conic, with rigid, mucronate pales; achenia 4-angled; pappus 0. — 2^ 

 Lvs. alternate. Eays purple, pendulous. (Rudbeckia, L., Nutt.) 



1 E. purpiirea Moencli. Tery rough; lower lvs. broad-ovate, h^eined, attentate 

 at base, remotely toothed ; cauline lanceolate-ovate, acuminate, nearly entire ; rays 

 12 to 15, very long, deflexed, bind. — Thickets and barrens, W. and S. States. 

 Plant showy, 4f high, branched. Lvs. 4 to 8' long, rough with short, stiff bristles, 



.3-veined. Hds. large, solitary, on long ped. Disk thickly beset with the stifl', 

 pointed, brown chaff. Rays 2 to 3' long, pendulous, rarely varying to white, 

 t JL— Sept. 



2 E. angustifolia DC. St hispid, subsimple, slender, naked above ; lvs. entire, 

 hispidly pubescent, 3-veined, lower lanceolate, petiolate, upper lance-linear, sessile ; 

 scales in about 2 rows, short; rays 12 to 15, slender, drooping. — Prairies and 

 marshes. 111., Mo. to Tex. Plant of a more slender habit than the last, 2 t* 3f 

 high. Hds. on long, naked ped. Rays 1 to 2' long, purple, varving to white. 

 Disk brown. May--Jl. 



52. RUDBECKI'A, L. (To the celebrated Olaus Eudbeck, Professor 

 of Botany, at Upsal, Sweden.) Heads radiate ; involucre scales nearly 

 equal, leafy, in a double row, 6 in each ; ray-flowers neutral ; disk per- 

 fect; receptacle conic or columnar, with unarmed pales or chaff'; 

 achenia 4-angled; pappus none, or a lacerate or toothed margin. — 2i 

 Lvs. alternate. HdS. large. Kays yellow. 



S Rays large, drooping. Disk columnar, at least in frnlt Nos, 1, i 



§ Rays spreading. Disk dark purple, conical or rounded. (♦) 



* Leaves deeply lobed or parted, the upper undivided Noe. 3,4 



• Leaves unaivkled.— Pales of the disk whiti8h-do>vTiy Nos. 5, • 



— Pales dark purolo as well as tlie flowers Nob. 1—9 



