422 COMPOSITAE. 



Bracts of the involucre lanceolate-acuminate, spreading-. 

 Leaves villous-pubescent beneath. 

 Leaves scabrous or puberulent beneath. 



21. 

 22, 



[Vol. III. 



H. tomenlosus. 

 H. tuberosus. 



i. Helianthus angustifolius L. 



Narrow-leaved or Swamp Sunflower. 



(Fig. 3898.) 



Helianthus angustifolius L. Sp. PI. 906. 1753. 



Perennial by slender rootstocks; stems branched 

 above, or simple, slender, rough or roughish above, 

 often hirsute below, 2-7 high. Leaves firm, entire, 

 sessile, linear, slightly scabrous, rarely somewhat ca- 

 nescent beneath, 2 / -j / long, i"-}," wide, the margins 

 revolute when dry, the upper ones all alternate, the 

 lower opposite; heads usually few, sometimes solitary, 

 2 / -3 / broad; involucre hemispheric, its bracts linear- 

 lanceolate, acute or acuminate, scarcely squarrose, pu- 

 bescent; receptacle slightly convex; disk purple; chaff 

 entire or 3-toothed; rays 12-20; achenes truncate, 

 glabrous; pappus usually of 2 short awns. 



In swamps, Long Island, N. Y. to Florida, Kentucky 

 and Texas, mainly near the coast. Aug. -Oct. 



2. Helianthus orgyalis DC. Linear- 

 leaved Sunflower. (Fig. 3899.) 



H. giganteus var. crinitus Nutt. Gen. 2: 177. 1818.? 

 Helianthus orgyalis DC. Prodr. 5: 586. 1836. 



Perennial by slender rootstocks; stems gla- 

 brous, branched near the summit, very leafy to the 

 top, 6-io high. Leaves sessile, entire, linear or 

 nearly filiform, or the lowest lanceolate, remotely 

 dentate and short-petioled, rough with mucronate- 

 tipped papillae, especially on the lower surface, 

 acuminate, d / -i6 / long, i // -4 // wide, the upper all 

 alternate and i-nerved, the lower commonly oppo- 

 site; heads numerous, about 2 / broad, terminating 

 slender branches; involucre nearly hemispheric, its 

 bracts linear-subulate to lanceolate, acuminate, 

 squarrose, ciliate; disk purple or brown; receptacle 

 convex, its chaff entire, or toothed, slightly ciliate; 

 rays 10-20; achenes oblong- obovate, glabrous, 2]/ 2 "- 

 2 ) // long, 2-4-awned. 



On dry plains, Nebraska and Colorado to Texas. Cultivated 



Sept.-Oct. 



3. Helianthus annuus L. Common 

 Sunflower. (Fig. 3900.) 



Helianthus annuus L- Sp. PI. 904. 1753. 



Stem hispid or scabrous, stout, branched above, 3 - 

 6 high, or in cultivated forms sometimes 15 high. 

 Leaves all but the lower alternate, broadly ovate, peti- 

 oled, 3-nerved, dentate or denticulate, acute at the 

 apex, rough on both sides, sometimes pubescent be- 

 neath, the lower cordate at the base, 3 / -i2 / long; 

 heads in the wild plant 3' -6' broad; disk dark purple 

 or brown ; involucre depressed, its bracts ovate or ob- 

 long, usually long-acuminate or aristate, hispid-ciliate; 

 chaff of the receptacle 3-cleft; achenes obovate-oblong, 

 appressed-pubescent, or nearly glabrous. 



On prairies, etc., Minnesota to the Northwest Territory, 

 Missouri and Texas. Much larger in cultivation; an occa- 

 sional escape in the east. Old names, Gold, Gloden, Larea- 

 bell. Its flowers yield honey and a yellow dye : its leaves 

 fodder; its seeds, an oil and food; and its stalks a textile 

 fibre. July-Sept. 



