470 



COMPOSITAE. 



VOL. III. 



i. Rudbeckia triloba L. Thin-leaved 

 Cone-flower. Fig. 4442. 



Rudbeckia triloba L. Sp. PI. 907. 1753. 



Stem somewhat pubescent and rough, rarely 

 glabrate, branched, 2-5 high. Leaves thin, 

 rough on both sides, bright green, the basal 

 and lower ones petioled, some or all of them 

 3-lobed or 3-parted, the lobes lanceolate or ob- 

 long, acuminate, sharply serrate; upper leaves 

 ovate, ovate-lanceolate, or lanceolate, acumi- 

 nate or acute, narrowed to a sessile base or 

 into short margined petioles, serrate or entire, 

 2'~4' long, \'-\' wide ; heads nearly 2' broad, 

 corymbed ; bracts of the involucre linear, 

 acute ; pubescent, soon reflexed ; rays 8-12, 

 yellow, or the base orange or brownish-purple ; 

 disk dark purple, ovoid, about 6" broad ; chaff 

 of the receptacle awn-pointed; pappus a mi- 

 nute crown. 



In moist soil, New Jersey to Georgia, west to 

 Michigan, Minnesota, Missouri, Kansas and Louisi- 

 ana. Sometimes escaped from gardens to road- 

 sides. Brown-eyed susan. June-Oct. 



2. Rudbeckia subtomentosa Pursh. Sweet 

 Cone-flower. Fig. 4443. 



Rudbeckia subtomentosa Pursh, Fl. Am. Sept. 575. 1814. 



Densely and finely cinereous-pubescent and scabrous ; 

 stem branched above, 2-6 high. Leaves thick, some 

 or all of the lower ones deeply 3-lobed or 3-parted, 

 petioled, 3'-5' long, the lobes oblong or lanceolate, acute 

 or acuminate, dentate; upper leaves, or some of them, 

 lanceolate or ovate, acuminate, sessile or nearly so ; 

 heads numerous, 2'~3' broad ; rays 15-20, yellow, or 

 with a darker base ; disc subglobose, rounded, purple 

 or brown, 6"-8" broad; bracts of the involucre linear- 

 lanceolate, acuminate, squarrose, sweet-scented ; chaff 

 of the receptacle linear, obtuse or obtusish, pubescent, 

 or somewhat glandular at the apex; pappus a short 

 crenate crown. 



On prairies and along rivers, Illinois to Louisiana, Kan- 

 sas and Texas. July-Sept. 



3. Rudbeckia hirta L. Black Eyed Susan. 

 Yellow Daisy. Fig. /\/\/\/\. 



Rudbeckia hirta L. Sp. PI. 907. 1753. 



Hirsute or hispid throughout, biennial or some- 

 times annual ; stems simple or sparingly branched, 

 often tufted, i-3 high. Leaves thick, sparingly 

 serrate with low teeth, or entire, lanceolate or ob- 

 long, the lower and basal ones petioled, mostly ob- 

 tuse, 3-S-nerved, 2'-? long, '-2' wide, the upper 

 sessile, narrower, acute or acutish ; heads commonly 

 few or solitary, 2'-^' broad ; rays 10-20, orange or 

 orange-yellow, rarely darker at the base; bracts of 

 the involucre very hirsute, spreading or reflexed, 

 much shorter than the rays ; disk globose-ovoid, 

 purple-brown ; chaff of the receptacle linear, acute 

 or acutish, hirsute at the apex; style-tips acute; 

 pappus none. 



Prairies and plains, Ontario to Manitoba, Florida, 

 Colorado and Texas. Widely distributed in the east as 

 a weed, north to Quebec. Races differ in pubescence 

 and in length and color of the rays. Nigger- or darkey- 

 head. Nigger- or poor-land daisy. Golden-Jerusalem. Yel- 

 low ox-eye-daisy. English bull's-eye. Brown daisy or betty. Brown-eyed susan. May-Sept. 



Rudbeckia monticola Small, of the southern Alleghanies, with broader, ovate, acute or acumi- 

 nate stem leaves, is recorded as extending northward into Pennsylvania. 



