986 



FLORA. 



Mex. In addition to the following, some 25 others occur in the southern and west- 

 ern U. S. 



* Stem-leaves not cordate-clasping : achenes 4-angled. 



Disk globose or ovoid and purple or dark brown in fruit; lower leaves entire or lobed. 

 Lower leaves deeply 3-lobed or 3-divided. 



Plant more or less hirsute; leaves thin; chaff awned. i. R. tnloba. 



Plant scabrous ; leaves thick ; chaff blunt, pubescent at apex. 



2. R. subtomentosa. 

 Leaves neither 3-lobed nor 3-divided. 



Plants hispid ; chaff acute or acutish, hirsute at summit; style-tips subulate. 

 Stem-leaves lanceolate, ovate to oblong; involucre shorter than the rays. 

 Upper stem-leaves narrowly lanceolate, entire or nearly so. 



3. R. hirta. 

 Upper stem-leaves ovate to ovate-lanceolate, mostly toothed. 



4. R. monticola. 

 Stem-leaves oval to obovate ; involucral bracts foliaceous, nearly as long as 



the rays. 5. R. Brittonii. 



Plants pubescent, hirsute or glabrate; style-tips obtuse. 

 Leaves denticulate or entire; rays 1.8-2.5 cm. long. 



Stem-leaves oblong, ovate or oblong-lanceolate ; disk 10-16 mm. broad, 

 subglobose. 



Basal leaves oval, acute or acutish, sparingly pubescent. 



6. R.fulgida. 

 Basal leaves narrowly oblong, obtuse, hirsute. 



7. R. Missouriensis. 

 Basal leaves broadly ovate to orbicular, cordate, obtuse, slightly 



pubescent. 8. R. palustris. 



Stem-leaves obovate or spatulate ; disk 8-10 mm. broad, depressed. 



9. R.spathulata. 

 Leaves dentate or laciniate ; rays about 3.5 cm. long. 



Stem-leaves elongated-lanceolate. 10. R. speciosa. 



Stem-leaves ovate-lanceolate. u. R. Sullivantii. 



Disk elongated or cylindric in fruit, yellowish or gray; lower leaves pinnately divided or 



pinnatihd. 12. R. laciniata. 



'* * Stem-leaves cordate-clasping; achenes nearly terete, striate. 13. R. amplextcaulis. 



1. Rudbeckia triloba L. THIN-LEAVED CONE-FLOWER. (I. F. f. 3883.) 

 Stem somewhat pubescent and rough, rarely glabrate, branched, 6-15 dm. high. 

 Leaves rough on both sides, bright green, the basal and lower ones petioled. the 

 lobes lanceolate or oblong, acuminate, sharply serrate; upper leaves ovate, ovate- 

 lanceolate, or lanceolate, acuminate or acute, narrowed to a sessile base or into 

 short margined petioles, serrate or entire, 5-10 cm. long, 1-2.5 cm - wide; heads 

 nearly 5 cm. 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 12 mm. broad; pappus a minute crown. In moist soil, N. J. 

 to Ga., west to Mich., Kans. and La. June-Oct. 



2. Rudbeckia subtomentosa Pursh. SWEET CONE- FLOWER. (I. F. 3884.) 

 Densely and finely cinereous-pubescent and scabrous; stem branched above, 6-18 

 dm. high. Leaves thick, the lower ones petioled, 7-12 cm. long, the lobes oblong 

 or lanceolate, acute or acuminate, dentate; upper leaves, or some of them, lanceo- 

 late or ovate, acuminate, sessile or nearly so; heads numerous, 5- 7 cm. broad; rays 

 15-20, yellow, or with a darker base; disk subglobose. rounded, purple, 12-16 mm. 

 broad; bracts of the involucre linear-lanceolate, acuminate, squarrose. sweet- 

 scented; pappus a short crenate crown. On prairies and along rivers, 111. to La., 

 Kans. and Tex. July-Sept. 



3. Rudbeckia hirta L. BLACK-EYED SUSAN. YELLOW DAISY. (I. F. f. 

 3885.) Biennial or sometimes annual; stems simple or sparingly branched, often 

 tufted. 3-9 dm. high. Leaves thick, sparingly serrate with low teeth, or entire, the 

 lower and basal ones petioled, mostly obtuse, 3~5-nerved, 5-17 cm. long. 1-5 cm. 

 wide, the. upper sessile, narrower, acute or acutish ; heads commonly few or solitary, 

 5-10 cm. broad; rays 10-20, orange, rarely darker at the base; bracts of the 

 involucre very hirsute, spreading or reflexed; disk globose-ovoid, purple-brown; 

 pappus none. In fields, Quebec to western Ont. and the N. W. Terr., south to 

 Fla., Colo, and Tex. Widely distributed in the east as a weed. May -Sept. 



