936 



FLORA, 



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

 em 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. 1. R. triloba. 



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. A', 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./ulgida. 

 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. 11. R. Sullivantii. 



Disk elongated or cylindric in fruit, yellowish or gray; lower leaves pinnately divided 01 



pinnatifid. 12. R. laciniata. 



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



i. 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 intc 

 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 darli 

 purple, ovoid, about 12 mm. broad; pappus a minute crown. In moist soil, N. J. 

 to ( la., west to Mich., Kans. and La. June-Oct. 



2. Rudbeckia subtomentosa Pursh. Sweet Cone-flower. (I. F. f. 3884. 

 Densely and finely cinereous-pubescent and scabrous; stem branched above, 6-1$ 

 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; ray 

 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, oftei 

 tufted. 30 dm. high. Leaves thick, sparingly serrate with low teeth, or entire, th< 

 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 lew or solitary 

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

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

 pappus none. In fields, Quebec to western Out. and the X. W. Terr., south t< 

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



