9 88 



FLORA, 



acute; rsiys 12-20, bright yellow, usually orange at the base; disk depressed- 

 globose, 10-16 mm. broad, brown -purple; chaff of the receptacle acute, ciliate or 

 naked; florets 5.5 0.5 ram. long; achenes 2.5-3 min - n *gh; pappus a short crown. 

 In moist soil, N. J. to Mich., south to Ala. and Ark. Aug. -Oct. 



11. Rudbeckia Sullivantii Boy n ton & Beadle. Sullivant's Cone-flower. 

 Perennial, 5-12 dm high. Stem-leaves ovate to ovate-lanceolate, the lower 15-20 

 cm. long. 4-8 cm. wide, their petioles 3-7 cm. long, the blade coarsely and irreg- 

 ularly serrate, more or less pubescent; heads several, 5-9 cm. broad; rays 10-15; 

 chaff acute, smooth or nearly so; florets 6. 5-7. 5 mm. long; achenes 3-4 mm. high. 

 Ohio and Michigan. 



12. Rudbeckia laciniata L. Tall or Green-headed Cone-flower. 

 1. F. f. 3890.) Perennial; much branched, glabrous, or nearly so, 1-3.5 mm - 



high. Leaves rather thin, minutely pubescent on the margins and upper surface, 

 broad, the basal and lower ones long-petioled, often 3 dm. wide, the segments 

 variously toothed and lobed; stem-leaves shorter-petioled, 3-5-parted or divided, 

 the upper ones much smaller, 3-lobed, dentate or entire; heads several or numer- 

 ous, 6-10 cm. broad; rays 6-IO, bright yellow, drooping; bracts of the involucre 

 unequal; chaff of the receptacle truncate and canescent at the apex; pappus a 

 short crown. In moist thickets, Quebec to Manitoba and Mont., south to Ha., 

 Kans. and N. Mex. July-Sept. 



Rudbeckia laciniiita humilis A. Gray. Simple or branched, glabrous or nearly so, 

 3-6 dm. high, some or allot the basal leaves orbicular and undivided; heads 4-6 cm. broad; 

 disk globose or ovoid. Va. and N. C. to Tenn. and Ga., mostly in the mountains. 



13. Rudbeckia amplexicaulis Vahl. Clasping leaved Cone-flower. 

 (I. F. f. 3891.) Annual; glabrous throughout, somewhat glaucous; stem branched, 

 grooved, 3-6 dm. high, the branches ascending. Leaves entire, or sparingly 

 toothed, i-ribbed, reticulate-veined, the lower oblong to spatulate, sessile, the 

 upper ovate, ovate-oblong, or lanceolate, acute ; heads solitary at the ends of the 

 branches, long-peduncled, about 5 cm. broad; bracts of the involucre few, lance- 

 olate, acuminate; rays yellow, or sometimes brown at the base; disk ovoid-oblong, 

 often becoming 25 mm. high; achenes striate and transversely wrinkled, obliquely 

 attached to the elongated receptacle; chaff at length deciduous; pappus none. In 

 wet soil, Kans. and Mo. to La. and Tex. June-Aug. 



61 RATIBIDA Raf. [LEPACHYS Raf.] 

 Mostly perennial herbs, with alternate pinnately divided or parted leaves, and 

 long-peduncled terminal heads of tubular and radiate flowers, the disk-flowers gray 

 or yellow, becoming brown, the rays yellow, or with brown bases, drooping or 

 spreading. Involucral bracts in 2 or 3 series. Disk globose, oblong, or cvlindric. 

 Receptacle columnar to subulate, the concave chaff subtending or enveloping the 

 disk-flouers, truncate, the tips inflexed, canescent. Ray-flowers neutral. DislJ 

 flowers perfect, fertile, their corollas with scarcely any tube. Achenes short, fat- 

 tened, sharp-margined, or winged, at length deciduous with the chaft. Pappus 

 with I or 2 teeth, or none. [Name unexplained.] About 4 species, of N. Am. 



Style-tips lanceolate-subulate; leaf-segments lanceolate; rays 25-75 mm - long:. 



1. R. pinnata. 

 Style-tips short, blunt ; leaf-segments linear ; rays 6-30 mm. long. 



Disk cylindric, at length 2.5 cm. long or more; rays mostly equalling it, or longer. 



2. R. columnarim 

 Disk globose to short-oval, about 1 cm. high; rays mostly short. 3. R. Tagetes. 



I. Ratibida pinnata (Vent.) Barnhart. Gray-headed Cone-flowem 

 (I. F. f. 3892. ) Perennial; rough and strigose-pubescent throughout; stem branched 

 or simple, 0-15 dm. high. Leaves pinnately 3-7-divided. the basal ones sometimes 

 2.5 dm. Long, petioled, the segments cleft or entire, acute or acuminate; upper leaves 

 or nearly so, the uppermost commonly small and entire; bracts of the in- 

 volucre linear or linear oblong, short, reflexed; rays 4 IO. bright yellow, drooping; 

 disk oblong, gray or becoming brown, rounded, at length twice as long as thick; 

 the inner margin of achenes produced into a short tooth. On dry prairies, western 

 N. Y. to Fla.. west to S. Dak., Neb. and La. June-Sept. 



