4i8 



COMPOSITAE. 



[Vol. III. 



Rudbeckia laciniata hiimilis A. Gray, Syn. Fl. i: Part 2, 262. 1884. 

 Simple or branched, glabrous or nearly so, i-2 high, some or all of the basal leaves orbicular 

 and undivided; heads iW-2%' broad; disk globose or ovoid. Virginia and North Carolina to Ten- 

 nessee and Georgia, mostly in the mountains. 



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



(Fig. 3891-) 



Rudbeckia amplexicaulis Vahl. Act. Havn. 2: 29. pi. 

 4. 1783. 



Annual; glabrous throughout, somewhat glaucous; 

 stem branched, grooved, i-2 high, the branches C 

 ascending. Leaves entire, or sparingly toothed, 1- 

 ribbed, reticulate-veined, the lower oblong to spatu- 

 late, sessile, the upper ovate, ovate- oblong, or lance- 

 olate, acute, cordate-clasping; heads solitary at the 

 ends of the branches, long-peduncled, about 2' 

 broad; bracts of the involucre few, lanceolate, acu- 

 minate; rays yellow, or sometimes brown at the 

 base; disk ovoid-oblong, often becoming \' high; 

 achenes not angled, striate and transversely wrin- 

 kled, obliquely attached to the elongated receptacle; 

 chaff at length deciduous; pappus none. 



In wet soil, Missouri to Louisiana and Texas. June- 

 Aug. 



61. RATIBIDA Raf. Am. Month. Mag. 2: 268. 1818. 

 [Lepachys Raf. Journ. Phys. 89: 100. 1819.] 



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

 cled 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 cylindric. Receptacle columnar to subulate, the con- 

 cave chaff subtending or enveloping the disk-flowers, truncate, the tips inflexed, canescent. 

 Ray-flowers neutral. Disk-flowers perfect, fertile, their corollas with scarcely any tube. 

 Achenes short, flattened, sharp-margined, or winged, at length deciduous with the chaff. 

 Pappus with 1 or 2 teeth, or none. [Name unexplained.] 



About 4 species, natives of North America. 

 Style-tips lanceolate-subulate; leaf -segments lanceolate; rays 1/-3' long, 



Style-tips short, blunt; leaf-segments linear; rays 3" -15" long. 



Disk cylindric, at length 1' long or more; rays mostly as long, or longer. 

 Disk globose to short-oblong, about %' high; rays mostly short. 



1. R. pinna la. 



2. R. columnaris. 



3. R. Tageles. 



Ratibida pinnata (Vent.) Barnhart. Gray-headed Cone-flower. 

 ^|& (Fig- 3892.) 



Rudbeckia pinnata Vent. Hort. Cels, pi. 7/. 1800. 

 Lepachys pinnata T. & G. Fl. N. A. 2: 314. 1842. 

 Ratibida pinnata Barnhart, Bull. Torr. Club, 24: 



410. 1897. 



Perennial; rough and strigbse-pubescent 

 throughout; stem branched or simple, 3-5 

 high. Leaves pinnately 3-7-divided, the basal 

 ones sometimes io' long, petioled, the segments 

 lanceolate-dentate, cleft or entire, acute or 

 acuminate; upper leaves sessile or nearly so, the 

 uppermost commonly small and entire; bracts of 

 the involucre linear or linear-oblong, short, re- 

 flexed; rays 4-10, bright yellow, i / -3 / long, 3"- 

 9/' wide, drooping; style-tips lance-subulate; disk 

 oblong, gray or becoming brown, rounded, at 

 length twice as long as thick; chaff of the re- 

 ceptacle canescent at the summit; achenes com- 

 pressed, acutely margined, the inner margin 

 produced into a short tooth. 



On dry prairies, Western New York to Florida, 

 west to Minnesota, Nebraska and Louisiana. June- 

 Sept. 



