480 SYXGENESIA 



[Sekecioxide* 



Smooth Heliofsts. 



Root perennial. Stem 2 to 4 feet high f smooth, di- or tri-chotomously branch- 

 ing al summit. Leaves 2 or 3 to 6 inches long, and 1 to 1 inches wide, varying 

 from ovate-lanceolate to oblong-ovate, and ovate, acute, serrate, mostly smooth 

 beneath, and sprinkled with short hairs on the upper surface, scabrous on the 

 margin, obtuse at base, or abruptly narrowed to a petiole half an inch to an inch 

 in length. Heads of flowers middle-sized, on long naked Btriate-sulcate terminal 

 peduncles; involucre pubescent, the outer leaflets foliaccous, lance-oblong, rather 

 obtuse, pubescent-! filiate ; rays yellow, an inch to an im h and half long, and 1 

 fourth to near half an inch wide. Akenesof the disk 1 angled, of the ra^ 3 angled 

 the outer side convex, -all truncate at apex, smooth, reddish brown. Receptacle 

 convex, chatty, the chair twice as long as the akenes. 



Ilab. Banks of streams : frequent. Ft. July-August. Fr. Sept. 



Obs. Collected by Dr. K. Miciiknkk, in 1827. It is probably the only species 

 in the U. Slates,— -if not the only one of the genus ;— and is liable to be mistaken) 

 by a young Botanist, for a llelianthus. 



§ 3. Rudbeckie^e. Heads radiate, with the ray neutral, in a sinclc series* 

 Akenes without coating, or beak, bald, or with an entire crown-form pappus. 



384. RUDBECKIA. L. 



[In honor of Olaus Rudbeck, father and son; Swedish Botanists.] 



Involucre spreading, the leaflets somewhat in a double series. Cor- 

 olla of the disk- funnel-form, with ereet teeth, and anthers included, 



of the ray entirely neutral. Akenes nearly square on a transverse 

 section, with a thick callous crown-form pappus, a large opigynous 

 disk, and a lateral areola. Receptacle conic, with chaffy braes. 



1. R. fttlgida, .lit. Stem hairy and scabrous, the branches virgately 

 elongated ; leaves oblong-lanceolate, denticulate, scabrous-pubescent, 

 narrowed at base, sessile, and subamplexicaul ; disk hemispherical. 

 Beck, Hot. p. 204. Icon, Hart. Am. 1. tab. 5. 

 R. chrysomela. f \Iu\ Am. 2, p. 143. 



Shining Rudbeckia. 



Root perennial. Stem about 2 feet high, rather slender, terete, striate, rough 

 and hairy, virgately branched, or sometimes simple. Leaves 1 or 2 to 4 inches Ion? 

 and half an inch loan inch wide, alternate, mostly oblong-lanceolate, acute (some- 

 times inclining to spatulate), sparingly denticulate, hairy and scabrous on both 

 aides, narrowed at base, sessile and subamplexicaul, or slightly cordate at the 

 insertion. Heails of flowers rather small, solitary and terminal on the lone nearly 

 leafless peduncle-like branches; involucre foliaccous, hirsute, the leaflets lance- 

 oblong, outer ones largest ; rays orange-yellow, bifid ly emarginate at apex, hairy 

 beneath ; disk very dark purple, convex, or nearly hemispherical. Akeues Wan- 

 gled ; pappus a slight margin. Receptacle convex, chafly, the chuff spalulate- 

 linear, abruptly acute, smooth, the summit dark purple and ciliate on the margii:. 

 Ilab. Old fields, and borders of thickets: frequent. Fl. Aug. Fr. Sept— Octo. 



2. R. hirta, L. Very hirsute ; stem virgatc, sparingly branched ; 

 leaves ovate-lanceolate, subserrate, hirsute, the lower ones spatulate- 

 lanceolate ; disk conical, jbeck, Hot. p. 204. 



Rough-haired Rudbeckia* 



