122 GAMOPETALOUS EXOGENS 



the florets, the scales imbricated and appressed. Receptacle naked. 

 Akenes clavate, ribbed. Pappus double, the inner of numerous 

 capillary bristles, the outer short and scale-like. Perennials : leaves 

 alternate ; flowers mostly bright purple. 



1. V. Noyeboracensis, Willd, Leaves oblong-lanceolate; 

 scales of the involucre mostly with a long filiform flexuose point. 

 V. praealta. mild. $ FL Cestr. ed. 2. p. 448. not of DC. 

 NEW-YORK VERNONIA. Iron-weed. 



Stem 2 or 3 to 6 or 7 feet high, sulcate-striate, roughish-pubescent, somewhat 

 branching above, finally hard and subJigneous. Leaves 3 to 6 or 8 inches long, 

 subsessile, serrate, roughish and subcoriaceous. Akenes scabrous with short hairs; 

 pappus dirty white, or sometimes purplish, scabrous. 

 Hob. Moist meadows; thickets, &c.: frequent. Fl. Aug. Fr. Sept. 



Ols. This is a worthless and rather troublesome weed, in low 

 meadow grounds. 



TRIBE 2. EUPATORIA V CEAE. 



Style-lranches obtuse or clavate, usually elongated, pubescent on the outside, 

 stigmatic lines below the middle of the branches; anthers not tailed at base. 



SUBTRIBE 1. EUPATORIE V AE. 



Heads discoid ; florets all alike, perfect and tubular, usually purple, or white, 

 almost never yellow ; receptacle naked. 



186. MA V TRIS, Schreb. 

 [A name of unknown derivation.] 



Heads mostly many-flowered, in long racemes, or spikes. Scales of 

 the involucre imbricated and appressed. Akenes slender, tapering 

 to the base, about 10-ribbed ; pappus of many plumose or scabrous 

 capillary bristles. Perennials : roots often tuberous ; stems usually 

 simple; leaves alternate, entire, mostly long and narrow; flowers 

 rose-purple. 



JOSi". Corolla smooth inside ; pappus merely scabrous, or barbellate. 



1. I. SCariosa, Willd. Leaves lanceolate, the radical ones ob- 

 long; heads subglobose; scales of the involucre spatulate, with 

 broad scarious margins. 



SCARIOUS LlATRIS. 



Stem, 1 or 2 to 5 feet high, rather stout, more or less pubescent. Leaves 3 to 6 

 inches long, the lower ones tapering to a petiole. Heads of flowers half an inch 

 to near an inch in diameter, in a terminal raceme or spike; scales of the involucre 

 with conspicuously scarious and often colored margins. Alcenes villous; pappus 

 subplumose. 

 Hob. Banks of streams : rare. Fl. Aug. Fr. Octo. 



Obs. This handsome species was detected near Buck Run, in this 

 County, in 1847, by Miss SARAH COATES, a lady of extraordinary 

 Botanical acumen, and attainments. 



3. L. spicskta,, Willd. Leaves sublinear: heads oblong; scales 

 of the involucre ovate and oblong, obtuse, with narrow scarious 

 margins. 



SPIKED LIATRIS. Button Snake-root. Blue Blazing Star. 

 Stem 2 to 4 or 5 feet high, striate, smoothish, very leafy. Leaves 3 or 4 to 6 or 8 



