longer petioles, and deeper lobing of the leaf. These charac- 

 ters are very analogous to what are found in the Carduus 

 acaulis of our pastures, with the habit of which the P. uni- 

 jlorus is compared by its original describers. 



Descr. Boot fusiform, perennial. Stem none, or two to 

 four inches high. Leaves radical and cauline, obovate or 

 obovate-lanceolate, deeply and irregularly acutely sinuate- 

 toothed or subpinnafidly-lobed, with acutely toothed lobes ; 

 dark green and rugose above, with sunk veins, snow-white, 

 with appressed tomentum beneath. Flowering-stem or peduncle 

 stout, cylindric, densely tomentose. Involucre campanulate ; 

 surrounded by leaf-like, recurved, green bracts ; involucral 

 bracts linear-oblong, obtuse, or acute. Flower-heads two to three 

 and a half inches in diameter ; ray bright golden-yellow ; disk 

 orange ; ligules spreading, very numerous, in one series, one 

 to one and a half inches long, pilose beneath ; disk-flowers 

 with a slender tube, campanulate limb, and five narrow lobes. 

 Anthers with obscure tails. Style-arms slender, re volute. 

 Pappus-hairs very slender, rigid, reddish. — /. B. H. 



Fig. 1, Ray-flower; 2, disk-flower ; 3, stamen ; 4, style-arms; 5, pappus- 

 hair : — all magnified. 



