430 ^ DESCRIPTIONS OF NEW SPECIES 



Pyrrhopappus grandijlorus. Borhhausia grandiflora, Nutt. in Journ. Acad. 

 Nat. Sci. Philad., Vol. VII., p. 69. Pyrrhopappus scaposus, Decand. Prod., 

 Vol. VII., p. 144. The achenium, seen in a young state, exhibits a short ros- 

 trum. 



Hab. In the plains of Arkansa, (Dr. Pitcher;) also in Mexico, (Berlandier.) 



Pyrfhopappus Carolinianus. ^. *maximus; smooth, leaves for the most part 

 laciniately pinnatifid, acuminate; capitulum very many-flovs^ered. 



Hab. In Arkansa. Two to three feet high ; the root apparently perennial ; the lower leaves a 

 foot long, with divaricate, linear segments. Stipe of the achenium about twice its length. The 

 pappus decidedly simple, not in the least scabrous, seen through an ordinary microscope. Sepals with 

 a lateral, obtuse tooth at the summit, as in the original species. Branches of the stigma short, 

 rather obtuse, and pubescent. 



TARAXACUM. (Haller.) 



Taraxacum * montanum; very smooth; leaves spathulate-oblong, nearly en- 

 tire or runcinately toothed; scape smooth, much longer than the leaves; cali- 

 culum biserial, short and appressed, the scales ovate, or lanceolate, vs^ith broad 

 membranaceous margins; sepals not corniculate, about twelve; achenium spi- 

 nosely muriculate at the summit, scarcely half the length of the rostrum. 



Hab. On the banks of the Platte, in subsaline situations towards the Rocky Mountains, and in 

 the highest valleys of the Colorado of the West. Allied very nearly to T. obovatum and T. colli- 

 num. Perennial. Leaves three or four inches long, half to three-quarters of an inch wide, erect: 

 never pinnatifid, mostly obtuse, the teeth shallow and simple. Base of the stem, in a young 

 state, somewhat pubescent, in the axiUs only. Scape six to ten inches high, perfectly smooth- 

 Flowers rather small. 



MACRORHYNCHUS. (Lessing.) 



Obs. The genus ought probably to be confined to the species with an alated, 

 winged achenium. 



Subgenus *KYMAPLEURA.t Achenia compressed, deeply alated, ten-rihbed, the 

 wings undulated; the exte?'ior series hirsutely pubescent, the interior smooth, 

 with narrow ribs. 



Macrorhynchus *heterophyllus; Q, more or less hirsute; primary leaves spa- 

 thulate, the rest pinnatifid, with remote linear segments, the central lobe elon- 



t From xvf^a, a wave, and rtXivpa, a rib, the achenium having undulated ribs. 



