424 DESCRIPTIONS OF NEW SPECIES 



Suborder III. LIGULIFLOR^. 



Tribe VIII. CICHORACEjE. (Vaill. Jussieu.) 



Subtribe iii. Hyoseride^. (Lessing, Decand.) 



APOGON. (Elliott.) Serinia? (Rafin.) 



Obs. Involucrum generally eight-leaved, connivent in the fruit. Liguli 

 about the length of the involucrum. 



Apogon lyratum, (Nutt.;) smooth and glaucous; cauline leaves dilated at the 

 base, the lower and radical ones runcinate lyrate; pedicels two or three; pap- 

 pus none; achenium smooth. — Serinia cespitosa? Rafinesque, Flor. Lud., p. 

 149. Probably a dwarf state, as it is not cespitose. 



Hab. The plains of Arkansa. Very nearly allied to A. humilis, from which it principally differs 

 in its lower lyrate leaves; segments about two pairs, upper leaves elongated linear-lanceolate, the 

 floral pair opposite. Involucrum eight-leaved. In Jl. humilis, the summit of the pedicel, and base 

 of the involucrum is often pubescent. 



*UROPAPPUS. 



(Section Calocalais of Calais, Decand. in part.) 



Capitulum many-flowered. Involucrum ovate, loosely imbricate; sepals sub- 

 lanceolate in two or three series, the outer shorter. Receptacle naked, flat. 

 Florets about equal with the involucrum. Achenium subcylindric, minutely 

 scabrous or muricate, striate, attenuated into a thick rostrum. Pappus of 

 five linear-lanceolate, one-nerved paleae, cleft at the summit, with a slender, 

 somewhat scabrous awn issuing from the cleft. — Smooth and rather slender 

 annuals of Upper California, with long, linear, attenuated leaves, entire or 

 pinnatifidly laciniate. Pedicels very long, scapiform, one-flowered. Flow- 

 ers yellow. — (The name alludes to the singular setaceously caudate pappus.) 



