218 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Cichoriacece that we cannot let go those founded on the nature of the 

 pappus. It seems necessary, however undesirable, to admit a third 

 genus of the sort, founded on a single species, viz. : — 



Ch^tadelpha. — Capitulum 5-florum, liguliflorum. Involucrum 

 cylindricum, e squamis 5 lauceolato-linearibus membranaceis dorso 

 inferne carinatis achenia foventibus, cum exterioribus nonnullis caly- 

 culum referentibus. Receptaculum nudum. Ligulaj breves ut videtur 

 rosefe. Achenia linearia, utrinque truncata, sub-5-angulata, leviter 

 pauci-striata, apice lato subrepando. Pappus persistens, sordescens, 

 vientadelphus, nempe e paleolis 5 aristiformibus rigidis nudis, cum setis 

 rigidis utrinque 3-5 pi. m. brevioribus basi accretis. — Herba perennis, 

 facie Eulygodesmice. 



C. Wheeleri. Southern Nevada, on the borders of Arizona, 

 Lieut. G. M. Wheeler, U.S.A. — An incomplete character of this was 

 published by S. "Watson in the American Naturalist, May, 1873, among 

 other novelties of the region. 



