196 PROCEEDINGS OF THE AMERICAN ACADEMY 



slightly incurved : cotyledons linear-oblong, nearly twice the length 

 of the radicle. 



■h- J— Paniculato-laxiflora?. Stamina 3 — 6. 



11. C. brevicornu, Torr. Bot. Mex. Bound, p. 177. Cinereo- 

 puberula, subspithamrea ; foliis plerisque radicalibus nunc linearibus 

 nunc obovato-spathulatis ; bracteis parvulis uncinato-mucronatis ; invo- 

 lucris angustis prismaticis secus ramos subsimplices panicute plerisque 

 dissitis, dentibus subasqualibus subulato-aristulatis recurvis tubo (lin. 

 2 — 3 longo vix semilineam lato) 3 - 5-plo breviore ; perigonii lobis 

 integerrimis ; starninibus 3. — S. E. California to the Gila and Ne- 

 vada, Fremont, Parry, Newberry, Watson, the latter from Truckee 

 Valley, near the desert, and different from other specimens in the 

 spatulate-obovate instead of almost linear leaves. No well-developed 

 or exserted flowers seen. 



12. C. COmmissuralis, Remy, Fl. Chil., the only annual species 

 not North American, is most related to G. brevicornu, is similar in 

 habit and inflorescence, and in the narrow involucre, but is more 

 downy. The flowers examined have six stamens, and are not quite 

 sessile in the involucre. Embryo straight; cotyledons narrow. 



* * * Perennes suffrutescentes, Chilenses, involucris corymboso- 

 glomeratis, dentibus herbaceis quandoque muticis. 



13. C. virgata, Benth., 14. C. pedunctjlaris, Benth., 15. C. 

 Macr^ei, Benth., 16. C. ramosissima, Benth., 17. C. paniculata, 

 Benth., 18. C. vaginata, Benth., 19. C. frankenioides, Remy, 

 20. C. glabresceks, Benth.; vide DC. Prodr. 14, p. 24. Of these 

 Chilian perennial species we have nothing to remark. Most of them 

 have a pretty long cylindraceous tube to the perigonium, on which the 

 stamens are borne either below the middle or near the base. 



§ 2. Mucronea. Involucrum 2 - 4-quetrum, 2 - 4-lobatum, char- 

 taceo-coriaceum, lobis herbaceis arista recta superatis. Stamina 

 9, basi perigonii 6-partiti inserta. Annua?, Californica?, nunquam 

 tomentosaa, divergenti-ramosissima?, involucris in dichotomiis et 

 secus ramulos graciles paniculatos sparsis, foliis in sicco perga- 

 maceis, caulinis bracteisque conformibus sursum sensim minori- 

 bus amplexicaulibus pi. m. stellato-trilobis, lobis cuspidatis vel 

 aristatis. Flos in involucro breviuscule seu longiuscule pedicel- 

 latus. 



