274 PROCEEDINGS OF THE AMERICAN ACADEMY 



4-6. — Benth. Kew Jour. 3, p. 290. G. spicata & G. trijida, Nutt. 

 ]. c. Rocky Mountains, Colorado, Nuttall, Fremont, Geyer, Parry, 

 Hall & Harbour. — Var. capitata : forma minor, foliis integerrimis, 

 floribus in eapitulo unico terminali. Rocky Mountains, Hall & Har- 

 bour, no. 461. 



39. G. congesta, Hook. Caulibus erectis vel diffusis (3-12- 

 poll.) e basi subeasspitosa ; eapitulis florum solitariis vel paucis eorym- 

 bosis densis ; foliis 3-7-partitis paucisve integerrimis, lobis ut calycis 

 aristulato-mucronatis ; corollas lobis ovalibus tubo suo baud exserto vix 

 brevioribus ; filamentis sinubus insertis antberas adasquantibus vel exce- 

 dcntibu^ ; ovulis in loculis 2-4. — Hook. Fl. &' Ic. t. 235. Colorado 

 and Nebraska, to Oregon and California in tbe Sierra Nevada. 



Var. crebrifolia. Depressa ; caulibus (2- 3-pollicaribus) foliosis- 

 simis monocephalis ; foliis aceroso-subulatis integris par.vis (lin. 3-6 

 longis). — G. crebrijolia, Nutt. PI. Gamb. I.e. — Rocky Mountains, on 

 Big Sandy River, Colorado, Nuttall. Specimens from Bear River 

 Valley, Utab, Watson, connect tbis with G. congesta. . 



40. G. iberidifolta, Benth. Kew Jour. 3, p. 290. Prascedenti 

 peraffinis ; foliis rigidioribus bracteisque cuspide validiore mucronatis ; 

 eapitulis corymbosis laxioribus; filamentis brevioribus ; ovulis in loculis 

 solitariis! — Scott's Bluffs, North Platte, Nebraska, Geyer; and Black- 

 water of the same, H. Engelmann. Not elsewhere met with. Per- 

 haps a form of G. congesta. 



* # * Folia omnia vel plera pinnatifida vel trifida : Mores conferte 

 cymulosi demum laxiusculi, folioso-bracteati : calycis lobi cum 

 bracteas aristulato-cuspidati. Annuas, humiles, e basi ramosae. 



41. G. gossypifera, Gillies, ex Benth. in Prodr., of the Andes of 

 Mendoza, is evidently of this section, and most like the following. 



.42. G. pumila, Nutt. PI. Gamb. (1849). Caulibus laxe lanosis 

 foliosis ; foliis angusto-linearibus integris vel in lobos 2-5 lineares 

 divergentes partitis ; corollas tubo (lin. 3-4 longo) gracili lobis suis 

 3 — 4-plo calycis lobis duplo longioribus ; filamentis gracilibus sinubus 

 insertis corollas lobis parum brevioribus ; ovulis in loculis 5-6. — G. 

 trijida, Benth. Kew Jour. 1. c. Western borders of Texas and New 

 Mexico, Fendler, Wright, Bigelow, &c, to the Platte, Nuttall, Geyer, 

 and Utah, S. Watson. 



43. G. polycladox, Ton*. Bot. Mex. Bound. Caulibus diffusis 

 subnudis parce pubescentibus vel puberulis ; foliis pinnatihdis incisisve, 

 lobis brevibus oblongis abrupte spinuloso-mucronatis, floralibus flores 



