TJ2 CORRIGIOLACEAE. 



Leaves straight, ascending ; spinulcs of sepals less than i nnn. 



3. I', brcrispiiia. 

 Flowers more or less clustered ; leaves much longer than the bracts. 



Plant low and ditTuse, less than i dni. high ; calyx fully 3 mm. long. 



4. F. diffusa. 

 Plant taller, i dm. or more high; stem erect or ascending; calyx 2-2.5 nim. 



long. 

 Branches of the cymes ascending ; calyx about 2.5 mm. long : sepals lanceolate, 



gradually acuminate. 5. P. Jatitcsii. 



Branches of the cymes divarcate : calyx aliout 2 mm. long ; sepals oblong, 



abruptly acuminate. 6. P. IVardii. 



1. Paronychia pulvinata A. Gray. On exposed mountain tops from Wyo. 

 to Colo, and Utah. — Alt. 11,000-14,000 ft. — Cameron Pass; Mt. Garfield; 

 Gray's Peak ; Pike's Peak trail ; Massif de I'Arapahoe ; Berthoud Pass. 



2. Paronychia sessiliflora Nutt. On dry ridges from Sask. to Alb., Tex. 

 and Utah. — Alt. 5000-8000 ft. — Upper Larimer River. 



3. Paronychia brevispina (A. Nels.) Rydb. (P. scssiliHora brcvispina A. 

 Xcls.) On dry hills in Wyo. and Colo. — Waldon, North Park. 



4. Paronychia diffusa A. Nels. On dry plains and mountains from S. D. 

 to Wyo., Kans. and Colo. — Alt. 5000-13.000 ft. — Castle Rock, near Golden; 

 Gray's Peak ; Pike's Peak trail ; Table Rock. 



5. Paronychia Jamesii T. & G. On dry plains and mountains from Neb. 

 to Wyo., Tex. and N. M. ; also in Mex. — Alt. 4000-10,000 ft. — Ruxton Ridge; 

 Pike's Peak ; river flats east of Ft. Collins ; Horsetooth Mountain ; moun- 

 tains between Sunshine and Ward ; Boulder ; Larimer Co. ; Morrison ; 

 Meadow Park, Lj^ons ; Colorado City ; Spring Canon ; Ft. Collins ; Horse- 

 tooth Mountain. 



6. Paronychia Wardii Rydb. On dry plains from Neb. to Colo., Kans. and 

 Tex. — Alt. up to 7000 ft. — Colorado City; Cheyenne Mountain. 



Family 48. ALLIONIACEAE Reichenb. Four-o'clock Family. 



Bracts distinct. i. Abronia. 



Bracts united. 



Fruit neither strongly tubercled nor winged. 



Fruit not ribbed ; involucre herbaceous, little if at all enlarging in fruit, not 

 becoming membranous. 

 Stamens usually 5 ; involucres campanulate, not enlarged in fruit. 



2. QuAMOCLiniOX. 



Stamens 3 ; involucre rotate, somewhat enlarged in fruit in the manner of 

 the next genus, but not membranous. 3. Allioniella. 



Fruit ribbed ; involucre rotate, in fruit becoming much enlarged and mem- 

 branous. 4. Allioni.x. 

 Fruit with two rows of strong tubercles on the back and surrounded by two 

 toothed inflexed wings. 5- \Vedelia. 



I. ABRONIA Juss. 



Fruit narrowly winged or crested ; wings or crests not completely encircling the 

 fruit. 

 Fruit biturbinate, ;'. c, tapering at both ends, irregularly ridged or crested. 



I. A. fragrans. 

 Fruit turbinate or obpyramidal, i. e., almost truncate above, distinctly winged ; 

 the wings very broad above. 

 Bracts broadly ovate or obovate, acute or obtusish. 



