274 CONVOLVULACEAE. 



3. Convolvulus hermannioides A. Gray. Dry plains and in sandy soil from 

 Neb. and Colo, to Tex. Trinidad. 



4. Convolvulus incanus Vahl. On dry plains from Colo, to Tex. and Ariz. ; 

 also Mex. Alt. 4000-5500 ft. Canon City; Brantly Canon, Las Animas Co.; 

 Trinidad. 



5. Convolvulus americanus (Sims) Greene. (C. septum americanus Sims) 

 Among bushes from N. S. and Wash, to N. C. and N. M. Alt. 4000-7000 

 ft. Walsenburg; Cucharas Valley near La Veta; Colorado Springs; Denver; 

 Ouray; Ft. Collins. 



6. Convolvulus interior House. In sandy soil from Neb. and Colo, to Ind. 

 Terr, and Ariz. Ft. Collins. 



Family 1 13. POLEMONIACEAE Vent. PHLOX FAMILY. 



Calyx at length ruptured by the maturing capsule. 



Calyx-tube more or less scarious between the lobes distended and then ruptured 



by the capsule. 

 Corolla strictly salver-shaped with a narrow throat ; leaves proper opposite ; 



seeds without spiracles. 

 Seeds not altered when wetted ; our species all perennials with all the 



leaves opposite. i. PHLOX. 



Seeds mucilaginous when wetted ; annuals with floral leaves alternate. 



2. MlCROSTERIS. 



Corolla funnelform or tubular with an open funnelform throat ; seeds muci- 

 laginous when wetted. 

 Stem leafy ; bracts not connate. 



Leaves opposite ; inflorescence cymose and dichotomously branched ; 



seeds without spiracles. 3. LINANTHUS. 



Leaves alternate ; inflorescence paniculate or capitate ; seeds usually 

 producing spiracles (spirally twisted threads) when wetted. 



4. GlLIA. 



Stem without proper leaves, but with persistent connate cotyledons ; 

 bracts of the capitate inflorescence leaf-like and connate at the base. 



5. GYMNOSTERIS. 

 Calyx-tube not at all scarious, early splitting without being distended ; lobes 



and leaves more or less spinulose-pointed ; seeds without both spiracles and 



mucilage. 6. LEPTODACTYLON. 



Calyx not ruptured by the capsule ; leaves alternate ; seeds with mucilage and 



spiracles when wetted. 

 Calyx-teeth spinulose-tipped ; leaves pinnatifid ; flowers capitate. 



7. NAVARRETIA. 

 Calyx-teeth herbaceous, not spinulose-tipped. 



Stamens straight ; leaves simple, in ours entire. 8. COLLOMIA. 



Stamens declined; leaves pinnate. 9. POLEMONIUM. 



i. PHLOX L. PHLOX. 



Intercostal portion of the calyx not replicate. 



Leaves beset with cob-webby hairs ; plants densely pulvinate-cespitose. 



Leaves ovate to lanceolate, densely arachnoid-lanate, mucronate-tipped, but 



scarcely acerose. i. P. bry aides. 



Leaves subulate, acerose, sparsely arachnoid. 2. P. canescens. 



Leaves not cob-webby, except sometimes slightly so at the base. 



Leaves glabrous, or merely cob-webby at the base, not glandulose. 

 Calyx over 8 mm. long ; its teeth longer than the tube. 

 Calyx and the bases of the leaves arachnoid-hairy. 



3. P. andicola. 

 Calyx and stem finely villous or glabrous ; leaves not arachnoid. 



