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 Cafion, Las Animas Co.; 

 Trinidad. 



5. Convolvulus americanus (Sims) Greene. (C. sepium 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 113. 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. MiCROSTERIS. 



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. GiLIA. 



Stem without proper leaves, but with persistent connate cotyledons ; 

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



5. Gymnosteeis. 

 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, densefy arachnoid-lanate, mucronate-tipped, but 



scarcely acerose. i. P. bryoides. 



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. 



