KEY TO THE SPECIES 65 



3. COLLOMIA 



Small annuals with entire narrow alternate leaves, tubular corolla, straight 

 stamens, and ovules solitary in each cell. 



1. CoUoinia linearis Nutt. (Narrow-leaved Collomia). Somewhat viscid- 

 pubescent, stems either slender simple and erect or at length much branched, 5-20 

 cm. or more high ; leaves linear-oblong or lanceolate ; corolla white or purplish, 

 the slender tube exceeding the calyx. 



4. POLEMONIUM 



Herbs with alternate pinnately compound leaves, spicate or cymose-paniculate 

 flowers, cylindraceous or campanulate calyx, funnel-form or campanulate corolla 

 and stamens inserted on the coroUartube. 



1. Folemonium mellitum (Gray) Aven Nelson (Honey-scented Polb- 

 MONIUM). Clanuny and viscid- pubescent, the herbage rank musk-scented, tufted, 

 1-2 dm. high ; leaflets numerous, smaU, crowded (as if verticillate) ; inflorescence 

 short-spicate ; corolla 2-3 cm. long, white, tubular funnel-form, its tube much 

 longer than the calyx and the corolla-Umb, honey-scented. Sides of rocky cliffs ; 

 middle elevations. 



2. Folemonium pulchellum Bunge (Pretty Polemonium). Finely pubes- 

 cent, especially above, 1-3 dm. high ; leaflets 15-81, oblong ; inflorescence cymose- 

 paniculate ; calyx cleft below the middle ; corolla campanulate-funnel-form, its 

 tube shorter than the calyx and the violet or bluish corolla-limb. Frequent in the 

 Colorado Mountains. 



LVI. HYDROPHYLLACEiE (Wateeleaf Family) 



Mostly hairy herbs with alternate leaves, 5-parted calyx, bell- 

 shaped sympetalous 5-lobed corolla, 5 stamens on the corolla- 

 tube, a 2-cleft style, and a superior 1-celled ovary becoming a 

 many-seeded pod. 



1. Hydrophyllum. Stamens and style conspicuously exserted ; corolla con- 

 volute in bud ; ovary bristly hairy; leaves large, green, and hirsute. 



3. Macrocalyx. Stamens shorter than the corolla ; calyx enlarging in fruit. 



3. Fhacelia. Stamens exserted ; corolla imbricated in bud ; leaves entire or 

 pinnatifid, whitish or sHvery pubescent (in the species here given). 



1. HYDROPHYLLUM (Waterleaf) 



Herbs with large petioled leaves, flattish clusters of white or pale-blue flowers, 

 mostly protruding stamens, and a 1-celled bristly-hairy ovary. 



1. Hydrophyllum occidentale Gray (Western Waterleaf), Hirsute- 

 pubescent, 2-5 dm. high ; leaves oblong-lanceolate in outline, pinnately parted into 

 7-15 divisions, the divisions toothed or incised ; cymes dense, capitate, on elongated 

 peduncles ; corolla campanulate, violet purple, varymg to white. 



