680 POLEMONIACEAE 



Stem without proper leaves, but with persistent connate cotyle- 

 dons and connate bracts subtending the head-like flower - 

 clusters. 11. Gymnosteris. 



Corolla rotate, or campanulate, with very short proper tube, and rather 

 open. 

 Corolla campanulate or short-funnelform. 



Leaves mostly opposite; flowers medium sized; corolla funnelform. 



10. LiNANTHUS. 



Leaves alternate; coroUa very small, campanulate. 



12. TlNTINABTJLUM. 



Corolla rotate. 13. Giliastbum. 



1. POLEMONIUM (Tourn.) L. Jacob's Ladder, Skunk-weed. 



"" More or less caulescent perennial or annual herbs, with pinnate leaves. 

 Flowers perfect, solitary or clustered. Calyx wholly foUaceous, campanulate, 

 more or less glandular, 5-cleft, not ruptured by the fruit. Corolla campanulate 

 or rotate-funnelform to almost tubular. Stamens 5; filaments adnate mostly to 

 the lower part of the corolla-tube, rarely unequally adnate to the upper part. 

 Style elongate. Ovules three to many (rarely 1 or 2) in each cell. Seeds re- 

 maining imchanged when wetted. 



Annuals; corolla almost rotate, shorter than the caly.x. I. Micrantr.\. 



Perennials; coroDa longer than the calyx. 



Corolla campanulate; filaments with pilose appendages at the base; inflorescence 

 usually open; leaflets never verticUlate. 

 Low, 1-3 dm. high, cespitose; basal leaves numerous and stem-leaves few. 



II. PULCHELIA. 



Stem tall, leafy, usually solitary from the rootstock, 4-10 dm. high. 



III. Caerulea. 

 Corolla fimnelform to trumpet-shaped; filaments without appendages at the base; 



inflorescence dense, spiciform; leaflets (except in the first species) verticillate. 



IV. ViSCOSA. 



I. MiCRANTHA. 



One species. 1- P- micranthum. 



II. PULCHELLA. 



stem and leaves viscid-pubescent, with long flat hairs; leaflets inclined to be ovate or 

 ovate-lanceolate. 

 Corolla over 1 cm. long; plants light green; leaflets 1.5-2 cm. long. 



2. P. columbianum. 

 Corolla less than 1 cm. long; plant dark green; leaflets 5-15 mm. long. 



3. P. delicatum. 

 Stem and leaves viscid-puberulent, the latter often glabrate. 



Inflorescence and leaflets crowded; sepals obtuse or rounded at the apex. 



4. P. parvifoHum. 

 Inflorescence and leaflets scarcely crowded ; sepals acutish. 



Stem-leaves 1-3; mflorescence open. 5. P. pulcherrimum. 



Stem-leaves 3-5; inflorescence narrow. 6. P. Haydcni. 



III. Caerulea. 



Upper leaflets decurrent and confluent; plants with a woody base. 



Corolla straw-colored or wliite. 7. P. albiflorum. 



Corolla pm-ple. „ ^ ^ ,-. ,j 



Corolla 2 cm. high, or nearly so; leaves glabrous. 8. P. Archioalaae. 



Corolla 8-15 mm. high; leaves pubescent. 



Stem and inflorescence long-villous, scarcely at all viscid. 



9. P. moUc. 

 Stem and inflorescence short-hairy; the latter at least distinctly viscid. 

 Corolla over 12 mm. long; inflorescence conical or ovoid in outline: mam 



pedimcle usually exceedmg the branches. 10. /'. robustum. 



Corolla less than 12 mm. long; inflorescence flat-topped; mam pedimcle 

 exceeded in length by the branches. 11. P. fohosissimum. 



Upper leaflets not confluent; plant with a creeping rootstock. 



Flowers in a narrow thyrsus ; leaflets usually less than 3 cm. long. 



12. P. occidentale. 

 Flowers in an open corymbiform or paniculate inflorescence; leaflets- 3-5 cm. long. 



13. P. intermedium. 



IV. ViSCOSA. 



Corolla purple. , . „ 



Leaflets not verticillate. 14. P. speciosum. 



Leaflets more or less verticillate. 



Corolla 2 cm. long or less, campanulate-fimnelform, with a rather broad tube. 

 Calyx densely viscid, but not conspicuously long-hairy. 



■15. P. viscosum. 

 Calyx conspicuously villous with long wliite viscid hairs. 



16. P. Grayanum. 



Corolla 2-3 cm. Idlig, funnelform, with a narrow tube. 17. P. confertum. 



