680 POLEMONIACEAE 



Stem without proper leaves, but with persistent connate cotyle- 

 dons and connate bracts subtending the head-like flower- 

 clusters. 11. Gymnostekis. 

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



open. 



Corolla campanulate or short- funnelform. 



Leaves mostly opposite; flowers medium sized; corolla fxmnelform. 



10. LlNANXnUS. 



Leaves alternate ; corolla very small, campanulate. 



12. TlNTINABTJLUM. 



Corolla rotate. 13. Giuastrum. 



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



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

 Flowers perfect, solitar}^ or clustered. Calyx wholly foliaceous, 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. 

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

 maining unchanged when wetted. 



Annuals; corolla almost rotate, shorter than the calyx. I. Mick.\ntha. 



Perennials; corofla longer than the calyx. 



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



usually open ; leaflets never verticillate. 

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



II. PULCHELLA. 



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



III. Caerttlea. 



Corolla funnelform. to trumpet-shapod ; filaments without appendages at the base; 

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



IV. ViSCOSA. 



I. MlCRANTHA. 



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. parvifolium. 



Inflorescence and leaflets scarcely crowded; sepals acutish. 



Stem-leaves 1-3; inflorescence open. 5. P. pulcherrimuni. 



Stem-leaves 3-5; inflorescence narrow. 6. P. Haydeni, 



III. CAERULE.1. 



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



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



Corolla pixrple. 



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



Corolla 8-15 mm. high; leaves pubescent. 



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



9. P. moiic. 



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

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



peduncle usually exceeding the branches. 10. P. robustum. 



Coroila less than 12 mm. long; inflorescence flat-topped; main peduncle 

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



Upper leaflets not confluent; plant with a creeping rootstock. 



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



12. P. occidentale. 



Flowers in an open cor^-mbiform or paniculate inflorescence; leaflets 3-5 cm. long. 



13. P. intermedium. 



^ „ IV. ViSCOSA. 



Corolla purple. 



Leaflets not verticiflate. 14. P. speciosum. 



Leaflets more or less verticillate. 



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

 Calyx densely viscid, but not conspicuously long-hairy. 



15. P. viscosum. 



Calyx conspicuously villous with long white viscid hairs. 



16. P. Grayanum. 



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



