680 



POLEMONIACE.\E 



Stem without proper leaves, but with persistent connate cotyle- 

 dons and connat-e bracts subtending the head-like flower - 

 clusters. 11. Gtmxosteris. 



CoroUa 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. LiNAXTHUS. 



Leaves alternate ; coroUa very small, campanulate. 



12. TrXTrN-.\BULT7M. 



Corolla rotate. 13. Giix\strcm. 



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



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

 Flowers perfect, soUtary- or clustered. Cal\-x wholly fohaceotLs, 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 man)- (rarely 1 or 2) in each cell. Seeds re- 

 maining unchanged when wetted. 



Anruals: corolla almost rotate, shorter than the calyx. I. Micran'THA. 



Perennials; corolla longer than the calj-x. 



CoroUa 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. Pi:lchell.\. 

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



III. C-VERULE-^. 



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

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



lY. VlSCOSA. 



I. MlCR-tNTHA. 



One species. 1. P. micranthum. 



II. PrLCHELL.\. 



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. 



Inflorescence and leaflets scarcely crowded; sepals acutish. 

 Stem-leaves 1-3; inflorescence open. 

 Stem-leaves 3—5; inflorescence narrow. 



III. C.AERULE.\. 



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

 CoroUa straw-colored or white. 

 CoroUa purple. 



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

 CoroUa 8-15 mm. high; leaves pubescent. 



Stem and inflorescence long-viUous, scarcely at aU viscid. 



9. P. moUc. 

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



CoroUa over 12 mm. long; inflorescence conical or ovoid in outline: main 



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



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

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



Upper leaflets not confluent; plant with a creeping rootstock. 



Flowers in a narrow tuyrsiis; leaflets iisuaUy 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 verticiUate. 14. P. speciosum. 



Leaflets more or less verticUlate. 



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

 Calj-x denselj- viscid, but not conspicuously long-hairy. 



15. P. riscosum. 

 Calyx conspicuously villous with long white viscid hairs. 



16. P. Grayanum. 

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



