280 POLEMONIACEAE. 



9. POLEMONIUM L. Jacob's Ladder. 



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. 

 Stem and leaves viscid-pubescent with long flat hairs. 



Calyx-lobes broadly lanceolate ; pedicels in anthesis shorter than the flowers. 



1. P. scopulinum. 

 Calyx-lobes narrowly lanceolate ; pedicels in anthesis usually equalling or 

 exceeding the flowers. 2. P. delicatum. 



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



3. P. parviAorum. 

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

 Inflorescence narrow, dense, thyrsoid. 



Plants with a slender rootstock, not long-villous. 4. P. occidentale. 



Plants with a woody base ; stem and leaves long-villous. 



9. P. foliosissimum. 

 Inflorescence open and broad. 



Corolla 2 cm. high or nearly so ; leaves glabrous. 5. P. grande. 



Corolla 8-1 5 mm. high; leaves pubescent. 



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



6. P. molle. 

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

 Corolla over i cm. long ; inflorescence conical or obovoid in outline ; 

 main peduncle usually exceeding the branches. 

 Sepals oblong-lanceolate ; flowers few. 7. P. Archebaldiae. 



Sepals lanceolate ; flowers numerous. 8. P. robustum. 



Corolla less than i cm. long ; inflorescence flat-topped ; main peduncle 

 exceeded in length by the branches. 9. P. foliosissimum. 



Corolla funnelform ; filaments without appendages at the base ; inflorescence 

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

 Corolla purple. 



Leaflets not verticillate. 10. P. speciosum. 



Leaflets more or less verticillate. 



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



tube. II. i'. Grayianum. 



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



12. P. confertum. 

 Corolla yellow, ochroleucous or greenish. 



Corolla funnelform ; stamens adnate to the middle of the corolla-tube. 



13. P. mellitum. 

 Corolla almost tubular ; stamens almost wholly adnate to the corolla-tube. 



14. P. Brandegei. 



1. Polemonium scopulinum Greene. {P. humile pulchellum A. Gray, in 

 part) On mountain sides of Colo. — Alt. 8000-14,000 ft. — Lake City; head- 

 waters of Clear Creek; Mt. Hesperus; Iron Mountain; Tennessee Pass, Lake 

 Co. ; Seven Lakes ; Cameron Pass ; Georgetown ; Gray's Peak ; Silverton ; 

 Mt. Abram, Ouray; Alpine Tunnel; Pike's Peak; Bob Creek; Mt. Baldy; 

 Bottomless Pit; Cottonwood Lake; Red Mountain road, south of Ouray; 

 Carson ; near Pagosa Peak ; near Ironton, San Juan Co. ; Silver Plume ; 

 Grand Mesa, Gunnison watershed; above Graymont; Beaver Creek; Empire; 

 Buffalo Pass ; Eldora to Baltimore ; mountains between Sunshine and Ward. 



2. Polemonium delicatum Rydb. On high mountains in Colo, and N. M. 

 — Alt. 10,000-12,000 ft. — Marshall Pass (?); West Spanish Peak; Silver 

 Plume; Bob Creek; Berthoud Pass. 



3. Polemonium parviflorum Nutt. (P. viscosum A. Gray, in part; not 

 Nutt.) On hills from Mont, and Wash, to Colo, and Calif.— " Colorado." 



