188 POLEMONIACE.\E 



Leaves pirmately divided. 



Corolla-tube over 1 cm. long; calyx-lobes lanceolate, attenuate and spine-tipped; 

 biennials. 

 Inflorescence thyrsoid, narrow. IV. Aggregatae. 



Inflorescence open and inclined to be flat-topped. V. Loxgiflorae. 



Corolla-tube less than 1 cm. long. 



Stamens conspicuously exserted; corolla nearly sal verform; biennials. 



VI. PlXXATIFIDAE. 



stamens not exserted, or barely so; corolla with a more or less funnelform 

 throat; annuals. VII. Inconspicuae. 



Leaves entire or the lower ones toothed or lobed. 



Leaves not filiform. VIII. Leptomeriae. 



Leaves or their divisions Aliform; annuals. IX. Mixutiflor.\e. 



I. COXGEST.\E. 



Leaves entire. 



Plant 3-4 dm. high, suffruticose. 1. G. frutescens. 



Plant 1-2 dm. high, cespitose. 



Leaves filiform, not very fleshy; flowering stems slender, sparingly leafy. 



2. G. sperg'ulifolia. 

 Leaves short, fleshy, falcate; flowering stems very short and very leafy. 



3. G. crebhfolia. 

 Leaves, at least some of them, pinnatifld. 



Plant branched only at the base, or simple; stem or branches strict, with a single 

 head-like or spike-like inflorescence. 

 Stamens inserted in the throat of the corolla. 



Inflorescence spike-Uke, more or less interrupted; corolla greenish wliite, its 



lobes acute. 4. G. spicata. 



Inflorescence head-like; corolla white, its lobes obtuse. 

 Corolla-lobes 3-4 mm. long. 



Corolla-tube scarcely exserted. 5. G. globularis. 



Corolla-tube decidedly exserted, about half longer than the calyx. 



6. G. cephaloidea. 

 Corolla-lobes 2-2.5 mm. long. 7. G. congesta. 



Stamens inserted in the middle of the corolla-tube. • 8. G. Iritiactyla. 



Plant branched above as well as at the base; inflorescence of several heads more or 

 less corymbosely arranged. 

 Leaves glabrous; inflorescence glandular. 9. G. nuda. 



Leaves and inflorescence crisp-hairy. 



Corolla-lobes about 2 mm. long; calyx- teeth and bracts green, with very short 

 spine-tips; branches straw-colored. 

 Segments of the leaves short, oblong, crowded, the leaves therefore appa- 

 rently subdigitate. 10. G. montana. 

 Segments of the leaves linear, not crowded, the leaves therefore distinctly 

 pinnatifld. 

 Branches erect, 1.5-3 dm. high; plant sparingly pubescent. 



11. G. Burleyana. 

 Branches ascending, 0.5-1.5 dm. high; plant densely pubescent. 



12. G. ibcridifolia. 

 Corolla-lobes 4-5 mm. long; calyx-teeth and bract rose-tinged, with long spine- 

 tips; stem tinged with purple. 13. G. roseala. 



II. PUMIL.VE. 



Leaves entire or merely toothed. 



Leaves hnear-fillform, entire. 14. G. Gunnisonii. 



Leaves oblanceolate, some of them toothed. 15. G. depressa. 

 Leaves pinnatifld. 



Divisions of the leaves linear-flliform ; floral leaves similar; corolla twice as long as 



the calyx. 16. G. piimila. 

 Divisions of the leaves very short, oblong; floral leaves broader and shorter, more 



entire; tube of the corolla slightly e.xceeding the calyx. 17. G. pulycladon. 



III. Capitatae. 

 One species. 18. G. capilata. 



IV. Aggreg.\.tae. 

 Corolla-lobes acute or acuminate; corolla usually scarlet or pink. 



Calyx only slightly scarious at the angles; it's lobes lanceolate-attenuate, longer than 

 the tube. 

 Calyx and inflorescence glandular-puberulent, not long-hairy. 

 Stamens included. 



Corolla-lobes ovate-lanceolate, acute; tube about 2 cm. long. 



19. G. arizonica. 

 Corolla-lobes narrowly lanceolate, attenuate; tube nearly 3 cm. long. 



20. G. tenuituba. 

 Stamens exserted; corolla-lobes attenuate. 21. G. aggrcgata. 



Calyx and usually also the inflorescence with long wliite flat hairs, as well a>s 

 glandular-puberulent. 22. G. pulchclla. 



Calyx very scarious at the angles; its teeth shorter than the tube; corolla-lobes acute. 



23. G. scariosa. 

 Corolla-lobes rounded or obtuse at the apex; corolla white. 24. G. Candida. 



V. Longiflorae. 



Corolla-tube 3-4 cm. long; its lobes obtuse. 25. G. longiflora. 



Corolla-tube 1.5-2.5 cm. long; its lobes acute. 26. G. laxiflora. 



