PHLOX FAMILY 



691 



Plant 1-2 dm. high, cespltose. 



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



2. G. spergulifolia. 

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



3. G. crebrifolia. 

 Leaves, at least some of them, pinnatifld. 



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

 head-hke or spike-Uke inflorescence. 

 Stamens inserted in the throat of the corolla. 



Inflorescence spike-like, more or less interrupted; corolla greenish white, its 



lobes acute. 4. G. spicata. 



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

 CoroUa-lobes 3—4 mm. long. 



CoroUa-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 coroUa-tube. 8. G. tridactyla. 



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

 less cor>-mbosely arranged. 

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



Leaves and inflorescence crisp-hairy. 



Corolla-lobes about 2 mm. long; calj-x-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 hnear, 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. iberidifolia. 

 CoroUa-lobes 4-5 mm. long ; calj-x-teeth and bract rose-tinsed, with long spine- 

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



II. PUMIL.^£. 



Leaves entire or merely toothed. 

 Leaves linear-flliform, entire. 

 Leaves oblanceolate, some of them toothed. 

 Leaves pinnatifld. 



Divisions of the leaves hn ear-filiform; floral leaves similar; corolla twice as long as 



the calyx. 16. G. pumila. 



Di\-isions of the leaves verj- short, oblong; floral leaves broader and shorter, more 

 entire; tube of the coroUa shghtly exceeding the calyx. 17. G. polycladon. 



14. G. Gunnisonii. 



15. G. depressa. 



One species. 



III. Capitatae. 

 IV. Aggregat.\e. 



18. G. capitata. 



CoroUa-lobes acute or acuminate; coroUa usuaUj- scarlet or pink. 



Calj'x only shghtly scarious at the angles; its lobes lanceolate-attenuate, longer than 

 the tube. 

 Calj-x and inflorescence glandular-puberulent, not long-hairy. 

 Stamens included. 



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



19. G. arironica. 

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



20. G. tenuituba. 

 Stamens exserted; coroUa-lobes attenuate. 21. G. aggregata. 



Calyx and usuaUy also the inflorescence with long white flat hair;?, as *eU as 

 glandular-puberulent. 22. G. pulchella. 



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



23. G. scariosa. 

 CoroUa-lobes roimded or obtuse at the apex; corolla white. 24. G. Candida. 



V. LOXGIFLOR-iE. 



CoroUa-tube 3—4 cm. long; its lobes obtuse. 

 CoroUa-tube 1.5-2.5 cm. long; its lobes acute. 



25. G. longiflora. 



26. G. laxiflora. 



TI. PlXXATIFIDAE. 



Divisions of the leaves aU Unear-filiform, not wider than the rachis; coroUa about 1 cm. 



long. 27. G. polyantha. 



Divisions, at least of the lower leaves, obovate or oblong, much broader than the rachis. 



CoroUa-tube 4—6 mm. long; calj'x-lobes acuminate. 28. G. calcarea. 



CoroUa-tube 8-10 mm. long; calyx-lobes acute. 29. G. MacVickerae. 



VII. IXCOXSPICUAE. 



CoroUa 7-14 mm. long. 



Calyx about one-fourth as long as the coroUa. 

 Calyx one-third to two-thirds as long as the corolla. 



30. G. scopulorum. 



