PHLOX FAMILY 691 



Plant 1-2 diu. liigh, cespitose. 



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



T I ^ « i_ - . « 2. G. spcrgulifolia. 



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



Leaves, at least some of them, pumatifld, ' ' ^^^ ^ '**' 



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



head-like or spike-hke mflorescence. 

 Stamens inserted in the throat of the corolla. 



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



lobes acute. 4. o. spicala. 



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

 Corolla-lobes 3^ mm. long. 



Corolla-tube scarcelv exserted. 5. G. globularis 



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



Corofla-lobes 2-2. o mm. long. 7, G. congcma. 



Stamens mserted m the nuddle of the coroHa-tube. 8. G iridaclula 



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



less corymboseiy 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 hnear, not crowded, the leaves therefore distinctly 



pimiatifld. 



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



-^ , ,. 11. G. Burleyana, 



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



^ „ , , , 12. G. iberidifoUa. 



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

 tips; stem tinged with purple, 13. G. roseaia. 



II. PU5>nL.VE. 



Leaves entire or merely toothed. 



Leaves Unear-flliform. entire. 14. G. Gunnisoniu 



Leaves oblanceolate. some of them toothed. 15. G. depresaa. 



Leaves pinnatifid. 



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

 the calyx. 16. G. pumila. 



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

 entire; tube of the corolla sUghtly exceedmg the calyx. 17. G. polycladon, 



III. Capitatae. 

 One species. 18. G. capitata. 



IV. Aggregatae. 



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



Calyx only shghtly scarious at the angles; its 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. arironica. 

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



20. G. tenuituba. 

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



Calyx and usually also the inflorescence with long white flat hairs, as well as 



glandular-puberulent. 22. G. pulchella. 



CaljTc very scarious at the angles; its teeth shorter than thetube; corolla-lobes acute. 



23. G. scariosa. 

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



V. LONGIFLOIt\E, 



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. laxiftora, 



VI. PXXXATIFID.IE. 



Divisions of the leaves aU linear-flliform. 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 racMs. 



CoroUa-tube 4-6 mjn. long; cal>-x-lobes acuminate. 28. G. calcarea. 



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



VII. INCONSPICUAE. 



Corolla 7-14 mm. long. 



Calyx about one-fourth as long as the corolla. 30. G. scopulorum. 



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



