PHLOX FAMILY 691 



Plant 1-2 dm. high, cespitose. 



Leaves filiform, 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, pmnatifld. 



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-like, more or less interrupted; corolla greenish white, 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 22.5 mm. long. 7. G. congesta. 



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



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 



pinnatifid. 

 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. 



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

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



II. PUMILAE. 



Leaves entire or merely toothed. 



Leaves linear-filiform, entire. 14. G. Gunnisonii. 



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



Leaves pinnatifid. 



Divisions of the leaves linear-filiform; 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 slightly exceeding the calyx. 17. G. polycladon. 



III. CAPITATAE. 

 One species. 18. G. capitata. 



IV. AGGREGATAE. 

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



Calyx only slightly 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. 



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. 



VI. PINNATIFID AE. 



Divisions of the leaves all linear-filiform, not wider than the rachis; corolla about 1 cm. 



long. 27. G. polyantha. 



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



Corolla-tube 4-6 mm. long; calyx-lobes acuminate. 28. G. calcarea. 



Corolla-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-third to two-thirds as long as the corolla. 



