PHLOX FAMILY 187 



Leaves linear, 1-2 cm. long; margins not very thick; corolla-tube twice as long as 



the calyx; young stems white-angled. 16. P. Kelseyi. 



Leaves oblong with very thick margins, 7-12 mm. long; corolla-tube not twice as 



long as the calyx: young stems not white-angled. 17. P. alustsi folia. 



Plants densely pulviiiate, less than 3 cm. liigh; leaves ovate-oblong, less than 5 mm 



long, with very thick margins. 

 Flowers peduncled' corolla-tube over 1 cm. long, more than twice as long as the 



densely glandular calyx. IS. P. albomarginata. 



Flowers subsessile; corolla-tube less than 1 cm. long, not twice as long as the calyx 



19. P. diapensioides. 



V. LONGIFOLL\E. 



Plant glabrous or only the upper portion, peduncles, and calyces pubescent. 



Plant glabrous throughout, or rarely with a few scattered hairs on the calyces and 

 peduncles; calyx-teeth longer than the tube; leaves less than 2 mm. wide. 



20. P. linearifoHa. 

 Plant usually pubescent above, in one variety even glandular; calyx-teeth shorter 



than the tube; leaves over 2 mm. wide. 21. P. longifolia. 



Plant pubescent throughout. 



Plant densely grayish pubescent, not at all glandular, densely cespitose, with a thick 

 woody caudex. 22. P. austromontana. 



Plant glandular or viscid. 

 Corolla-tube glabrous. 

 Leaves 2-4 mm. wide. 



Leaves long-attenuate, not tbJck; only upper portion glandular; corolla 



scarcely twice as long as the calyx. 21. P. longifolia. 



Leaves obtusish or abruptly acute, tliick and firm; corolla-tube fully twice 

 as long as the calyx. 23. P. Stansburyi. 



Leaves 1 mm. wide; corolla not twice as long as the calyx. 



24. P. viridis. 

 Corolla-tube pubescent. 25. P. gladiformis. 



VI. Speciosae. 

 One species. 26. P. speciosa. 



4. MICROSTERIS Greene. 



Calyx-lobes much exceeding the tube in length; plant usually erect, simple below; corolla 



tube 1 mm. wide or more; Umb 3-4 mm. wide. 1. M. gracilis. 



Calyx-lobes not longer than the tube; plant low. diffusely branched from near the baser 

 corolla-tube less than 1 mm. wide; limb 1-2.5 mm. wide. 

 Plant 1.5-2 dm. high; leaves except the lower ones lanceolate or linear-lanceolate, 



mostly acute; corolla-tube longer than the calyx. 2. M. humilis. 



Plant less than 1 dm. high; leaves, except the basal ones, oblong or linear, obtuse, 

 the ba.sal ones spatulate; corolla-tube scarcely exceeding the calyx. 



3. M. micrantha. 



5. WELWITSCHIA Reichenb. 



Corolla-lobes much shorter than the tube. 



Plant erect: heads acute at the base; bracts ascending. 



Bracts not dilated at the base. 1. W. Wilcoxii. 



Bracts somewhat dilated at the base. 2. W. filifolia. 



Plant diffuse: heads rounded at the base; bracts spreading. 3. \V. diffusa. 



Corolla-lobes scarcely shorter than the tube. 4. W. floccosa. 



6. NAVARRETIA R. & P. 



Corolla wliite; pericarp hyaline and indehiscent or irregularly bursting, closely adherent 

 to the mucilaginous seeds. 

 Calyx and the bases of the floral leaves long-hairy; flowers nearly 1 cm. long. 



1. .V. intertexta. 

 Glabrate or strigose, long-hairy only in the sinuses of the calyx; flowers about 7 mm. 

 long. 2. N. minima. 



Corolla yellow; pericarp of the capsule firm, dehiscent. 3. y. Breweri. 



7. LEPTODACTYLON Nutt. 



Leaves alternate; stem woody throughout. 



Plant pulvinate-cespitose; corolla 4-merous. 1. L. caespitosum. 



Plant suffruticose, with erect branches; corolla 5-merous. 

 Leaves and their divisions ascending, straight. 



Leaves 6-15 mm. long. 2. L. pungens. 



Leaves tliick, 2-5 mm. long. 3. L. brevifolium. 



Leaves and their divisions spreading-recurved, stout. 4. L. patens. 



Leaves opposite; stem woody only at tlie base. 



Leaves decidedly pungent; ovules numerous. 5. L. Watsonii. 



Leaves scarcely pungent; ovules 2-3 in each cell. 6. L. Nuttallii. 



8. GILIA R. & P. 



Flowers capitately or spicately glomerate. 



Plant strigose or short-villous (nearly glabrous in G. nuda); flowers leafy-bracted. 

 Perennials; flowers in dense heads or spikes. I. COXGEST.^E. 



.\nnuals, repeatedly branched, with small clusters of flowers in the axils of the 

 leaves, more capitate at the ends of the branches. 11. PUMILAE. 



Plants glabroiLs; flowers in long-peduncled heads, not leafy-bracted. 



111. C.APITATAE. 



Flowers openly paniculate or thjTsoid-paniculate. 



