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. alyssifoHa. 



Plants densely pulvinate, less than 3 cm. high; leaves ovate-oblpng, less than 5 mm 



long, with very thick margins. 

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



densely glandulai- calyx. 18. P. albomarginata. 



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



19. P. diapensioides. 

 V. LONGIFOIJAE. 



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. linearifolia. 

 Plant usuzJIy 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 thick; only upper portion glandular; corolla 



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



Leaves obtusish or abruptly acute, thick and Arm; corolla-tube fully twice 

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



Leaves 1 nun. 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 base; 

 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; coroUa-tube longer than the calyx. 2. M. humilis. 



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

 the basal 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. W. diffusa. 



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



6. NAVARRETIA R. & P. 



Corolla white; pericarp hyaUne 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. N. 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. N. Breweri. 



7. LEPTODACTYLON Nutt. 



Leaves alternate; stem woody throughout. 



Plant pulvuiate-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 thick, 2-5 mm. long. 3. L. brevifolium. 



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



Leaves opposite ; stem woody only at the 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-vUlous (nearly glabrous in Gf nuda) ; flowers leafy-bracted. 

 Perennials; flowers in dense heads or spikes. I. Oongestae. 



Annuals, repeatedly branched, with small clusters of flowers in the axils of the 

 leaves, more capitate at the ends of the branches. II. Pumilae. 



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



III. Capitatae. 

 Flowers openly paniculate or thyrsoid-paniculate. 



