SNAPDRAGON FAMILY 135 



( 1 Leaves linear thread-like, densely tufted 



at base ; flowers purple or white P. laricifolius 



(2) Leaves lance-linear to ovate or rounded 



(a) Stems single or few, erect, 6-24 in. high 

 x. Corolla narrow, 1-2 cm. long 



(x) Flower verticillate in 1 to several 

 head-like clusters, making an in- 

 terrupted spike, yellowish to 

 blue; sepals usually white-mar- 

 gined and toothed P. confertus 



(y) Flowers not in a head-like cluster; 

 sepals mostly entire and not 

 white-margined ; blue P. gracilis 



y. Corolla widened into a throat, 2-4 cm. 



long P. Hdrbouri 



(b) Stems many, clustered, spreading, mostly 



2-6 ft. high, from a spreading rootstock 

 x. Anthers long-hairy 



(x) Corolla swollen above, 2.5-4 cm. 



long ; stems glaucous P. strictus 



(y) Corolla scarcely enlarged, 1.5-2 cm. 



long; stems finely hairy P. Fremontii 



y. Anthers smooth or sparsely short-hairy 

 (x) Sterile stamen smooth; corolla 2.5- 



4 cm. long P. gldber 



(y) Sterile stamen bearded 

 m. Stems sticky-hairy above, at least 

 the pedicels and calyx 

 (m) Stems smooth; pedicel and 

 calyx sticky-hairy ; flowers 

 wine-colored to nearly black, 

 sometimes pale P. glaucus 



u) Stems hairy or glandular 

 r. Sterile filament densely beard- 

 ed ; corolla rose to purple, 2- 

 3 cm. long P. cr is tat us 



s. Sterile filament sparsely short- 

 bearded ; corolla white 1.5-2 

 cm. long P. dlbidus 



n. Stems not sticky-hairy 



(m) Upper leaves and flower 



