FLOWERING PLANTS AND FERNS OF ARIZONA 817 



35. Penstemon virgatus A. Gray in Torr., U. S. and Mex. Bound. 

 Bot. 113. 1859. 



Penstemon putus A. Nels., Wyo. Univ. Pubs. Bot. 1: 131. 

 1926. 



Navajo, Coconino, Yavapai, Graham, and Gila Counties, 5,000 to 

 11,000 feet, pine woodlands and mountain meadows, summer. New 

 Mexico and Arizona. 



The corolla is marked with deep-purple guide lines within the 

 throat and is usually pale violet; but throughout the range of the 

 species occasional plants are found with white flowers. This color 

 variation was the basis of P. putus, type from Black River, White 

 Mountains (Goodding 1100). P. virgatus is a highly variable species 

 as to leaf width, shape of the calyx lobes, presence or absence of 

 puberulence, and size of the corolla, but only one geographic variant 

 is significant, namely, P. virgatus subsp. arizonicus (A. Gray) 

 Keck (P. hallii var. arizonicus A. Gray). This form occurs in the 

 White and Pinaleno Mountains, 9,000 to 10,000 feet, and differs 

 from the species in having the staminode bearded, the leaves some- 

 what broader and oblong-spatulate instead of merely linear-lanceolate, 

 and the calyx lobes broadly scarious-margined and erose. Inter- 

 grades occur between this form and the species. 



*36. Penstemon laevis Pennell, Contrib. U. S. Natl. Herbarium 20: 

 347. 1920. 



Not rare just over the State line in Utah, e. g., in Kanab Canyon, 

 and likely to be found in Coconino and Mohave Counties, May and 

 June. 



This species has blue-purple flowers marked with guide lines as 

 in P. virgatus, but its thyrsus is somewhat broader and more compact. 



Penstemon leiophyllus Pennell, very closely related to P. laevis but distinguished 

 by a finely glandular-puberulent inflorescence and a usually glabrous staminode, 

 may also be expected in Mohave and Coconino Counties, having been found in 

 Utah within 10 miles of the Arizona State line. 



37. Penstemon comarrhenus A. Grav, Amer. Acad. Arts and Sci. 



Proc. 12: 81. 1876. 

 Betatakin Canyon, Navajo County (Wetherill 412), Laguna Canyon, 

 Painted Desert (Clute in 1920), apparently very rare. Western 

 Colorado, Utah, and northeastern Arizona. 



38. Penstemon strictus Benth. in DC, Prodr. 10: 324. 1846. 

 Lukachukai Mountains, Skeleton Mesa, Segi Canyon, north of 



Marsh Pass (Apache and Navajo Counties), about 8,000 feet, un- 

 common, June and July. Southern^ Wyoming to northern New Mexi- 

 co, northeastern Arizona, and Utah. 



The Arizona specimens are slightly puberulent, instead of glabrous, 

 at the very base of the stem and so may be referable to subsp. angustus 

 Pennell. From the Coconino National Forest north of Flagstaff 

 came a single collection (Stone 363) of subsp. strict i [form is (Rydb.) 

 Keck (P. sfrictifonnis Rydb.), a form otherwise limited to south- 

 western Colorado, characterized by lanceolate scarious-margined 

 sepals up to 10 mm. long, and broadly lanceolate upper cauline leaves. 



