FLOWERING PLANTS AND FERNS OF ARIZONA 811 



and mesas, nowhere abundant, March to May. type from Hackbeny, 

 Mohave County {Jones in 1903). Known only from central Arizona. 

 This is the Arizona counterpart of the well-known scarlet-bugler 

 (P. centranthifolius Bentli.) of coastal California. It has the most 

 slender corolla tube of all scarlet penstemons excepting the very 

 distinct and shrubby P. pinifolius. 



8. Penstemon utahensis Eastw., Zoe 4: 124. 1893. 



Navajo, Coconino, and Mohave Counties, 4,000 to 6,500 feet. 

 uncommon, canyons and mesas, March to May. Southern Utah and 

 northern Arizona to eastern California. 



9. Penstemon parryi A. Gray, Syn. Fl. 2 ! : 264. 1878. 



Penstemon puniceus A. Gray var. parryi A. Gray in Torr., 



U. S. and Mex. Bound. Bot. 113. 1859. 



Penstemon shantzii A. Nels., Amer. Jour. Bot. 23: 270. 1936. 



Penstemon shantzii var. incognitus A. Nels., ibid. 25: 116. 1938 > 



Pinal, Cochise, Santa Cruz, and Pima Counties, 1,500 to 5,000 feet, 

 mountain canyons and well-drained slopes, spring, type from the 

 Gila River (Parry in 1852). Southern Arizona and Sonora. 



In favorable situations and seasons this plant produces from the 

 base many erect steins up to 4 feet in length, bearing very showy 

 flowers. The species is not uncommon, but the individuals are usually 

 well scattered. 



10. Penstemon superbus A. Nels., Biol. Soc. Wash. Proc. 17: 100. 



1904. 



Penstemon puniceus A. Grav in Torr., U. S. and Mex. Bound. 

 Bot. 113. 1859. Not Lilja, 1843. ' 



Greenlee, Graham, and Cochise Counties, 4,000 to 5,200 feet, 

 uncommon, rocky canyons and along washes, sandy or gravelly soils, 

 April to May. New Mexico, southeastern Arizona, and Chihuahua. 



In habit very similar to P. parryi, with which it apparently inter- 

 grades. 



11. Penstemon whippleanus A. Gray, Amer. Acad. Arts and Sci. 



Proc. 6: 73. 1862. 



Penstemon arizonicus Heller, Torrey Bot. Club Bui. 26: 591. 



1899. 

 Penstemon stenosepalus (A. Grav) Howell, Fl. Northw. Amer. 



1: 514. 1901. 

 Penstemon metcaljei Woot. and Standi., Torreya 9: 145. 1909. 



San Francisco Peaks (Coconino County), 10,400 to 11,500 feet. 

 July and August, type of P. arizonicus from the crater of the San 

 Francisco Peaks {MacDougal in 1898). Idaho to New Mexico and 

 northern Arizona. 



The flower color of Arizona specimens is of the purple phase rather 

 than lemon yellow or whitish, as it is occasionally elsewhere within 

 the range of the species. 



