FLOWERING PLANTS AND FERNS OF ARIZONA 813 



spring and summer, type from near Chemehuevi, Mohave County 

 (Jones in 1903). Southwestern New Mexico to eastern California. 

 A common and beautiful species, separable into western and eastern 

 subspecies on the presence or absence of glands on the calyces 

 and pedicels. In Mohave, Yuma, and western Pima Counties, and 

 in California, is found subsp. typicus Keck, with the glands and 

 with glaucous herbage. To the eastward grows the much more 

 abundant, greener, and eglandular subsp'. connatifolius (A. Nels.) 

 Keck (P. connatifolius A. Nels., P. spectabilis Woot. and Standi., 

 not of Thurb.). The type of the latter subspecies was collected on 

 the Apache Trail, Gila or Maricopa County (A. Nelson 10314). A 

 beautiful form, apparently a first generation hybrid between subsp. 

 connatifolius and P. eatoni subsp. exsertus, collected near Superior 

 (A. Nelson 11262), has received the name P. crideri A. Nels. 



17. Penstemon bicolor (T. S. Brandeg.) Clokey and Keck, South. 



Calif. Acad. Sci. Bui. 38: 12. 1939. 



Penstemon palmeri var. bicolor T. S. Brandeg., Univ. Calif- 

 Pubs. Bot. 6: 360. 1916. 



Portland Mine to Chloride, Mohave County, 2,400 feet (Kearney 

 and Peebles 13163), spring, very rare. Southern Nevada and north- 

 western Arizona. 



The Arizona form is subsp. roseus Clokey and Keck. The typical 

 form of the species has essentially white flowers and has been found 

 only in Clark County, Nevada. The species as a whole, is found 

 associated with the creosotebush on outwash fans and plains. 



18. Penstemon nudiflorus A. Gray, Amer. Acad. Arts and Sci. Proc. 



20: 306. 1885. 

 Coconino, Mohave, and Yavapai Counties, mountainous regions 

 south of the Grand Canyon, 4,700 to 7,000 feet, dry slopes in yellow 

 pine forests, uncommon, summer, type from near Flagstaff (Lemmon 

 in 1884). Known only from north-central Arizona. 



19. Penstemon fendleri Torr. and Gray, U. S. Rpt. Expl. Miss. 



Pacif. 2 4 : 168. 1855. 

 Cochise County, 4,000 to 5,000 feet, not common, April to June. 

 Oklahoma and Texas to southeastern Arizona and Chihuahua. 



20. Penstemon pachyphyllus A. Gray ex Rydb., Fl. Rocky Mount. 



770, 1066. 1917. 



Coconino and Mohave Counties, from the Kaibab Plateau south to 

 Williams, 5,000 to 7,000 feet, dry slopes among yellow pine, pinyon, 

 or juniper, May and June. Utah, Nevada, and northern Arizona. 



The species is represented in Arizona by subsp. congestus (M. E. 

 Jones) Keck (P. congestus Pennell). Typical P. pachyphyllus, from 

 the Uintah Basin, northern Utah, differs from this subspecies in having 

 a very broad flaring corolla limb. In subsp. congestus there is variat ion 

 in the amount of pubescence on the orifice, in the color of the beard on 

 the staminode, and in the size of the calyx lobes. 



21. Penstemon angustifolius Nutt. ex Pursh, Fl. Amer. Sept. 738. 



1814. 

 Apache, Navajo, and Coconino Counties, 5,000 to 6,500 feet, mesas 

 and sandy grasslands, frequently on dunes, A [ay and June, North 



