FLOWERING PLANTS AND FERNS OF ARIZONA 809 



32. Corolla pink, salverform, 14 to 16 mm. long, the limb white 

 within, densely puberulent on all sides at the orifice, set 

 obliquely on the curved throat; stamens included. 



32. P. AMBIGUTTS. 



29. Plants strictly herbaceous; leaves not crowded or mucronate; corolla 

 large, funnelform, strongly bilabiate (33). 

 33. Inflorescence glandular-pubescent; leaves all linear-attenuate; 

 anther sacs obviously spinose-dentate along the suture; stami- 

 node glabrous (34). 

 34. Herbage cinereous throughout; inflorescence densely glandular- 

 pubescent, strict, racemose, the mostly 1 -flowered peduncles 

 erect; calyx lobes oblong or oblong-lanceolate, with entire, 

 narrowly or obsoletely scarious margins; flowering mainly in 

 spring 33. P. dasyphyllus. 



34. Herbage glabrate; inflorescence very lightly glandular-puberu- 



lent, open, paniculate, the commonly 2- or 3-flowered pe- 

 duncles divaricate; calyx lobes broadly ovate, with broad 

 erose scarious margins; flowering in late summer. 



34. P. STEXOPHYLLUS. 



33. Inflorescence not at all glandular; anther sacs microscopically 

 denticulate or glabrous along the suture (35) . 



35. Anther sacs glabrous or finely scabrid on the sides; inflorescence 



strict, secund (36). 



36. Sacs of the anthers opening throughout, straight, opposite; 



staminode glabrous (except in the subspecies); lower lip 



bearded; leaves mostly linear in the Arizona plaits (except 



in the subspecies) 35. P. virgatus. 



36. Sacs of the anthers opening partially, curved, divaricate; 



staminode bearded; lower lip glabrous; leaves lanceolate. 



36. P. LAEVIS. 

 35. Anther sacs villous on the sides (37). 



37. Corolla pale blue, the tube nearly as long as the throat; lower 



peduncles divergent, bearing elongate pedicels; anthers 



usually nearly hidden by hairs 37. P. comarrhexus. 



37. Corolla deep blue, the tube much shorter than the throat; 

 peduncles and pedicels appressed and short, the strict 

 panicle secund; anthers less densely villous. 



38. P. STRICTU3. 



1. Penstemon microphyllus A. Gray, U. S. Rpt. Expl. Miss. Pacif. 4: 



119. 1857. 



Penstemon plummerae Abrams, Torrey Bot. Club Bui. 33: 445. 

 1906. 



Gila and northern Pinal Counties to Mohave County, 1.800 to 5 000 

 feet, ciesert mountain ranges, often with junipers, April and May, 

 type from ^Yilliams River (Bigelow in 1853-4), type of P. plummerae 

 from Mineral Park, Mohave County (Lemmon in 1884). Southern 

 and western Arizona, southern California, and northern Baja Cali- 

 fornia. 



2. Penstemon pinifolius Greene, Bot. Gaz. 6: 218. 1881. 

 Known in Arizona only from the Clifton area (Greenlee County) 



and the Chirieahua and Swisshelm Mountains (Cochise County), 

 rocky summits above 5,000 feet, summer, type from near Clifton 

 (Greene in 1880). Southwestern New Mexico, southeastern Arizona, 

 and adjacent Mexico. 



3. Penstemon lanceolatus Benth., PI. Hartw. 22. 1839. 

 Mountains of Greenlee, Graham, and Cochise Counties, 5,000 to 



6,000 feet, occasional, usually in rocky canyons, May and June. 

 Southwestern New Mexico, southeastern Arizona, and northern 

 Mexico. 



