750 SCROPHULARIACEAE 



33 Penstemon Thompsoniae (A. Gray) Rydb. Thompson's Penstemon. 



Fig. 4670. 



Penstemon putnilus var. Thompsoniae A. Gray, Syn. Fl. N. Amer. 2^: 269. 1878. 

 Penstemon Thompsoniae Rydb. Bull. Torrey Club 36: 690. 1909. 



Stems prostrate or ascending, arising from a woody caudex surmounting a fibrous-rooted 

 underground stem, scarcely creeping, forming tufts or mats 2-5 cm. high and 10-25 cm. across. 

 Leaves entire oblanceolate to spatulate-oblong, mucronate, cmereous-whitened with closely ap- 

 pressed hairs,' 1-2 cm. long; thyrsus racemiform, leafy, obscurely viscid ; calyx-lobes acummate 

 to attenuate with or without a narrow scanous margin toward base ; corolla blue-violet, 1 J-l» 

 mm. long, up to 5 mm. wide at throat, nearly tubular, the palate bearded ; anther-sacs ovate- 

 oblong; staminode golden bearded for most of its length. 



Hravellv slooes Upper Sonoran Zone; Mojave Desert of eastern California (Clark Mountain), east to 

 south^attern Nevada, somhern Utah, and northern Arizona. Type locality: "S. Utah, Mrs. Thompson." May- 

 June. 



34 Penstemon calif ornicus (Munz & Jtn.) Keck. California Penstemon. 



Fig. 4671. 



Penstemon linarioides var. californicus Munz & Jtn. Bull. S. Calif. Acad. 23: 31. 1924. 

 Penstemon californicus Keck, Bull. Torrey Club. 64: 378. 1937. 



Stems 5-15 cm. high, tufted, densely leafy below, the herbage cinereous-puberulent through- 

 out with appressed flattened hairs. Leaves linear-oblanceolate, the largest 8-15 mm. long, mucro- 

 nate, thickish ; thyrsus racemiform, minutely glandular ; calyx-lobes ovate, acute to acuminate, the 

 margin scarious; corolla narrowly tubular-funnelform, purplish blue, 14-18 mm. long, 4.5-6 mm. 

 wide pressed; anther-sacs ovate-oblong; staminode yellow-bearded most of its length or chiefly 



apically. 



Upper Sonoran Zone; San Jacinto Mountains, California, to Sierra San Pedro Martir, Lower California. 

 Type locality: Kenworthy, Hemet Valley, San Jacinto Mountains. May-July. 



35. Penstemon Thurberi Torr. Thurber's Penstemon. Fig. 4672. 



Penstemon Thurberi Torr. Pacif. R. Rep. 7»: 15. 1856. 



Penstemon ambiguus var. Thurberi A. Gray, Proc. Amer. Acad. 6: 6S. 1862. 



Leiostemon Thurberi Greene, Leaflets Bot. Obs. 1 : 223. 1906. 



A rather intricately branched bush 3-6 dm. high, woody below, the numerous slender erect 

 stems unbranched or with few to several ascending branches, glabrous throughout. Leaves bright 

 green, equally distributed, entire, more or less scabrid on the margin, mostly narrowly linear and 

 involute, 1-3 cm. long, 1 mm. wide, but some older leaves often as much as 3 mm. wide ; thyrsus 

 racemose, the short divaricate peduncles mostly 1 -flowered; calyx 2-3 mm. high, the broadly 

 ovate lobes abruptly acuminate, entire; corolla lavender-rose, 12-15 mm. long, obliquely salver- 

 form, the limb large; anther-sacs oval, explanate, 0.75 mm. long; staminode included, glabrous, 



Sandy ground. Upper Sonoran Zone; southern California in the Providence Mountains, the Little San 

 Bernardino Mountains, and San Felipe, to northern Lower California, Arizona, and New Mexico, lype 

 locality: Burro Mountains, New Mexico. May-June, sometimes blooming again Sept.-Oct. 



36. Penstemon monoensis Heller. Mono Penstemon. Fig. 4673. 



Penstemon monoensis Heller, Muhlenbergia 2: 246. 1906. 



Penstemon divergens M. E. Jones, Contr. West. Bot. No. 12:246. 1908. 



Stems 15-35 cm. high, densely cinereous-puberulent. Leaves entire, the margin often crisped, 

 densely scurfy puberulent, large, the basal with lance-oblong to broadly oval blades, the cauline 

 narrowly elliptic below to deltoid-ovate and broadly clasping above ; thyrsus densely glandular- 

 pubescent, of 4-8 dense clusters ; calyx 7-8 mm. high, up to 12 mm. high in fruit, the lobes linear- 

 lanceolate ; corolla rose-purple or wine-red, 14-20 mm. long, 4-6 mm. wide pressed, tubular- 

 funnelform, glabrous within or sometimes the palate sparingly pilose; anther-sacs divergent, 

 dehiscent quite to proximal apices, not explanate, 1.5 mm. long; staminode included, strongly 

 bearded for its outer half with fine short yellow hairs. 



Dry hills and sandy washes. Upper Sonoran Zone: desert ranges bordering Owens Valley, Mono and 

 Inyo Counties, California. Type locality: base of the White Mountains near Southern Belle Mine. May-June. 



37. Penstemon calcareus Brandg. Lime Penstemon. Fig. 4674. 



Penstemon calcareus Brandg. Zoe 5: 152. 1903. Not M. E. Jones, 1908. 

 Penstemon desertorum M. E. Jones, Contr. West. Bot. No. 12: 59. 1908. 



Stems 5-25 cm. high, densely pruinose-puberulent, anthocyanous. Leaves entire, or some of 

 them obscurely denticulate, puberulent, the basal with elliptic to broadly ovate blades 1.5-4 cm. 

 long, the cauline linear- to oblong-lanceolate, the uppermost often subcordate-amplexicaul ; 

 thyrsus densely glandular-pubescent, of 2-6 congested clusters; calyx 6 mm. high (in flower), 

 up to 11 mm. high in fruit, the lobes linear-lanceolate; corolla light rose-red to rose-purple, 

 12-14(-17) mm. long, 2.5-4 mm. wide pressed, narrowly tubular, palate sparingly pilose; anther- 

 sacs widely divaricate, rotund, peltately explanate, 0.5-0.6 mm. long; staminode included, 

 strongly bearded for two-thirds its length with rather coarse golden-yellow hairs. 



Dry canyonsides. Lower Sonoran Zone; Grapevine Mountains, north end of Death Valley, and Providence 

 Mountains, Mojave Desert, California. Type locality: "the face of perpendicular limestone cliffs of Providence 

 Mt." May. 



