272 SCROPHULARIACEJE. Penlstemon. 



* * * Glabrous or merely puberulent : leaves all entire. 

 H Corolla blue or violet, half inch long, sleuder-fmmelform, moderately bilabiate : sterile filament 



lightly bearded. 



P. gracilentus, Gray. Stems slender from a lignescent base, a foot or more high, 

 rather few-leaved, nuked above, terminating in a loose and rather simple paniculate thyr- 

 sus : leaves glabrous and green, lanceolate, or the upper linear and the lowest sometimes 

 oblong, all narrowed at base: peduncles (and calyx) viscid-puberulent, 2-5-flowered; the 

 lower elongated : pedicels short : corolla-lobes only 2 lines long, moderately spreading. 

 Pacif. R. Rep. vi. 83, Proc. Am. Acad. vi. 75, & Bot. Calif, i. 561. Mountains, N. Cali- 

 fornia and adjacent parts of Oregon and Nevada, at 5-8,000 feet. 



i -t Corolla blue to purple, more ventricose-funnelform, short-bilabiate, two-thirds to an inch 

 and a half long: sterile filament glabrous. (Species too nearly allied, mostly lignescent or 

 rather shrubby at base.) 



H- Inflorescence and calyx glandular or viscid-pubescent: thyrsus open-paniculate. 



P. l&tus, Gray. A foot or so high, cinereous-pubescent or puberulent, above glandular- 

 pubescent : leaves lanceolate or linear-lanceolate and the lowest spatulate : sepals ovate or 

 oblong, herbaceous: corolla an inch long, blue. Jour. Bost. Nat. Hist. Soc. vii. 147, Proc. 

 Am. Acad. 1. c., & Bot. Calif. 1. c. Open and dry grounds, California to the mountains 

 above the Yosemite and apparently even to Siskiyou Co. 



P. Rcezli, Regel. Smaller, a span to a foot high, below glabrous or minutely puberu- 

 lent : leaves all lanceolate or linear, or the lower oblanceolate: thyrsus either narrow or 

 more diffuse and compound, with the branches divergent: corolla smaller (from half to 

 two-thirds inch long) and narrower, pale blue or violet. Act. Hort. Petrop. ii. 326, & 

 Gartenfl. 1872, t. 239; Gray, Bot. Calif, ii. 567. P. heteropliyllus, var.? Torr. & Gray in Pacif. 

 R. Rep. ii. 122. Drier parts of the Sierra Nevada, California, from Kern Co. to frontiers 

 of Oregon and adjacent Nevada. Approaches smaller forms of the preceding. 



-H- -H- Inflorescence and calyx, as well as foliage, perfectly glabrous or else minutely puberulent 

 without glandulosity ; thyrsus usually narrow. 



P. Kingii, ^ATatson. Hardly glaucous: stems a span or so high from the depressed 

 ligneous base, leafy to the top, erect or ascending : leaves oblanceolate or lanceolate-linear, 

 acutish or obtuse, mostly narrowed to the base, an inch or so long : thyrsus strict, 1 to 5 

 inches long : sepals ovate-lanceolate and slender-acuminate, equalling the capsule : corolla 

 comparatively small (two-thirds inch long), ''purple." Nevada and Utah, from the W. 

 Humboldt to the Wahsatch and Uinta Mountains, Watson, &c. 



P. azureus, Bentll. Glaucous, rarely pruinose-puberulent : stems erect or ascending, 1 to 

 3 feet high : leaves from narrowly to ovate-lanceolate or even broader, the uppermost 

 wider at base : thyrsus virgate, loose, usually elongated : sepals ovate, with or without a 

 conspicuous acumination : corolla from 1 to 1 inches long, azure-blue verging or changing 

 to violet, the base sometimes reddish; the expanded limb sometimes an inch in diameter. 

 PL Ilartw. 327; Gray, 1. c. ; "Paxt. Fl. Card. t. 64; Lem. Jard. Fl. t. 211 ; Moore, Mag. 

 1850, t. 209." Dry ground, California, apparently through the length of the State, com- 

 mon on the Sacramento, &c. Founded on a rather narrow-leaved form, but varies greatly 

 in the foliage. 



Var. Jaffirayanus, Gray, 1. c. A low form : leaves oblong or oval, or the upper 

 ovate-lanceolate or ovate, very glaucous : peduncles 1-5-flowered : flowers large. P. 

 Ja(fmijmniis, Hook. Bot. Mag. t. 5045. P. (jlauclfolius, Gray in Pacif. R, Rep. vi. 82. 

 P. heterophyllus, var. latifoUns, Watson, Bot. King, 222? Northern part of California and 

 through the Sierra Nevada, also eastward to the Wahsatch Mountains in Utah, if the syn. 

 Bot. King is rightly referred. 



Var. parvulus. Less than a foot high : leaves oblong and oval, barely an inch long : 

 many-flowered thyrsus rather open: sepals broadly ovate: corolla hardly three-fourths 

 inch long: would be referred to the preceding variety, except for the smaller flowers. 

 Northern part of California, in mountains above Jackson Lake, at 8,000 feet, Greene. 



Var. angustissimus, the extreme narrow-leaved form : leaves narrowly linear or 

 sometimes the uppermost narrowly lanceolate from a broad base. Yosemite Valley, &c. 



Var. ambigUUS, a rather tall form, paniculately branched and slender, with lanceo- 

 late and linear leaves all narrowed at base in the manner of the following species, but pale 

 and glaucescent, and the corolla violet-blue (only an inch or less long) : sepals remarkably 



