446 SCROPHULARIACEAE (FIGWORT FAMILY) 



mostly at and near the apex only. In the northern Rocky Mountains and 

 extending into our range. 



31a. Pentstemon glaucus stenosepalus Gray, 1. c. Taller, 3-5 dm. high: 

 inflorescence glomerate: sepals attenuate-lanceolate: corolla dull whitish or 

 purplish. More common than the species; near timber line. 



32. Pentstemon caespitosus Nutt. Gray, Proc. Am. Acad. 6: 66. 1866. 

 Minutely cinereous-puberulent, spreading, forming depressed broad tufts 

 5-10 cm. high: leaves narrowly spatulate to almost linear, 8-20 mm. long, 

 including the tapering base or margined petiole: peduncles mostly secund 

 and horizontal, but with the flower upturned: sepals more acuminate, and the 

 margins below obscurely scarious: corolla tubular-funnelform, and the lower 

 side biplicate, the narrow folds sparsely villous within: sterile filament strongly 

 and densely bearded. Middle elevations; Wyoming, western Colorado, and 

 Utah. 



33. Pentstemon linarioides Gray, Bot. Mex. Bound. 112. 1859. Tufted, 

 with woody, multicipital caudex, minutely cinereous-pubescent throughout; 

 stems slender, numerous, and somewhat fascicled, erect or nearly so, many 

 merely small leafy shoots, the longer ones 2-4 dm. high: leaves crowded be- 

 low, linear, acute, tapering slightly to the base, 10-25 mm. long; the cauline 

 gradually reduced, the uppermost subulate bracts: inflorescence secund, the 

 lower peduncles about 4-flowered, shorter and fewer flowered upward: sepals 

 ovate, acuminate, scarious-margined, about as long as the corolla-tube proper: 

 corolla blue, tubular-funnelform, about 15 mm. long, sparsely bearded on 

 the lower lip: sterile filament short, with a close, short, yellow pubescence; 

 anther-cells dehiscent through the junction of the two cells. (P. color adensis 

 A. Nels. 1. c. 26: 355. 1899.) Arid grounds; Colorado to New Mexico and 

 Arizona. 



33a. Pentstemon linarioides Sileri Gray, Syn. Fl. 2 : 270. 1886. A dwarf and 

 suffruticulose form, with smaller and fewer flowers, mostly 1-flowered peduncles 

 subtended by proportionally longer floral leaves, and the lower lip less bearded. 

 P. teucrioides Greene, PL Baker. 3: 23. 1901. Southern Colorado. 



34. Pentstemon suffrutescens Rydb. 1. c. 28: 503. 1901. Suffrutescent, 

 low and rather slender, the older and more woody parts of the branches pros- 

 trate and rooting, the leafy and floriferous parts assurgent, the whole 1.5-3 dm. 

 long; branchlets retrorsely puberulent, as are also the pedicels and calyx: 

 leaves green and almost glabrous, often only 10-12 mm. long but rather 

 exceeding the internodes, spatulate-obovate, obtuse or some of the earliest 

 obcordate-notched, entire, those below the inflorescence with some fascicled 

 smaller ones in their axils, the upper with 1-3 flowers in their axils: 

 calyx parted deeply into linear-linguliform, abruptly acutish and minutely 

 ciliolate lobes: corolla elongated and narrow: anthers glabrous. (P. caespi- 

 tosus suffruticosus Gray; P. procumbens Greene, PL Baker. 3: 23. 1901.) 

 Arid districts; Colorado. 



35. Pentstemon Crandallii A. Nels. Bull. Torr. Bot. Club 26: 354. 1899. 

 Caudex woody, branched-caespitose ; the annual herbaceous stems slender, 

 erect, from moderately to very leafy, finely puberulent, 1-2 dm. high: leaves 

 linear-oblanceolate to spatulate, acute or obtuse at apex, 1-2 cm. long, nearly 

 or quite glabrous: inflorescence open; the short peduncles with 1-3 short- 

 pediceled flowers: sepals nearly linear, sparsely glandular-pubescent, about 

 4 mm. long: corolla moderately ventricose, with subequal lips, obscurely and 

 sparsely glandular-pubescent, a few long hairs in the throat: sterile fila- 

 ment moderately bearded for half of its length or more. (P. xylus A. Nels. 

 Bot. Gaz. 34: 32. 1902.) In the Colorado mountains. 



36. Pentstemon Harbourii Gray, 1. c. 271. Low-caespitose, with suffrutes- 

 cent caudex; tufted, nearly simple stems 5-10 cm. high, puberulent: leaves 

 green and glabrous, about 3 pairs, thickish, obovate, oval, or the uppermost 

 sometimes ovate and sessile by a broad base: thyrsus reduced to 2 or 3 

 crowded, short-pediceled flowers: sepals ovate-oblong, villous and somewhat 

 viscid: corolla little bilabiate, with rather broad cylindraceous throat and 

 tube, barely twice the length of the round-oval lobes; lower lip bearded within: 



