Heller: Plants from Western North America 591 



cent, has much thuincr, larger leaves, on longer and more slender 

 petioles ; the inflorescence is less compact, the calyx is broader 

 with broader and shorter spreading lobes, and the flower has a 

 much broader tube and equal lips. It is closer to S. cillata, but 

 is distinguished by the thin, light green foliage, spreading calyx, 

 and shorter, equally lobed corolla. 



Pentstemon Arizonicus 



Slender erect, 1.5-2 dm. high, with several usually prostrate, 

 short branches at base, these leaf-bearing only : leaves opposite, 

 coriaceous, glabrous, dull green, those of the short prostrate 

 branches oval, obtuse, finely crcnate or merely undulate I-3 cm. 

 ■long 5- mm. to i cm. wide, tapering into a winged petiole ; leaves 

 of the erect stem in about five pairs, the lowest oblanceolate, peti- 

 oled finely crenate, about 2 cm. long, 5-7 mm. wide ; those on 

 the middle portion of the stem ovate -lanceolate, sessile at the 

 broad base, thence gradually narrowing to the acute apex, a little 

 over X cm. long, nearly i cm. wide at the base, entire, as are the 

 upper shorter ones, which are lanceolate, acuminate : mflorescence 

 appearing as if secund, lax, scattered over the upper half of the 

 stem • peduncles and pedicels very slender, the former I cm or 

 more in length, nearly smooth, the latter about 5 mm. long, pubes- 

 cent with slightly kinky hairs: calyx almost i cm. long, as long 

 as the corolla-tube, pubescent and somewhat glandular, the lobes 

 lanceolate, long-acuminate, slightly scarious near the base, ciliate : 

 corolla apparently purplish, nearly 3 cm. long, minutely puberu- 

 lent, abruptly dilated above the calyx: sterile filament glabrous, 

 not 'enlarged above ; anther sacs divergent. 



Collected by Dr. D. T. MacDougal in shaded places on the 

 inner slopes of the crater of San Francisco Mountain, near Flag- 

 staff, Arizona, August 8, 1898. The type specimen is deposited 

 in the herbarium of the New York Botanical Garden. 



Erigeron MacDougalii 



Appressed pubescent, perennial by decumbent rooting stems 

 or stolons : stems slender, weak, curved, seldom or never branch- 

 ing • leaves entire, the basal ones spatulate, obtuse, 2 cm. long, 

 more than half of which length is petiole; stem leaves scattered, 

 linear or the lower ones linear-spatulate, acute or acutish, about 5 

 mm long, i mm. wide : peduncles scapose, or very rarely borne 

 on a branch, pubescent above, 5 cm. long; heads 1. 5 cm broad, 

 5 mm hicrh ; involucre hemispheric, its bracts narrow, pubescent, 

 somewhat scarious-margined, tipped with a brown point: rays 

 numerous, purplish : pappus double. 



