277 RvDBERG : Studies on the Rocky Mountain Flora 



sparingly puberulent on both sides, divided to the base into 5—7 

 segments, which are 6—12 cm. long and twice cleft into linear lobes 

 3—5 mm. broad : inflorescence branched, densely many-flowered : 

 pedicels 1—3 cm. long, rather stout, usually equalled or surpassed 

 by the linear bracts : bractlets filiform, 5— lo mm. long, inserted 

 close under the calyx : sepals dark blue, paler at the base, ellipti- 

 cal, all except the upper one obtuse, 12—15 mm. long; spur 12 

 mm. long, slightly curved : upper petals narrow, light brownish, 

 striate : lateral petals with slender claws bent at right angles, 

 bearded only within, deeply 2 -cleft at the apex. 



This species in perhaps closest related to D. cuatllatum A. 

 Nelson but differs in the longer and narrower leaf-segments, the 

 more branched inflorescence, the stouter habit, the longer bracts 

 and bractlets and narrower upper petals. It grows at an altitude 

 of about 2500 m. 



Colorado : Wahatoya Creek, below the Spanish Peaks, 1900, 

 Rydbcrg & Vrccland, 621 j (type); Colorado Springs, 1895, ir". A. 

 Bcsscy ; Ruton, 1840, Albert. 



Erysimum alpestre (Cockerell) 



Erysiumm aspcruni f. alpestre Cockerell, Bull. Torr. Club, 18 : 

 168. 1891. 



A tall strigose perennial with a deep tap-root : stem strict, sim- 

 ple, 3-6 dm. high, striate : basal leaves linear or narrowly linear- 

 oblanceolate, 5-10 cm. long, 2-7 mm. wide, subentire or sinuately 

 denticulate, grayish strigose, gradually tapering below with a short 

 petiole : stem leaves mostly narrowly linear, the upper sessile : 

 raceme at first short and corymbiform, in fruit much elongated : 

 pedicels short, in fruit scarcely i cm. long, ascending: calyx 10- 

 1 2 mm. long, yellow : two of the sepals strongly saccate at the 

 base : petals with slender claws : blades broadly obovate-cuneate, 

 slightly emarginate, about 8 mm. long and broad, varying from 

 orange or brown to rose-purple or the older pale yellow : pods 

 four-angled, slender, erect, y-"^ cm. long and 1.5 mm. in diameter : 

 style about 2 mm. long, stout. 



In general habit, this species closely resembles E. aspcnmi. 

 Mr. Cockerell, who seems to have been the first to observe this in- 

 teresting plant of the Sangre de Christo region, took it to be a form 

 of E. asperuin with peculiarly colored petals, found only at high 

 altitudes. I was first of the same opinion until I saw the fruit 

 in the type number and still better developed in Mr. Bessey's 



