Rvdberg: Studies on the Rocky Mountain Flora 277 



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, 5-10 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. cucnllatitm 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, 

 Rydberg & Vreeland, 621 J (type); Colorado Springs, 1895, E. A. 

 Bessey ; Ruton, 1840, Albert. 



4 Erysimum alpestre (Cockerell) 



Erysimum asperumf. 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- 

 12 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, 

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

 four-angled, slender, erect, 7-8 cm. long and 1.5 mm. in diameter : 

 style about 2 mm. long, stout. 



varyin 



In general habit, this species closely resembles E. asp 



M 



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

 of R asperum 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 



