318 BRASSICACEAE 



3. Erysimum inconspicuum (S. Wats.) MacM. Small-flowered Prairie-rocket. 



Fig. 2141. 



Erysimum parviflorum Nutt. in Torr. & Gray, Fl. N. Amer. 1 : 95. 1838. Not Pers. 

 Erysimum asperum var. inconspicuum S. Wats. Bot. King Expl. 24. 1871. 

 Erysimum inconspicuum MacM. Met. Minn. 268. 1892. 



Perennial, the whole plant canescent, stems erect, simple or sparingly branched, 3-6 dm. 

 high. Leaves linear to oblanceolate, 25-75 mm. long, entire or dentate; petals yellow, 6-8 mm. 

 long; fruiting pedicels stout, 4-6 mm. long, ascending; pod erect, 2-4 cm. long, 2 mm. wide, 

 cancescent ; style 1-2 mm. long, nearly as thick as the pod. 



Dry plains, Arid Transition and Upper Sonoran Zones; Alaska and Ontario south to Nevada, Colorado, 

 and Kansas. In the Pacific States occurring in eastern Washington and Oregon. Type locality: Diamond Valley, 

 Nevada. May-July. 



4. Erysimum capitatum (Dougl.) Greene. Douglas' Wallflower. Fig. 2142. 



Cheiranthus capitatus Dougl. in Hook. Fl. Bor. Amer. 1: 38. 1829. 

 Erysimum elatum Nutt. in Torr. &• Gray, Fl. N. Amer. 1: 95. 1838. 

 Erysimum capitatum Greene, Fl. Fran. 269. 1891. 

 Cheiranthus elatus Greene, Pittonia 3: 135. 1896. 

 Cheirinia elata Rydb. Bull. Torrey Club 39: 323. 1912. 



Biennial, rough-pubescent and more or less densely canescent, 3-10 dm. high, simple or with a 

 few branches above. Basal leaves lanceolate or linear tapering into the petiole, dentate or entire ; 

 stem leaves, at least the upper, sessile; petals yellow or commonly orange, 15-20 mm. long ^fruit- 

 ing pedicels stout, 4-6 mm. long, spreading ; pods narrowly linear, 4-10 cm. long, 2 mm. wide, 4- 

 angled and only slightly compressed, rough-pubescent ; styles short and thick ; seeds oblong- 

 ellipsoid, often winged at the apex. 



Open hillsides, Transition and Upper Sonoran Zones; British Columbia to northern California, east to 

 Idaho. Type locality: "on rocky places of the Columbia near the sea, and at Puget Sound." March-Aug. 



This species is closely related to Erysimum asperum (Nutt.) DC. of the Rocky Mountain and Great Plains 

 regions, and might be considered as a subspecies. The name has been misapplied to the flat-podded species 

 of coastal California. 



5. Erysimum insulare Greene. Island Wallflower. Fig. 2143. 



Erysimum insulare Greene, Bull. Torrey Club 13: 218. 1886. 

 Cheiranthus insularis Greene, Pittonia 3: 131. 1896. 



Shrubby, diffusely branching, forming a dense tuft about 3 dm. high, and 0.5-2 m. broad, 

 cinereous with a minute appressed pubescence of 2-forked hairs. Leaves crowded upon the 

 numerous woody branches, narrowly linear, entire, firm; racemes short and dense, short- 

 pedunculate or subsessile; petals yellow, about 15 mm. long; pods linear 5 cm. long, 3-4 mm. 

 thick, quadrangular, style stout; seeds not winged. 



Sandy slopes, San Miguel and Santa Rosa Islands, southern California. Type locality: sandy slopes above 

 Cuyler's Harbor, San Miguel Island. March-July. 



6. Erysimum perenne (S. Wats.) Abrams. Sierra Wallflower. Fig. 2144. 



Erysimum asperum var. perenne S. Wats, ex Coville, Proc. Biol. Soc. Wash. 7: 70. 1892. 

 Cheiranthus perennis Greene, Pittonia 3: 132. 1896. 

 Erysimum nevadense Heller, Muhlenbergia 1: 52. 1904. 



Perennial, the crown of the root clothed with the remains of old leaves, whole plant green 

 and only sparingly puberulent. Basal and lower stem leaves oblanceolate, 3-5 cm. long, the blade 

 inconspicuously runcinate-dentate, shorter than the slender petiole; upper leaves narrowly 

 oblanceolate and short-petioled ; petals yellow, about 15 mm. long; fruiting pedicels ascending, 

 about 1 cm. long; pods ascending or somewhat spreading, 6-7 cm. long, 2 mm. wide, flattened; 

 beak slender, 3-4 mm. long; seeds not winged or inconspicuously so at one end; cotyledons 

 incumbent but slightly oblique. 



Stony alpine slopes, Boreal Zones; Sierra Nevada, California. Type locality: between Mineral King and 

 Farewell Gap, Sierra Nevada. June-Aug. 



7. Erysimum occidentale (S. Wats.) Robinson. Western Wallflower. 



Fig. 2145. 



Erysimum asperum var. pumilum S. Wats. Bot. King Expl. 24. 1871. 

 Cheiranthus occidentalis S. Wats. Proc. Amer. Acad. 23: 261. 1888. 

 Erysimum occidentale Robinson in A. Gray, Syn. Fl. N. Amer. I 1 : 144. 1895. 

 Cheirinia occidentalis Tidestrom, Contr. U.S. Nat. Herb. 25: 246. 1925. 



Biennial, 1-3 dm. high, stem solitary or sometimes several from the same taproot, leafy, 

 cinereous throughout. Basal leaves numerous, linear, tapering to the petiole; stem leaves many, 

 similar to the basal, but short-petioled, or the uppermost sessile ; racemes densely flowered ; 

 petals pale yellow, 15-20 mm. long; fruiting pedicels stout, 6-10 mm. long, ascending; pods 

 ascending, 7-10 cm. long, flattened, 3 mm. broad; style rather slender, 2-3 mm. long; seeds 

 distinctly winged all around. 



Dry plains and hillsides, Upper Sonoran Zone; southeastern Washington through eastern Oregon and 

 Idaho to Nevada. Type locality: Klickitat County, Washington. May-July. 



