MUSTARD FAMILY 315 



41. Arabis secunda Howell. Secund Rock-cress. Fig. 2137. 



Arabis secunda Howell, Erythea 3: 33. 1895. 



Arabis Holboellii var. secunda Jepson, Man. Fl. PI. Calif. 430. 1925. 



Stems slender, densely stellate-pubescent, often glabrate above. Basal leaves linear-lanceolate, 

 entire, remotely toothed, densely stellate-pubescent; sepals 2-3 mm. long; petals 5-7 mm. long, 

 pink; pedicels slender, pubescent; pods closely reflexed, pubescent or sometimes glabrous, 3-7 

 cm. long, barely over 1 mm. wide or less ; seeds in 1 row in each cell. 



Dry gravelly flats and ridges, Arid Transition and Canadian Zones; eastern Washington to southern 

 California. Type locality: Mount Adams, Washington. May-July. 



42. Arabis puberula Nutt. Blue Mountain Rock-cress. Fig. 2138. 



Arabis puberula Nutt. in Torr. & Gray, Fl. N. Amer. 1: 82. 1838. 

 Arabis canescens Nutt. in Torr. & Gray, Fl. N. Amer. 1: 83. 1838. 

 Arabis tenuis Greene, Pittonia 4: 189. 1901. 



Perennial with a densely cespitose caudex, the stems 2-3 dm. high, finely stellate-pubescent. 

 Basal leaves linear-oblanceolate, 15-25 mm. long, entire, densely stellate-canescent ; stem leaves 

 linear, slightly auriculate ; petals pale purplish, 4 mm. long ; fruiting pedicels recurved, 2-6 mm. 

 long ; pods pendulous, 3-5 cm. long, 1 . 5-2 mm. wide ; seeds small, winged, in 2 rows. 



Dry hillsides, Arid Transition Zone; eastern Washington and Oregon to Montana and Wyoming. Type 

 locality: "Forests of the Blue Mountains of Oregon." April-July. 



47. ERYSIMUM L. Sp. PL 660. 1753. 



Annual, biennial or perennial herbs, rarely suffruticose, more or less pubescent with 

 2-forked hairs, the leaves simple, entire, toothed or lobed. Flowers yellow, in terminal 

 racemes. Silique linear, elongated, 4-angled or nearly terete; valves deciduous, strongly 

 keeled by a prominent midvein. Stigma lobed, the lobes produced above the placentae. 

 Seeds oblong, in 1 row in each cell; cotyledons incumbent or accumbent. [Name Greek, 

 meaning blister drawing.] 



A genus of about 90 species, widely distributed through the north temperate zone. Type species, Erysimum 

 cheiranthoides L. 



Pods terete or 4-angled or obscurely compressed; seeds not winged or if so only at the apex; cotyledons 

 incumbent. 

 Petals 4-8 mm. long. 



Fruiting pedicels very slender, 10 mm. long; pods ascending, 15-25 mm. long; annual. 



1. E. cheiranthoides. 

 Fruiting pedicels stout, 3-5 mm. long; pods 3-8 cm. long. 



Pods divaricately spreading, 6—8 cm. long; annual. 2. E. repandum. 



Pods erect, 3-4 cm. long, canescent; perennial. 3. E. inconspicuum. 



Petals 10-15 mm. long. 



Biennials or short-lived perennials, the flowering stems arising from the root crown or short caudex. 



4. E. capitatum. 

 Suffrutescent insular perennial. 5. E. insulare. 



Pods flattened parallel with the partition. 

 Style slender, 2 mm. long. 



Seeds neither winged nor margined; leaves oblanceolate, mostly basal; cotyledons incumbent. 



6. E. perenne. 



Seeds distinctly winged all around ; leaves narrowly linear, usually abundant on the stem ; cotyledons 

 accumbent. 7. E. occidentale. 



Style short and stout; seeds more or less conspicuously winged all around; cotyledons accumbent; 

 coastal species. 



Leaves oblanceolate, not fleshy. 8. E. concinnum. 



Leaves spatulate, with elongated petioles; fleshy. 9. E. Menziesii. 



1. Erysimum cheiranthoides L. Wormseed or Treacle Mustard. Fig. 2139. 



Erysimum cheiranthoides L. Sp. PI. 661. 1753. 



Cheirinia cheiranthoides Link. Enum. Hort. Ber. 2: 170. 1820. 



Cheiranthus cheiranthoides Heller, Cat. N. Amer. PI. 4. 1898. 



Annual, the stems erect, simple or branching, 2-5 dm. high, sparsely puberulent. Leaves 

 lanceolate or oblanceolate, 25-50 mm. long, entire or inconspicuously dentate; petals yellow, 4-5 

 mm. long; pods glabrous or essentially so, 1-1.5 mm. broad, nearly erect; valves keeled; style 

 slender, 1 mm. long ; seeds not winged ; cotyledons incumbent. 



Roadsides and waste places, Boreal and Upper Sonoran Zones; Alaska to Newfoundland, south to northern 

 California, Utah, and North Carolina, also in Europe. Type locality: European. June- Aug. 



2. Erysimum repandum L. Repand Wallflower. Fig. 2140. 



Erysimum repandum L. Amoen. Acad. 3: 415. 1756. 



Annual, minutely pubescent, the stems simple or usually much branched, 1-3 dm. high. 



Leaves lanceolate to linear-lanceolate, 3-6 cm. long, repand-denticulate ; petals 6-8 mm. long, 



yellow ; fruiting pedicels very stout, 2-3 mm. long ; pods 4-sided, 1 . 5-2 mm. thick ; beak short 

 and stout ; seeds not winged ; cotyledons incumbent. 



Roadsides and waste places, Arid Transition and Upper Sonoran Zones; eastern Washington and Oregon 

 to central California, eastward to the Atlantic States. Native of Europe. May— June. 



