174 CRUCIFERAE. 



Erysimum arenicola Wats. Perennial, several-stemmed from a loosely 

 branched base, 15—20 cm. high; leaves mostly basal, oblanceolate, sparsely 

 denticulate, 3-4 cm. long, sparingly pubescent with appressed hairs; flowers 

 bright yellow; pod somewhat flattened, very gradually attentuate into a long 

 beak; valves 1-nerved. 



In sandy soil at high altitudes in the Olympic Mountains. 



Erysimum asperum (Nutt.) DC. Whitish throughout with appressed 

 pubescence; stems simple, stout, 15-40 cm. tall, erect; leaves lanceolate or 

 oblanceolate, entire or somewhat dentate, rarely lobed, mostly petioled, 6-10 

 cm. long; flowers bright yellow; petals 15-25 mm. long; pods stout, somewhat 

 4-angled, about 8 cm. long, tipped with a short stout beak and a large 2-lobed 

 stigma; pedicels stout, 1 cm. long. 



In open places, in our limits only at high altitudes, 1500-2000 m., in the 

 mountains. 



Erysimum capitatum (Hook.) Greene. (E. datum Nutt.). Very similar 

 to E. asperum; taller, usually 30-90 cm. high, more leafy, the leaves greener 

 and subentire, acuminate; pods 5-10 cm. long, the stigmas not deeply lobed; 

 seeds lenticular, thin and scarious-winged at one end. 



On rocky cliffs, along the lower Columbia River and northward. 



226. SMELOWSKIA. 



Low cespitose canescent perennials with pinnatifid leaves; 

 flowers small, in terminal racemes; petals entire, obovate or 

 spatulate; style short or none; pods lanceolate-oblong, compressed 

 at right angles to the partition; valves sharply keeled so that 

 the pod is 4-angled. 



Capsule lanceolate, attenuate at each end. S. calycina. 



Capsule ovate, nearly subcordate at base. 5. ovalis. 



Smelowskia calycina C. A. Mey. Densely cespitose from a stout branched 

 caudex covered with the bases of old leaves; herbage densely canescent with 

 stellate and a few longer simple hairs; stems 5-15 cm. high; leaves pinnate or 

 deeply pinnatifid, the segments linear to oblong, obtuse; flowers white, often 

 pink-tinged; pods lanceolate, attenuate at each end, 6-10 mm. long. 



Rocky places in the mountains at 2000-2500 m. altitude. 



Smelowskia ovalis Jones. Very similar to 5. calycina but more densely 

 pubescent; pods ovate, truncate or subcordate at base. 



Olympic Mountains and Cascade Mountains at high altitudes. 



227. BRASSICA. 



Erect annual or biennial herbs; lower leaves mostly pinnate 

 or lyrate, with a large terminal lobe; flowers yellow; pod terete or 

 nearly so, tipped with a slender conical or somewhat flattened 

 beak; seeds globose, in 1 row or rarely in 2 rows in each cell. 



Cauline leaves auricled at base and clasping. B. campestris. 



Cauline leaves not auricled nor clasping. 



Beak of the pod very short, less than one fourth the fertile 



portion. B. nigra. 



Beak of the pod long, about equaling the fertile portion. 



Herbage hispid; upper leaves sessile. B. arvensis. 



Herbage nearly glabrous; upper leaves short-pctioled. B.juncea. 



