28 Sierra Club Publications. 



CRUCIFER/E. Cress Family. 



KEV TO THE GE^JERA. 



PODS SHORT, FLOWERS USUALLY VERY SMALL. 



Pods roundish, i-seeded, surrounded by a wing. 



Thysanocarpus, Lace-pod. 



Pods obcordate, 2-celled, flattened contrary to the partition. 



Capsella, Shepherd's Purse. 



Pods elliptical or lanceolate, 2-celled, flattened parallel to the 



partition, seeds not winged. . Draba, Mountain Cress. 



PODS ELONGATED, FLOWERS MORE CONSPICUOUS. 

 Flowers yellow. 



Pods somewhat 4-sided, flattened contrary to the partition, lower 

 leaves compound with the terminal leaflet rounded and larger 

 than the others. . . . Barbarea, Winter Cress. 

 Pods terete. Leaves compound. 



Sisymbrium, Hedge Mustard. 



Flowers white or rose-color. 



Pods 2-sided or terete with nerved valves, roots woody, seeds 



usually winged Arabis, Rock Cress. 



Pods flattened parallel to the partition ; calyx closed, with the 



sepals more or less united, purplish. 



Streptanthus, Jewel-flowers. 



Thysanocarpus curvipes Hook. Annual, simple or much 

 branched, lower part hirsute. Leaves in a bunch at the base, 

 dentate ; stem leaves auricled at base, pointed. Flowers in 

 corymbs, in fruit becoming a long raceme with the pods pendent 

 on recurved, capillary pedicels. Pods almost orbicular with a 

 perforated or crenate wing and tipped with a slender style. 

 Kings River Canon, Millwood, Converse Basin. 



Capsella Bursa=pastoris Medic. Leaves in a bunch at base, 

 with winged petioles, deeply dentate; stem leaves sessile with 

 arrow-shaped base. Racemes in fruit branched. Pods on spread- 

 ing, slender pedicels, obcordate, with the base wedge-shaped. 

 Common along the trails near camping places. 



Draba stenoloba Ledeb. Stems many from a tufted, leafy 

 base, slender, simple or branched, less than a foot high. Leaves 

 narrowly obovate or oblanceolate, entire or sparingly dentate, 

 stellate-pubescent ; stem leaves 1-2. Flowers yellow, turning 

 white or pinkish in fading, in fruit forming a long raceme with 

 the pods scattered. Pods smooth on slender pedicels, about the 

 same length, yi in., tipped with a sessile stigma. East Lake. 



