120 CRUCIFERAE. 



Sisymbrium sophia L. Erect, much branched above, 30-100 cm. tall, 

 canescent throughout with short stellate pubescence; leaves tripinnatifid, 

 5-8 cm. long, the segments linear or oblong, small; racemes elongated; pods 

 glabrous, 1.5-2 cm. long, curved upwards, on slender shorter pedicels; seeds 

 in one row in each cell of the pod. Sparingly introduced. 



Sisymbrium incisum Engelm. Stem slender, erect or ascending, sparingly 

 branched, usually minutely stellate-pubescent; leaves pinnatifid or bipinnatifid; 

 segments of the lower leaves oblong; race.mes loose; flowers bright yellow; 

 pods 7-15 mm. long, acute, usually curved, ascending, on slender pedicels of 

 about the same length. Blue Mountains; rare in our limits. 



Sisymbrium incisum filipes Gray. Similar to the species but the segments 

 of the upper leaves elongate, often linear and entire; pods 10-15 mm. long, on 

 slender longer pedicels. Very common in fields and on open hillsides. 



Sisymbrium canescens Nutt. Similar to 5. incisum but gray with a short 

 soft pubescence; pods 8-12 mm. long, shorter than the spreading pedicels. 

 Waitsburg, Homer. 



165.5 CAMPE. 



Somewhat succulent perennials ; stems angled ; leaves entire or 

 pinnatifid; flowers yellow, in racemes; pod linear, terete, or 

 somewhat 4-angled, tipped with the short slender style; seeds 

 flat, in one row. 



Campe barbarea (L.) W. F. Wight. Bitter Cress. Perennial, glabrous; stems 

 simple or branched above, 30-90 cm. high; lower leaves pinnately cleft or 

 divided, the terminal segment large, orbicular or ovate, entire or nearly so; 

 lateral segments 1-5 pairs, smaller, oblong, entire or toothed; petioles short, 

 auricled at base; upper cauline leaves obovate, clasping, the lower part pin- 

 nately-clef t ; raceme dense; petals yellow, 4 mm. long, twice as long as the 

 sepals; pods erect or ascending, 2-3 cm. long, beaked by the slender style; 

 petals short and stout. Wet places, not common. 



166. PLATYSPERMUM. 



Low annual herb; leaves lyrate, few-lobed or subentire; 

 flowers minute, solitary, on naked scapes; pods compressed 

 parallel to the partition, short, suborbicular ; seeds broadly 

 winged, in two rows. 



Platyspermum scapigerum Hook. Glabrous; scapes 5-15 cm. tall, erect 

 or ascending; leaves spatulate-oblong, nearly entire, mostly coarsely 3-7- 

 lobed, all petipled; pod orbicular-ovate, 5-10 mm. long, beaked with the short 

 style. In moist gravelly places in early spring, the pods ripening and dehiscing 

 very early. The peppery pods are eaten by children. 



167. ALYSSUM. 



Low branching annual herbs; leaves mostly simple; flowers 

 yellow; style slender; pod ovoid or orbicular, compressed; valves 

 convex, nerveless; seeds one or two in each cell. 



Alyssum alyssoides (L.) Gouan. Annual, 10-30 cm. high, stellate- 

 pubescent throughout, usually branched from the base; leaves entire, spatulate, 

 1-2 cm. long; flowers in racemes, 5-15 cm. long; petals pale yellow, cuneate, 



