130 CRUCIFERAE. 



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

 ..UK-nut throughout with short stellate pubescence; leaves tripinnatifid, 



- .in. long, tin- segments linear or oblong, small; racemes elongated; pods 

 glabrous, L5 - 1 cm. long, curved upwards, on slender shorter pedicels; seeds 

 in tin t.v. 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; 



mentfl >>l" tin- lower leaves oblong; racemes loose; flowers bright yellow; 



da 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 

 *<>ft pubescence; pods 8-12 mm. long, shorter than the spreading pedicels. 

 W.iitsburg, Homer. 



165. 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-cleft; raceme dense; petals yellow, 4 mm. long, twice as long as the 

 s< pals; 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; 

 Mowers 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 petioled; pod orbicular-ovate, 5-10 mm. long, beaked with the short 



-p.l. . In moist gravelly places in early spring, the pods ripening and dehiscing 



rly. 'I he peppery pods are eaten by children. 



167. ALYSSUM. 



Low branching annual herbs; leaves mostly simple; flowers 

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

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



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

 puU m . nt throughout, usually branched from the base; leaves entire, spatulate, 

 1-1 em. long; Howers in racemes, 5-15 cm. long; petals pale vellow, cuneate, 



