114 CRUCIFERAE. 



Pods terete, not compressed. 



Leaves pinnatifid. 163. RADictn-A, 118. 



Leaves entire or nearly so. 169. Camelina, 121. 



Pods compressed contrary to the parti- 

 tion. 

 Valves nerveless; pod obcordate. 170. Physaria, 121. 

 Valves 1 -nerved. 



Nerves of the valves acute, 

 forming keels or wings. 

 Silicles orbicular or obovate; 



cells 1-2-seeded. 171. Lepidium, 122. 



Silicles ovate or oblong; cells 



2-several-seeded. 172. Thlaspi, 122. 



Nerves of the valves obtuse, not 

 prominent. 

 Silicles cuneate, notched at 



the apex. 173. Bursa, 123. 



Silicles not cuneate, not 



notched at the apex. 174. Hutchinsia, 123. 



155. THYSANOCARPUS. 



Erect and slender sparingly branched annual herbs, with a 

 pubescence of simple hairs; flowers minute, white or rose-colored, 

 in elongated racemes; pod mostly pendulous, on a slender pedicel, 

 1-celled, indehiscent, disk-shaped or concave, orbicular, winged, 

 1 -seeded; seed flattened but not winged. 



Thysanocarpus curvipes Hook. More or less hirsute below, glabrous above ; 

 stem erect, usually branched above, 30-50 cm. tall; radical leaves oblong, 

 obtuse, dentate, 3-4 cm. long, narrowed at base, with a petiole; cauline sagit- 

 tate and clasping at base, acute, usually entire, commonly smaller; racemes 

 elongated, loose; pedicels slender, recurved; pods orbicular, ovate or obovate, 

 notched, apiculate by the persistent style, puberulent, 4-6 mm. long, the entire 

 or crenulate wings as broad as the body. Gravelly soils, not rare. 



Thysanocarpus curvipes madocarpus Piper. Pods glabrous. Quite as 

 common as the species but nearly always growing by itself. 



156. ATHYSANUS. 



Slender annual herbs, usually branching at the base, with a 

 pubescence of branched hairs; flowers minute, in racemes; petals 

 small, white, or none; style short; ovules 3-4, only one maturing; 

 pod orbicular, indehiscent, not margined, nerveless, 1-celled, 

 1 -seeded, 



Athysanus pusillus (Hook.) Greene. Stems slender, branched from the 

 base, 10-20 cm. tall, hirsute-pubescent throughout; leaves oblong-lanceolate, 

 acute, usually coarsely dentate, rough-pubescent, 5-30 mm. long; racemes 

 loose, elongate; flowers very small, on curved pedicels; petals linear, minute, 

 or wanting; pods orbicular, about 2 mm. in diameter, hirsute, on recurved 

 longer pedicels. Stony soil, rather common. 



