20 CRUCIFER^. , 



* Pods flattened parallel ^mth the partition, the placental rQ>8 forming the margin: radicle 

 of the bent embryo lying against one edge of the cotyledons (accumbentj. 



Pods orbicular, nerveless: flowers small, white or yellowish. 



Pods large, flat: seeds orbicular, flat, thin-margined: scapes 1 -flowered 1 



Pods less than 2 lines broad: flowers in racemes: leaves spatulate, entire 2 



Pods ovate or lanceolate to linear or oblong not an inch long 3 



Pods narrowly linear, valves nerveless, partition thickened. 



Pods long-beaked : stem leaves few, close together near the top 4 



Pods short-beaked: leaves scattered: racemes longer 6 



Pods linear or narrower, an inch or more long, 1 -nerved: seeds flat. 



Anthers short: petals white, purple or rose-color: claw narrow, blade flat 6 



Anthers sagittate at base: petals usually unequal and crispate or twisted 7 



Sepals broad, not colored, the outer gibbous: petals broad, blade flat 8 



* * Pods terete or scarcely flattened, often 4-o>'ngled: radicle ly^g against the side of the 



cotyledons or embracing them (incumbent), or turned partly to one side (oblique). 

 + Pods slender, 1 to 4 inches long; valves 1-nerved: seeds oblong, slightly flattened; cotyledons 



often oblique. 



Flowers white to purple: anthers sagittate. 



Petals undulately crisped, little exceeding the large sepals: claw broad 9 



Petals with flat limb much exceeding the narrow sepals 10 



Flowers yellow, large: stem leaves narrow, mostly entire. 



Anthers linear, at length coiled: pods on long stipes, curved 11 



Anthers sagittate: stigma 2-lobed: pod 4-angled ; no stipe 12 



+ t Pods linear, often less than an inch long: seeds in one row (except in 1st sp's. of No. 15 

 and in No. 16) : at least the lower leaves pinnatifid. 



Seeds globose: cotyledons infolding the radicle: anthers sagittate 13 



Seeds oblong: anthers oblong: leaves lyrately pinnatifid, smooth 14 



Seeds oblong, small: anthers sagittate: petals 1 to 3 lines long 15 



Seeds in two rows: pods 4 to 6 lines long; valves nerveless 16 



+ 1 1 Pods oblong-ovoid to globose, beaked with the slender style. 



Densely stellate-pubescent: leaves mostly entire: flowers yellow 17 



* * * Pods flattened contrary to the narrow partition. 



Pods linear, | to 2| inches long, on slender axillary peduncles 18 



Pods ovoid, scarcely flattened, on slender scapes. Aquatic 19 



Pods linear, nearly terete: cotyledons 3-parted: petals included 20 



Pods angular-obcordate or oblong-obovate, many-seeded 21 



Pods oblanceolate to obovate or cuneate-oblong, 4-8-seeded 22 



Pods orbicular to obovate, 2-winged above, 2-seeded 23 



§ 2. Pods not splitting open when ripe: petals minute or wanting except in the last. 

 Pods with 2 small globular seed-like cells, rough 24 



