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WOOTON AND STANDLEY FLORA OF NEW MEXICO. 265 



Pods ovate-cordate, 

 acute at the apex, 

 neither winged 



norretuse 12. Cardaria Cp. 271). 



Pods orbicular or ovate, 

 retuse or notched 

 at the apex, 



usually winged 13. Lepidium (p. 271). 



Cells 2-seeded ; pods broadest 

 at the summit, more or 

 less truncate. 

 Pods more or less winged; 

 plants glabrous; coty- 

 ledons accumbent 14. Thlaspi (p. 272). 



Pods wingless; plants with 

 branched hairs; coty- 

 ledons incumbent 15. Bursa (p. 273). 



Pods of various shapes, never compressed 

 nor flattened contrary to the septum. 

 Pods flattened parallel to the septum. 

 Valves of the pods elastically dehis- 

 cent; seeds in one row 17. Cardamine (p. 276). 



Valves of the pods not elastically dehis- 

 cent; seeds in one or two rows. 

 Pods short-oblong (in some species 

 almost oval), frequently spi- 

 rally twisted 18. Draba (p. 276). 



Pods elongate-Linear, never twisted. 19. Arabis (p. 279). 

 Pods not flattened nor compressed in any 

 direction (sometimes slightly com- 

 pressed at the apex in Lesquerella). 

 Pods short, globose, ovoid, or short- 

 cyUndric. 

 Valves of the pod nerved; cotyle- 

 dons incumbent 30. Camelina (p. 288). 



Valves not nerved; cotyledons 

 accumbent. 

 Pubescence conspicuously stel- 



iate; seeds flattened 16. Lesquerella (p. 274). 



Pubescence not stellate; seeds 



terete 24. Radicula (p. 283). 



Pods longer, terete or quadrangular. 

 Pods conspicuously beaked. 



Pods terete, moniliform (inde- 



hiscent) 20. Raphanus (p. 280). 



Pods quadrangular. 

 Beakof thepodflat, swordlike..21. Eruca (p. 281). 

 Beak of the pod elongated, 



conic or 4-angled 22. Brassica (p. 281). 



Pods not beaked, or at most only 

 tipped by the persistent style 

 or stigma. 



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