WOOTON AND STANDLEY FLORA OF NEW MEXICO. 265 



Pods ovate-cordate, 

 acute at the apex, 

 neither winged 



norretuse 12. Cakdahia (p. 271 l. 



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 accumbont 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 notflattened nor compressed in any 

 din ction (sometimes slightly com- 

 pressed at the apex in Lesquerella). 

 Pods short, globose, ovoid, or ahort- 

 cylindric. 

 Valves of the pod nerved; cotyle- 

 dons incumbent 30. ('ami usa ^p. 288). 



Valves not nerved; cotyledons 

 accumbenl 

 Pubescence conspicuously stel- 



Late; seeds Battened L6. Lesquebej la (p. 274). 



Pubescence nol st< Hate; eedi 



terete 24. Radicula (p. 2 



Pods longer, ter< te or quadrangular. 

 Pods conspicuously beaked. 

 Pods terete, moniliform (inde- 



hiacent) 20. Raphani B(p. 280 



Pods quadrangular. 

 Beak of the pod flat, swordlike.. 21. Ei - 1 1 



Beak of the pod elongated, 



conic or (-angled 22. Ba » bica i p 



ii. .t beaked, or al mosl only 

 t ipped bj i be |» tHurto Ql tj 1<- 

 or si i 



