150 BRASSIACEAE. 



Family 59. BRASSIACEAE Lind. Mustard Family. 



I. Pods sessile or short-stipitate (in two species of Thelypodium) ; sepals erect or 

 conivent in anthesis ; anthers not twisted (except in Thelypodium). 



A. Pods compressed or flattened contrary to the narrow partition. 

 Pods not didymous ; plants not densely stellate, except in Smelowskya. 



Pods orbicular, oval or cuneate, strongly flattened ; plant not stellate. 

 Cells of the pod i-seeded. 



Pods ovate-cordate, acute at the apex, neither winged nor retuse. 



I . Cardaria. 

 Pods orbicular, elliptic or rarely ovate, retuse or notched at the apex, 

 usually winged. ^. Lepidium. 



Cells of the pods 2-seeded. 



Pods more or less winged ; cotyledons acumbent ; hairs of the plant 



simple or none. 3. Thlaspi. 



Pods cuneate, wingless ; cotyledons incumbent ; plants with branched 

 hairs. 4- Bursa. 



Pods ovate or lanceolate, not strongly flattened ; plant stellate. 



5. Smelowskya. 

 Pods more or less didymous ; plants stellate. 



Seeds solitary in each cell ; pods strongly flattened. 6. Dithyrea. 



Seeds several in each cell ; pods more or less inflated. 7. Physaria. 



B. Pods neither compressed nor flattened contrary to the partition. 

 1. Anthers not sagittate at the base. 



a. Pods terete or tetragonal. 



Pods short, scarcely more than twice as long as broad, or less. 

 Cotyledons accumbent ; valves of the pods nerveless. 



Pubescence stellate ; seeds flat. 8. Lesqueeella. 



Pubescence not stellate ; seeds terete. 10. Roripa. 



Cotyledons incumbent or folded transversely ; valves of the pod i-nerved ; 

 pubescence not densely stellate. 9. Camelina. 



Pods long, several times as long as broad. 



Pods scarcely beaked, merely tipped by a short style or a sessile stigma. 

 Pods terete or nearly so. 



Seeds in two rows in each cell of the pod. 

 Valves of the pod nerveless ; seeds globose or oblong, turgid ; 



cotyledons accumbent. 10. Roripa. 



Valves of the pods i -nerved; cotyledons at least partly in- 

 cumbent. 

 Seeds flattened; leaves entire or toothed 11. Turritis. 

 Seeds turgid; leaves pinnatifid. 13. Sophia. 



Seeds in one row in each cell of the pod. 



Glabrous perennials with creeping rootstocks. 



12. SCHOENOCRAMBE. 



More or less hairy annuals or perennials with tap-roots. 

 Pubescence of simple hairs ; leaves runcinate or entire. 



12a. Sisymbrium. 

 Pubescence of forked hairs ; leaves pinnately dissected. 



• 13. Sophia. 



Pods 4-angled. 



Stem leaves clasping by a cordate base. 23. Conringia. 



Stem leaves not clasping. 



Corolla white. 14. Stenophragma. 



Corolla yellow. 



Seeds plump ; leaf-blades entire or toothed. 



15. Erysimum. 

 Seeds flat ; leaf-blades pinnatifid. 1 6. Barbarea. 



Pod with a long distinct beak. 

 Beak flat and sword-like. 17. Sinapis. 



Beak elongated, conic or 4-angled. i8. Brassica. 



b. Pod flattened parallel to the broad partition. 



