CRUCIFERjE. 17 



synopsis of the Genera. 



* Pod dehiscent by 2 valves, usually much longer than broad. 



1. Nastitr'f ium. Flowers white or yellow. Pod terete, oblong-linear 



or ellipsoid. Seeds in two rows in each cell, globular, without a 

 wing. Cotyledons accumbent. 



2. Barbarc'a. Flowers yellow. Pod somewhat 4-sided, the valves 



strongly 1-nerved. Seeds in one roio in each cell. Cotyledons 

 accumbent. 



3. Yesica'ria. Flowers yellow. Plant densely hoary with stellate 



hairs. Pods ovate or globose. Seeds flattened, in two rows in 

 each cell. Cotyledons accumbent. 



4. Denta'ria. Flowers white or pale purple. Pod lanceolate, flat. 



Seeds wingless, on broad seed-stalks. Stem-leaves 2 or 3 in a 

 whorl ; stem naked below. Root-stock toothed or tuberous. 

 Cotyledons accumbent. 



5. Cardam'iue. Flowers white or rose-coloured. " Pod linear or lance- 



olate, flat, the valves nerveless. Seeds wingless, on slender seed- 

 stalks. Stem leafy below. Cotyledons accumbent. 



6. Ar'abis. Flowers white or whitish. Pod linear or elongated, flat- 



tened, the valves usually tvith a distinct mid-rib. Stem leafy. 

 Cotyledons accumbent. 



7. Erys'iiniiiu. Flowers yellow (or creamy). Pod linear, distinctly 



4-sided. Stigma broadly 2-lobed. Pedicels of the pods diverging 

 from the stem. Leaves simple, not clasping. Pubescent with 

 appressed hairs. Cotyledons incumbent. 



8. Sis> in hriimi. Flowers yellow, small. Pods awl-shaped or 4-6- 



sided, the valves 1-3-nerved. Stigma small. Cotyledons incum- 

 bent. 



9. lies peris. Flowers large, purple. Pod terete, elongated. Stigma- 



lobes narrow; erect. Cotyledons incumbent. 



10. Bras' siea. Flowers yellow. Pod linear or oblong, nearly terete, 



or 4-sided, with a distinct beak extending beyond the end of the 

 valves. Seeds usually in one row. Cotyledons conduplicate. 



11. IMpIolax is. Sepals, petals, and stamens almost as in Brassica. 



Pods slender, on slender spreading pedicels. Beak conical, 

 usually short. Seeds in two roivs. 



* * Pod dehiscent by 2 valves, comparatively short. 

 -f- Silicle compressed parallel with the broad partition or globular. 



12. Draba. Flowers white. Pod flat ; seeds several or many, 2 rows 



in each cell. Cotyledons accumbent. Low herbs. 



13. Alys sum. Flowers pale yellow or white. Pod orbicular, flat, 



2-t-seeded. 



14. Camel' iua. Flowers yellow. Pod pear-shaped, pointed; valves 



1-nerved. Cotyledons incumbent. 



