54 CLASS XV. ORDER II. 



emargiriate, cordate, many-seeded : valves carinate, par- 

 tition contrary. 



Thlaspi. Calyx spreading : silicle emarginatc, obcor- 

 date, many-seeded ; valves resemble 2 boats with the 

 keels outward. 

 * Sisymbrium. 



ORDER II. SILIOJJOSA. 



A. Calyx leaves converging or closed dpon the corols, when 

 thejlowers are mature. 



Gratis. Glands 4, one within each leafet of the calyx, 

 of the size of the reflected scale : siiique compressed, 

 torulose, sub-divaricate. 



Turritis. Calyx converging, erect : corol erect : sili- 

 que very long, angled, striate. 



Hesperis. Calyx closed, shorter than the claws of the 

 petals : petals bent obliquely, linear or obovate : siiique 

 sub-terete : stigma forked, with converging apexes. 



Brassica. Calyx erect, converging : partition extend- 

 ing beyond the valves of the siiique : seed globose : glands 

 between the short stamens and pistil, and between the 

 long stamens and calyx. 



Raphanus. Calyx closed, setose : siiique torose, some- 

 what jointed, terete, not opening by valves, 1 or 2-cell- 

 ed : glands between the short stamens and pistil, and 

 between the long stamens and calyx. 



Cheiranthus. Calyx closed, two of the leafets gibbous 

 at the base : petals dilated : siiique when young with a 

 glandular tooth each side : stigma 2-lobed : seed flat. 



B. Calyx-leaves spread, not lying closed upon the corol 

 when the flowers are mature. 



Cardamine. Calyx-leaves spreading but little : stig- 

 ma entire : a single gland between each of the short sta- 

 mens arid the calyx : siiique long, bursting elastically 

 with re volute valves. 



Sisymbrium. Calyx and corol spreading : siiique 

 bursting, with a short terete beak, valves straitish. 



Sinapis. Calyx spreading : corol with strait claws : 

 glands between the short stamens and pistil, and between 

 th* Jong stamen* and calyx : partition extending beyond 

 the valves oi the siiique, ensiform. 



