132 PRACTICAL BOTANY. 



Valves nerveless. Silicle globular, inflated, 2- to 4- 

 seeded. Cotyl. (0=). Leaves elliptical, entire, sessile. 



Vesicaria Shortii, Torr. 



114. Seeds several in each cell. Cotyl. (0||). Silicle 

 cordate-triangular. Valves boat-shaped. Radical leaves 

 clustered, pinnatifid, or toothed ; stem-leaves sagittate, 

 sessile. Capsella Btirsa-pastoris, Moench. 



Seeds only 2, one in each cell 115 



115. Silicles oval-orbicular, emarginate at the top. 

 Valves keeled, dehiscent. Seeds pendulous. Cotyl. (0||), 

 or in some species (0=). Stamens sometimes 2 only. 

 Flowers white, small, often incomplete. Petals rarely none. 



(100) Lepidiuiu (674). 



Silicles emarginate at the top and at the base, al- 

 most 2-tubercled. Valves ventricose, indehiscent, separat- 

 ing from the partition, when ripe, as 2, closed, 1-seeded 

 nutlets. Cotyledons incumbently folded on themselves. 



Senebiera (689). 



116. Seeds in a double row in each cell. Cotyl. (0=). 



117 

 Seeds in a single row in each cell 118 



117. Valves nerveless. Siliques nearly terete, general- 

 ly curved upward ; sometimes shortened, so as to resemble 

 a silicle. Seed lenticular. Leaves pinnate or pinnatifid. 



(112) Nasturtium. 

 Valves 1-nerved. Silique long, linear, 2-edged. 

 Seeds in some species margined. Stem-leaves mostly sagit- 

 tate-clasping. Turritis. 



118. Corolla purple, rose-color, or white 119 



' Corolla yellow, or, in one genus, yellow toward the 

 "base only, the upper part being purplish 122 



119. Valves 1-nerved in the middle, or longitudinally 

 veiny. Seeds mostly winged. Cotyledons accumbent or 

 oblique. Stem-leaves simple, or pinnately parted. Siliques 

 often curved. Arabis. 



Valves nerveless. Seeds not winged. 120 



