CRUCIFER^E. 199 



I. F. OFFICINALIS (Common Fumitory}. Stem erect or decumbent, 

 branching ; leaves biternately dissected, segments linear ; flowers small, 

 rose-colored, in loose racemes. Sepals ovate-lanceolate, acute ; nut globose, 

 i etuse. June September. 



Order VIII. CRUCIFER^E. 



Herbs. Leaves alternate. Stipules none. Flowers usually 

 yellow or white, in racemes or corymbs, destitute of bracts. 

 Sepals 4, deciduous. Corolla of 4 usually regular, unguiculate 

 petals, in the form of a cross. Stamens 6, 2 shorter than the 

 other 4. Ovary consisting of 2 carpels united by a membranous 

 partition, usually a 2-celled pod, called a silique, or a silicic. 

 Seeds destitute of albumen: Embryo variously folded, with the 

 cotyledons on the radicle. 



A large, important, and very natural order, containing some 

 very beautiful and fragrant flowers. 



f Pod triangular Capsella. 

 f Pod emarginate 



at apex \ Pod orbicular Lepidium. 

 fPoda 



silicic \ [Pod truncate Iberis. 



f Pod oval or roundish Alyssum, 

 {_ Not emarginate \ 



I, Pod oblong, pedicillate Lunar ia. 



u 



f Flowers white 



! I 



Pod terete 



Pod a 

 silique 



f Valves i-nerved A rabis. 

 Pod linear 



I Valves veinless Cardamine. 



[Seeds flattish Matthiola. 

 Pod lanceolate Dentaria. 



Flowers 



Pod round 



I Valves concave Brassica. 



I yellow 



Pod f Leaves lyrately pinnatifid Barbarea. 



4-6-sided -| 



t Leaves runcinate Sisymbrium. 



I. Capsella. Silicles triangular-cuneiform, obcordate. Valves 

 wingless. Cells small, many-seeded. Style short. ) 



1. C. BURSA-PASTORIS (Shepherd' s-purse). Stem erect, branching ; radi- 

 cal leaves pinnatifid, on short petioles, growing in a fiat tuft, upper ones 

 linear-lanceolate, auriculate at base ; flowers very small, white, in long 

 racemes ; capsules obcordate, tipped with the short style. A common weed, 

 1-2 feet high. June-October. 



2. Lepidium. Sepals and petals ovate. Silicles nearly orbicular, 

 emarginate. Valves carinate, dehiscent. Cells i-seeded. 



