Order 13.— THE CRUCIFERS. 



163 



stamens 6, 2 of tlicm on opposite sides shorter tlian tlie rest ; an 



omry of 2 united carpels, forming in fruit a 



dlique or silide, with 2 cella and few or many seeds ; 



seeds without albumen, the large embryo variously bent and folded. 



Note.— Under this large Order, as under others, we present to our young readers a complete 

 analysis, by which they may trace to its genus any Mustardwort growing in the United States. 

 But as the genera are so nearly alike, great care and close observation will he needful in avoid- 

 ing mistakes. The plants for examination must he in fruit as well as in flower. 



Fig. 393. Flower of "White Mustard. Fig. 304. Same, with its parts separated. Fig. 395. A 

 Bilique, ripe and open. Fig. 396. Draba verna. Fig. 397. A pod open. 



Analysis of the Genera. 

 * Garden plants cultivated for ornament or art. 



1 Fruit a silique or long pod (§ 3fi3) 5 



1 Fruit a silicle or short pod (§ 3()4) 2 



2 Silicle 2-celled, with 2 or more secd.s. , . .3 

 2 Silicle 1-celled, with one seed only. 



3 Petals all equal 4 



3 Petals unequal, the 2 outside ones larger, 

 4 Some of the stamens toothed. Gardens. 

 4 Stamens all toothless. Silicles very large and thin 



5 Seeds flat. Stigma rounded or head-shaped, 



6 Seeds flat. Stigmas 2-horned, spreading. 



Woad. Isa'tia, 



Candy-tuft. Ibf/ris, 

 Madwort. ALYS''suii, 

 Satin-flower. Lun.^'ri.v, 

 Wull-floiver. Chkikan'tiil-s, 

 ^tock. Mattiii'ola. 

 5 Seeds egg-shaped. Stignaa witli 2 converging lobes. Rocket. IIks'i'sris 



