ORDER 13. THE CRUCIFERS. 



163 



stamens 6, 2 of them on opposite sides shorter than the rest ; an 



ovary of 2 united carpels, forming in fruit a 



silique or silicle, with 2 cells and few or many seeds ; 



needs 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 be needful in avoid- 

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



Fig. 393. Flower of White Mustard. Fig. 394 Same, with its parts separated. Fiff. 395. A 

 silique, ripe and open. Fig. 396. Fraba verna. Fig. 397. A pod open. 



Analysis of the Genera. 

 * Garden plants cultivated for ornament or art 



1 Fruit a silique or long pod ( 363) .... 5 



1 Fruit a silicle or short pod ( 3fi4) 2 



2 Silicle 2-celled, with 2 or more seeds 3 



2 Silicle 1-celled, with one seed only. Woad. ISA 'TO. 



8 Petals all equal 4 



8 Petals unequal, the 2 outside ones larger. Candy-tuft. IBE'RIS. 1 



4 Some of the stamens toothed. Gardens. Madicort. ALYS'SUM. 



Stamens- all toothless. Silicles very large and thin. Satin-flower. LUNA'RIA. 



5 Seeds flat. Stigma rounded or head-shaped. Wall-flower. CHEIRAN'THUS. 



5 Seeds flat. Stigmas 2-horned, spreading. Stock. MATTHI'OLA. 



5 Seeds egg-shaped. Stigma with 2 converging lobes. Rocket. HKS'PERIS. 



