24 CRUCIFER^E. (MUSTARD FAMILY.) 



Synopsis. 

 I. SILIQUOS^E. Fruit a silique, few -many-seeded. 



* Cotyledons flattened, parallel with the partition, one edge applied to the ascending radicle 



(accumbent). 

 t- Valves of the fruit nerveless. 



1. NASTURTIUM. Silique short, nearly terete. Seeds in two rows in each cell. 



2. IODANTIIUS. Silique elongated, terete. Seeds in a single row in each cell. 



3. CARDAMINE. Silique linear, compressed. Seeds wingless, in a single row. 



4. DENTARIA. Silique lanceolate, compressed. Seeds wingless, in a single row. 



5. LEAVENWORTHIA. Silique oblong. Seeds winged. Embryo straight. 



- - Valves of the fruit 1-nerved. 



6. ARABIS. Silique linear, elongated : valves flattened. 



* * Cotyledons flat, with one edge turned toward the partition, and the back of one of them 



applied to the ascending radicle (incumbent). 



7. SISYMBRIUM. Silique sessile, nearly terete. 



8. WAREA. Silique stalked, compressed. Petals on long claws. 



II. SILICULOSJE. Fruit a silicic. 



* Silicle compressed parallel with the broad partition, or globular. 

 *- Cotyledons accumbent. 



9. DRABA. Silicle oval or oblong, many-seeded valves 1 - 3-nerved. 



10. YESICARIA. Silicle orbicular, few-seeded : valves nerveless. 



i- *- Cotyledons incumbent. 



11. CAMELINA. Silicle obovoid : valves 1-nerved. 



* * Silicle compressed contrary to the narrow partition. Cotyledons incumbent, rarely 



accumbent. 



12. SENEBIERA. Valves of the silicic globular, rugose : seeds' solitary. 



13. LEPIDIUM. Valves of the silicic boat-shaped : seeds solitary. 



14. CASELLA. Valves of the silicic boat-shaped : seeds numerous. 



HE. LOMENTACE2E. Fruit separating transversely into joints. 



15. CAKILE. Fruit 2-jointed. 



1. NASTURTIUM, K. Br. WATER-CRESS. 



Silique nearly terete, linear or oblong, or short and silicle-like, usually curved 

 upward ; the valves nerveless. Seeds numerous, small, in two rows in each cell, 

 not margined. Cotyledons accumbent. Herbs. Leaves $innately-lobed. Flow- 

 ers white or yellow, small. 



1. N". tanacetifolium, Hook. & Arn. Smooth; stems diffuse; leaves 

 pinnately divided, with pinnatifid or toothed lobes ; silique oblong-linear, pointed 

 with the short style, twice as long as the pedicel. (Sisymbrium, Walt. S. Wai- 

 ten, Ell.) Damp soil, East Florida to South Carolina, and westward. March 

 and April. Stems 6'- 12' long. Flowers minute, yellow. 



2. N. sessiliflorum, Nutt. Smooth ; stem stout, erect, branching ; leaves 

 oblong-obovate, pinnatifid toward the base, toothed above, obtuse ; silique linear- 

 oblong, pointed with the very short and thick style, four or five times as long as 

 the pedicel. Banks of the Apalachicola River, Florida and westward. Febru- 

 ary - April. CL) Stem 1 - 2 high. Flowers minute, yellow. 



