CRUCIFEK.E. (MUSTAKD FAMILY.) 27 



4. A. lyrata, L. Smooth, branching, 4'- 10' high; radical leaves tufted, 

 piunatifid, of the stem linear, entire ; petals twice as long as the calyx ; si- 

 lique erect, pointed by the short style ; seeds not margined. Mountains of 

 North Carolina. April. 



* * Silique linear, flat, erect-spreading ; seed winged. 



5. A. Ludoviciana, Meyer. Smooth or nearly so, branching from 

 the base, 4'- 10' high ; leaves pinuately lobed, the lobes oblong or linear, 

 toothed ; flowers minute ; stigma sessile ; seeds orbicular. Waste ground 

 around homesteads. March -May. 



# * * Silique linear, recuroed-spreading or drooping ; seed broadly winged. 



6. A. Canadensis, L. Pubescent, with branching hairs; stem 2 -3 

 high, mostly simple ; leaves lanceolate, sessile, the radical pinnatifid; petals 

 exserted ; silique flat, drooping, 2' - 3' long. Dry rocky woods in the upper 

 districts. April - May. 



7. A. laevigata, DC. Smooth and glaucous; stem mostly simple, 

 l-2 high ; lower leaves mostly toothed or pinuatifid, the upper linear and 

 entire, clasping and sagittate at the base, petals slightly exserted; silique 

 3' - 4' long, recurved. Rocks along the mountains. April. 



6. IODANTHUS, Torr. & Gray. 



Silique linear, elongated, terete ; the valves nerveless. Seeds in a single 

 row in each cell, not margined. Cotyledons accumbent. Claws of the violet 

 purple petals longer than the calyx. A smooth perennial, with ovate-oblong 

 pointed and toothed leaves, the lowest sometimes lyrate-pinnatifid, and showy 

 flowers in pauicled racemes. 



1. I. hesperidoides, Torr. & Gray. (Hesperis pinnatifida, ,3/ifcA.r.) 



Banks of rivers, Tennessee, and northward. May- June Stem 1 - 3 high. 



Silique 1' or more long, curving upward. 



7. BARBAREA, H. Br. 



Siliqne long, linear, terete or 4-sided, the valves keeled. Seeds in a single 

 row in each cell, marginless. Cotyledon thick, accumbent. Biennial or per- 

 ennial herbs, with pinnatifid clasping leaves, and yellow flowers. 



1. B. vulgaris, R. Br. (SCURVY GRASS.) Lower leaves lyrate, with 

 the terminal lobe obovate, the upper ones pinuatifid, with oblong-linear lobes; 

 silique compressed, barely thicker than its pedicel; style short and thick. 

 Waste places. North Carolina. Introduced. 



8. SISYMBRIUM, L. HEDGE-MUSTARD. 



Silique linear or oblong, terete or angled, with 1 -3-nerved valves. Seeds 

 in a single row in the cells, marginless. Cotyledons incumbent. Herbs, 

 with simple or pinnately divided leaves, and small white or yellow flowers. 



1. S. canescens, Nutt. Pubescent; stem |-2 high; leaves bipin- 

 natifid, the lobes small and toothed ; silique long, shorter than the spreading 

 pedicel; petals barely exserted, greenish yellow. Fallow ground. March - 

 Mav. - 



