CBUCIFER^. (mustard FAMILY.) 27 



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

 pinnatifid, 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, Jiat, ei'ect-spreudinff ; seed winged. 



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

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

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

 around homesteads. March -May. 



* * * Silique linear, recurved-spreadiny 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, 

 I°-2° high ; lower leaves mostly toothed or pinnatifid, 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. lODANTHUS, 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-piunatifid, and showy 

 flowers in panicled racemes. 



1. I. hesperidoides, Torr. & Gray. (Hesperis pinnatifida, J/(VA.r.) — 



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



Silique 1' or more long, curving upward. 



7. BARBAREA, R. Br. 



Silique 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 pinnatifid, 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. Pube.scent; stem i°-2° high; leaves bipin- 

 uatifid, the lobes small and toothed ; silique ^' long, shorter than the spreading 

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

 May. (T)- 



