June, 1917] The Brassicacece of Ohio 317 



4. Lepidium draba L. Hoary Peppergrass. Stems erect, 

 hoary, branching, 10-18 m. high; leaves oblong, irregularly 

 dentate, 1^-2 in. long, the lower petioled, the upper auricle- 

 clasping; flowers corymbose; pods ovate or cordate, style as 

 long as the pod. 



Perennial in waste grounds. Fugitive from Europe. Lucas 

 County. 



5. Lepidium campestre ih.) R. Br. Field Peppergrass. 

 Stem erect, hoary-pubescent, with scale-like hairs, branching 

 above, 10-18 in. high; basal leaves 2-3 in. long, spatulate, 

 tapering to a petiole, entire or lobed, somewhat rosulate at 

 first; stem leaves crowded, lanceolate, obtuse; pods winged 

 at the apex, rough. 



An annual or biennial weed in fields and on roadsides, 

 naturalized from Europe. Rather general. 



G. Lepidium perfoliatum L. Perfoliate Peppergrass. Stem 

 branching, erect, 1 ft. high; basal and lower leaves finely 

 pinnatifid, upper leaves oval, entire, deeply clasping around the 

 stem; pods round, on slender, spreading pedicels. 



Fugitive from Europe. Portage County. 



13. Carara Medic. Wart-cress. 



Annual or biennial, diffuse, spreading, fetid herbs, with 

 pinnatifid leaves and small whitish fiowers in axillary and 

 terminal racemes. Stamens sometimes only 2. Silicles small, 

 didymous, tuberculate or rugose, indehiscent. Seeds 1 in each 

 cavity. 



1. Carara didyma (L.) Britt. Lesser Wart-cress. Stems 

 tufted, slightly pubescent, branching, 2-15 in. long, prostrate; 

 leaves deeply pinnatifid, lower petioled, upper sessile; pods 

 didymous, notched at apex, rugose, separating into 2 ovoid 

 nutlets. 



A weed in waste places, introduced from Europe. Lake 

 County. 



14. Thlaspi (Tourn.) L. Penny-cress. 



Low winter annuals with rosulate basal leaves, auriculate- 

 clasping stem-leaves, and small w^hite or purplish flowers in 

 panicled racemes. Silicles orbicular, obcordate, winged, flat- 

 tened contrary to the partition. Seeds 2-8 in each cavity, 

 wingless. 



1. Lower stem-leaves not clasping; pods large. T. arvense. 

 1. All the stem-leaves clasping; pods small. T. perfoliatum. 



