316 The Ohio Journal of Science [Vol. XVII, No. 8, 



Annual or biennial in wet places. Indigenous or introduced 

 from Europe. General. 



3. Radicula sylvestris (L.) Druce. Creeping Yellow-cress. 

 Stems creeping, branches ascending; leaves 3-5 in. long, petioled, 

 pinnately parted, divisions toothed or lobed, obovate or 

 lanceolate; pods linear, style short. 



A perennial in wet places, naturalized from Europe. Cuy- 

 ahoga, Erie, Lucas. 



12. Lepidium (Tourn.) L. Peppergrass. 



Erect glabrous and pubescent herbs, with entire or pin- 

 natified leaves and white flowers in racemes. Petals small 

 or wanting. Stamens 6 or 2. Silicles orbicular, dehiscent, 

 flattened contrary to the partition. Seeds 2, pendulous, 

 1 in each cavity. 



1. Stem-leaves clasping by an auricled base; stamens 6. 2. 



1. Stem-leaves not clasping by an auricled base; stamens 2. 3. 



2. vStem-leaves sagittate-clasping; pods ovate, winged; style minute. L. campestre. 

 2. Stem-leaves broadly auricled; pods broad-ovate, wingless; style conspicuous. 



L. draba. 



2. Stem-leaves oval, deeply clasping, pods orbicular. L. perfoliatum. 



3. Petals present, pods orbicular. L. virginiciim. 



3. Petals wanting or rare. 4. 



4. Plant fetid, petals none. L. riiderale. 



4. Plant scentless, petals none or very small. L. densiflorum. 



1. Lepidium ruderale L. Roadside Peppergrass. Stem 

 erect and branching, glabrous, G-15 in. high; lower leaves 1-4 

 in. long, bipinnatifid, upper leaves small, entire; pods flat, 

 oval, marginless, on slender ascending pedicels. 



An annual in w^aste places near cities, naturalized from 

 Europe. No specimens. 



2. Lepidium virginicum L. Virginia Peppergrass. Stems 

 erect, glabrous, much branched; leaves of all forms from the 

 large pinnatifid lower leaves to the linear entire form near the 

 inflorescence; lower leaves early deciduous; flowers small in 

 elongating racemes; pods flat, obscurely margined at the top. 



An indigenous annual weed. General and abundant. 



3. Lepidium densiflorum Schrad. Wild Peppergrass. 

 Resembles L. ruderale and L. virginicum. Leaves toothed 

 or pinnatifid; petals usually wanting; pods orbicular, slightly 

 winged at the top. 



An annual, more common in the West, lately introdticed 

 eastward. Auglaize, Champaign, Cuyahoga, Fayette, Frank- 

 lin, Lake, Lorain, Wayne. 



