324 The Ohio Joimial of Science [Vol. XVII, No. 8, 



and glaucous, pubescent below; basal leaves 2-10 in. long, 

 oblanceolate, coarsely dentate or lyrate; stem-leaves smaller, 

 lanceolate, usually entire, with a sagittate base; petals little 

 longer than the sepals; pods linear, 2-3 in. long, erect and 

 appressed; seeds marginless, in 1 row in each cavity. 



A biennial in fields and rocky places, perhaps indigenous. 

 Auglaize, Belmont, Cuyahoga, Franklin, Geauga, Hamilton, 

 Lucas, Richland. 



5. Arabis laevigata (Muhl.) Poir. Smooth Rock-cress. 

 Stems erect, 1-3 ft. high, glabrous and glaucous, nearly simple; 

 basal leaves 2-3 in. long, obovate, dentate, rarely lyrate; stem- 

 leaves sessile, lanceolate to linear, entire or few-toothed, clasping 

 by an auricled base; pods 3-4 in. long, recurved-spreading; 

 seeds winged, in 1 row in each cavity. 



An indigenous biennial in rocky woods. General. 



6. Arabis canadensis L. Sickle-pod Rock-cress. Stems 

 erect, simple, 1-3 ft. high, smooth above; basal leaves 3-7 in. 

 long, dentate, narrowed into a petiole, early withering; stem- 

 leaves sessile, pubescent, lanceolate, pointed at each end, 

 toothed or entire; pods flat, 2-3^ in. long, scythe-shaped, 

 pendulous on hairy pedicels; seeds winged, in 1 row in each 

 cavity. 



An indigenous biennial in woods and ravines. General. 



7. Arabis virginica (L.) Trel. Virginia Rock-cress. Stems 

 low, diffuse, 6-12 in. long; leaves pinnatifid, 1-3 in. long; flowers 

 very small; pods linear, ascending; seeds orbicular, winged, 

 in 1 row in each cavity. 



Indigenous in open situations. Clark, Clermont, Lawrence. 



8. Arabis lyrata L. Lyre-leaf Rock-cress. Stems tufted, 

 erect, 4-12 in. high; basal leaves lyrate, 1-2 in. long; stem-leaves 

 spatulate or linear, entire or toothed, scattered; petals much 

 longer than the calyx; pods linear, ascending; seeds wingless, 

 in 1 row in each cavity. 



An indigenous biennial in rocky places. Auglaize, Erie, 

 Muskingum, Pike, Wood. 



9. Arabis drummondii Gr. Drummond's Rock-cress. Stems 

 erect, |-3 ft. tall, glabrous, somewhat glaucous; basal leaves 

 rosulate, oblanceolate, dentate or entire narrowed into a long 

 petiole; stem-leaves sagittate-lanceolate, erect, entire; flowers 

 pink-purple or white; pods blunt, 2-4 in. long; seeds winged, 

 in 2 rows in each cavity. 



An indigenous biennial in rocky places. No specimens. 



