28 CRUCIFERjE. 



4. D. maxima Nutt. : leaves many, alternate, on long petioles, ternate ; 

 leafets sub-oval, incisely and acutely toothed, lateral ones lobed ; axils 

 naked ; racemes lateral and terminal. 



Woods. In the western part of N. Y. and Perm. Nutt, Rare. June. 7J.. 

 Tubers concatenate. Stem sometimes nearly 2 feet high. Leaves 5 7, remote, 

 the margin a little roughened ; leafets broad. Flowers in racemes, pale purple. 



Tall Tooth-wart. 



12. BARBAREA. Brown. Winter-cress. 

 (From St. Barbara, to whom this plant was formerly dedicated.) 



Pod 4-angled and somewhat 2-edged; valves awnless at the 

 apex. Seeds in a single row. Calyx erect, equal at base. 



1. J3. vulgaris Brawn : lower leaves lyrate, the terminal lobes roundish ; 

 upper ones sessile, obovate, toothed ; pod 4-sided, tapering into a slender 

 style. Erysimum Bar bar ea Linn. 



Pastures and wet grounds. N. S. N. to the Arctic Regions. Hook. May 

 Sept. %. Stem 1 2 feet high, smooth, branched above. Flowers in dense 

 racemes, small, yellow. Bitter Winter-cress. 



2. B. prcecox Brown : lower leaves lyrate, upper ones pinnatifid ; seg- 

 ments linear-oblong, entire; pod linear, obtuse, compressed. Erysimum 

 prcBcox Smith. 



Waste grounds. Can. and Conn. Eaton. April Sept. (g). Stem 1 2 feet 

 high, more slender than the last. Flowers smaller ; pods longer. 



Early Winter-cress. 



13. ARABIS. Linn. Wall-cress. 



(.Supposed to have received this name, because originally an Arabian genus.) 

 Pod linear, plane ; valves flat, 1 -nerved in the middle. Seeds 

 in one row in each cell, oval or orbicular, compressed. Coty- 

 ledons flat, accumbent. 



1. A. sagittata D. C.: leaves subdentate, rough, with the pubescence 

 often branched ; radical ones ovate or oblong, attenuated into a petiole ; 

 cauline lanceolate, sagittate-cordate ; pedicels of the length of the calyx ; 

 pods stiffly erect. 



var. ovata D. C. : leaves rough ; radical ones ovate, toothed ; cauline 

 clasping^. A. ovata Pair. Turritis ovata Pursh. 



var. oblongata D. C. : leaves rough, radical ones ovate-oblong, toothed ; 

 cauline sagittate-amplexicaul. Turritis oblongata Raf. 



Rocks. Can. (lat. 63 N.) to Virg. W. to Oregon. (S).Stem 12^18 inches 

 high, simple. Flowers small, white. A very variable plant. 



Sagittate Watt-cress. 



2. A. hirsuta D. C. : leaves dentate, pubescent or scabrous ; radical 

 ones obovate-oblong, tapering into a petiole ; cauline ovate-lanceolate ; 

 pedicels as long as the calyx ; pod erect. Turritis hirsuta Jacq. 



Conn. Robbins. Alleghany Mountains. Hook. June. ). Stem 6 12 inches 

 high, hairy. Flowers small, white. A specimen of this plant, gathered in Con- 

 necticut by Dr. Robbins, agrees very well with the foreign one, from which it 

 teems to me our A. sagittata is quite distinct. Hairy Watt-cress 



