28 CRUCIFER^. 



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

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

 naked ; racemes lateral and terminal. 



Woods. In the vv'estem part of N. Y. and Penn. Nutt, Rare. June. '2]..— 

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

 fhe margin a little roughened ; Ieafets broad. Flowers in racemes, pale purple. 



Tall Tooih-vxrrt. 



12. -BARBAREA. i7r<W7i.— Winter-cress. 

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

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

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



1. B. vulgaris Broion : lower leaves lyrate, the terminal lobes roundish ; 

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

 style. Erysimum Barbarea 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. prcccox Brown : lower, leaves lyrate, upper ones pinnatifid ; seg- 

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

 pracoz Smith. 



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

 liigh, mort, *;knder than the last. Flowers smaller ; pods longer. 



Early Winter-cress. 



13. ARABIS. i^t?m.— Wall-cress. 

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

 Pod lioear, 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 ohlong, 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. 68° N.) to Virg. W. to Oregon. ^.—Stem 12—18 inches 

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



Sagittate Wall-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. RdMns. 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 

 seems to me our A. sagittata is quite distinct. Hairy WaUrcress 



