CRUCIFER^L 29 



4. D. iieterophylla, Nutt. Dwarf Toothwort. 



Radical leaves on long petioles, deeply and obtusely lobed, lobes crenately den- 

 tate, with abruptly inucronate toetb ; stem leaves 2, rarely 3, alternate, petiolate, 

 temately divided; segments linear-lanceolate, entire or rarely toothed, rough- 

 edged. 



Woods. June. Hoot-stock moniliform, obscurely toothed. Stem 8 to 12 inches 

 high. Corymbs with about 9 pale purple flowers. 



12. BARBAREA. R. Brown. Winter Cress. 



Anciently called the Kerb of Saint Barbarea. 



Sepals erect, sub-equal at base. Pod 4-angled and some- 

 what 2-edged ; valves concave-carinate, awnless at the apex. 

 Seeds in a single row in each cell, marginless. — Pcrenniah 

 err biennials with yellow flowers, and lyrately pinnatifid leaves. 



B. vulgaris. R. Br. Winter Cress. 



Smooth; lower leaves lyrate, the terminal division round ; upper leaves obovate ; 

 cut toothed, or pinnatifid at the base ; pod 4-sided, tapering into a slender style. 



Moist places an 1 roadsides, Common. May — Aug. Per. Stem 1 to 2 feet high, 

 smooth, branched above. Flowers in dense racemes, small yellow. Probably 

 introduced. 



13. NASTURTIUM. R. Brown. Cress. 



Lai. nasits tortus, from the effect of these acrimonious plants upon the nose. 



Sepals erect, sub-equal at base. Pod 4-angled and some- 

 what 2-edged ; valves concave-carinate, awnless at the apex. 

 Seeds in a single row in each cell, marginless. — Perennials 

 or biennials with yellow flowers , and lyrately-pinnatifid leaves. 



1. N. PALU3TRE, DC. Marsh Water Cress. 



Lowrr leaves lyrately pinnatifid; upper ones pinnately lobed, amplexicaul, lobes 

 confluent, dentate, smooth; petals as long as the calyx: pjods ovoid-oblong varying 

 to ovoid, obtuse, turgid, tipped with a very short stylo. 



Wet places , along streams. July. Stem 18 inches high, mostly erect, branched, 

 ohtusel; and striate above. I* rees 2 to :; inches lonsr, more or less pin- 



natifi 1, sm . >th. except a few cilia at thu ba<e. Flowers ra^emole, minute, yelk w 

 Pod short, V\. 



2. N. hispidum, DC. Hisped Water Cress. 



Stem upright, rough-hairy; leaves pinnatifidly lobed, or runcinate-pinnatifid; 

 fc&es rather obtusely toothed; pad ovoid, tumid, pointed with the distinct style, 



scarcely more than half as long as the calyx ; petals scarcely as long as the calyx. 

 Banks of streams. July, August. Stem angular, 2 to 4 feet high, much 

 branched, with many paniculate racemes above. Leaves 3 to 6 inches long. 

 Flowers minute, yellow. Silicles 1 line long on pedicels twice their length. 



3. N. SYLVESTRE, Br. Creeping Water Cress. 



Leaves pinnately divided ; segments lanceolate, incisely serrate, the upper ones 



entire ; petals longer than the calyx ; pods oblong, slightly uneven ; style very short. 



Banks of the Delaware near Philadelphia. July. Root creeping. Stem a fcot 



