CRUCIFER^E. (MUSTARD FAMILY.) 25 



3. N. palustre, DC. Smooth or hairy ; stem erect, branching ; leaves 

 clasping, pinnatifid, with toothed lobes ; silique short, ovate or oblong-ovate, 

 pointed with the distinct and rather slender style, barely half as long as the 

 spreading pedicel. Wet places, North Carolina and westward. June -August. 

 Stem l-2 high. Flowers small, yellowish. 



4. "N. lacustre, Gray. Smooth ; stem sparingly branched ; immersed 

 leaves pinnately divided into very numerous capillary segments, emersed ones 

 lanceolate, serrate ; silique 1 -celled, obovate, pointed with the slender style, shorter 

 than the spreading pedicel. Rivers and cool springs, West Florida, thence 

 northward and westward. July. Stem l-3 long. Flowers conspicuous, 

 white. 



5. ]N". officinale, R. Br. (WATER-CRESS.) Stems spreading and root- 

 ing ; leaves pinnate, with the leaflets roundish or oblong and nearly entire ; 

 silique linear (6'' -8" long), on slender spreading pedicels; petals white, 

 twice the length of the calyx. Ditches, &c., Florida and northward. Intro- 

 duced. 



2. IODANTHUS, Torr. & Gray. 



Silique linear, elongated, terete ; the valves nerveless. Seeds in a single row 

 in each cell, not margined. Cotyledons accumbent. Claws of the violet-purple 

 petals longer than the calyx. A smooth perennial, with ovate-oblong pointed 

 and toothed leaves, the lowest sometimes lyrate-pinnatifid, and showy flowers 

 in panicled racemes. 



1. I. hesperidoides, Torr. & Gray. (Hespcris pinnatifida, Mchx.) 

 Banks of rivers, Tennessee and northward. May and June. Stem l-3 

 high. Pods 1' or more long, curving upward. 



3. CABDAMINE, L. 



Silique linear, flattened ; the valves nerveless, usually opening clastically from 

 the base. Seeds several, wingless, disposed in a single row in each cell, sus- 

 pended by filiform stalks. Cotyledons accumbent. Herbs. Leaves often un- 

 divided, Flowers purple or white. 



* Perennials. 



1. C. rotundifolia, DC. Smooth; root fibrous; stem erect, simple, 

 soon bearing from the root or upper axils long and leafy runners ; leaves oval 

 or orbicular, often cordate, wavy or toothed, the lowest long-petioled and some- 

 times sparingly pinnatifid ; silique subulate, spreading ; seeds oval. Cool 

 springs, in the upper districts and northward. May and June. Stem 6' -12' 

 high. Runners at length 2 - 3 long. Flowers conspicuous, white. 



2. C. rhomboidea, DC. Smooth ; root tuberous ; stem simple, erect, 

 without runners ; leaves long-petioled, round-cordate, with wavy margins ; the 

 uppermost oblong-ovate, toothed, sessile ; silique linear-lanceolate, pointed with 

 the slender style; seeds round-oval. Cool springs, West Florida and north- 

 ward. April and May. Stem 12'- 18' high. Flowers white, larger than in 

 No. 1. 



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