CRUCIKKRjE. (mustard family.) 25 



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

 clasping, pinnatifid, with toothed lohes ; siliquo short, ovate or ohlong-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 1° - 2° high. Flowers small, yellowish. 



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

 leaves pinnately divided into very numerous capillary segments, emerged ones 

 lanceolate, serrate ; silique I -celled, ohovate, 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 ohlong 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 accumhent. 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 paniclcd racemes. 



1. I. hesperidoides, Torr. & Gray. (Hesperis pinnatifida, Michx.) — 

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

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



3. CARDAMHSTE, L. 



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

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

 pended hy filiform stalks. Cotyledons accunibent. — 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 0'- 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 

 Xo. 1 . 



3 



