crucifer;e. (mustard family.) 25 



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

 clasping, piunatiliJ, with toothed lobes ; siiique short, ovate or oblong-ovate, 

 pointed with tiic 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 j)inn:itely divided into very numerous capillary segments, cmersed ones 

 lanceolate, serrate ; siliquc 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. oflB^cinale, R. Br. (Water-Cress.) Stems spreading and root^ 

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

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

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

 duced. 



2. lODANTHUS, Torr. & Gray. 



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

 in eacli cell, not margined. Cotyledons accunibent. Claws of the violet-purple 

 petals longer than the calyx. — A smooth j)erennial, with ovate-oblong pointed 

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

 in paniclcd racemes. 



1. I. hesperidoides, Toit. & Gray. (Ilesperis pinnatifida, Wichx.) — 

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

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



3. CARDAMINE, L. 



Siiique linear, flattened ; the valves nerveless, usually opening elastically 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 ; siiique 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 ; siiique 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. 



3 



