CRUCIFER7E. (.MUSTARD FAMILY.) 25 



3. N. palustre, r)C Smooth or liairv ; stem erect, lirandiinj; ; leaves 

 clasping, pinnatiiid, with toothed lobes ; siliquc short, ovate or oblong-ovate, 

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

 spreading pedicel. — AVet places. North Carolina and westward. June -August 

 — Stem l°-2° higli. Flowers small, yellowish. 



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

 leaves pinnatcly divided into A'ery numerous capillary segments, emersed ones 

 lanceolate, serrate ; siliquc 1 -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, li Br (Water-Crkss.) Stems spreading and root- 

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

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

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

 duced. 



2. lODANTHUS, Torr. & Gray. 



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

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

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

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

 in ])aniclcd racemes. 



1. I. hesperidoides, Torr. & Gray. (Ilcspcris pinnatifida, ^^ich.r.) — 

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

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



3. CARDAMINE, L. 



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

 the base. Seeds several, wingless, disposed in a sint^le row in each cell, sus- 

 pended by filiform stalks. Cotyledons aeeumbent. — 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; siliquc 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 



