70 CRt'CIFERJE. (MUSTARD FAMILY.) 



on slender pedicels, linear and narrow, bringing tin- seeds into one row; style 

 very short. Wet meadows, Mass, to Y;i. ; rare. (Nat. 1'nnn Ku.) 



1. N. sinuatum, Nutt. Stems low, diffuse; leaves />in)Hitt/y cleft, the 

 short lobes nearly entire, linear-oblong; pods linear-oblong (4-6" long), on 

 slender pedicels; style slender. Banks of the Mississippi and westward. 

 June. 



* * Annual or biennial, ran ' </ />, r< nuiul (:'), id tit sinij>lc jil>rons roots; flowers 

 si/itill nr niiiinii , i/n i nislt or ij, lltudult ; leaves somewhat lyrate, 



2. N. sessilifl6ruin, Nutt. Stems erect, rather simple ; leaves obtusely 

 incised or toothed, obovate or oblong ; j!i'-< r* inumti, ;,</;/// sessik : puds 

 elongated-oblong (">-G" long), thick ; style very short. W. 111. to K. Kan., 

 Tenn., and southward. April-June. 



3. N. ObtUSUm, Nutt. Stems niueh branched, diffusely spreading; 

 leaves /liu/mti /// /.<///<</ </ divided, the di\isions roundish and obtusely toothed 

 or repand ; //"'< rs nninit, , >l.,;-t-i<i tin; II, ,1 ; j,i,,ls !<'i,;/, r tl,iiu th, jn <//-, Is, var\ - 

 ing from linear-oblong to short-oval; style short. With n. 1 and 2. 



4. K". pallistre, !'<' (.MAK-H Ci:i.--.) Stem em-t ; leaves 

 cl< /'tor par/erf, or the upper laciniate ; the li.bcs nblnng, eut-t'mthed ; 

 about as IOIM/ an tin small ////<;.< uitd niosl/y l<nuj< r t/inn the olilnn 



or nvoid pods; st\le shurt. Wet places or in shallow water; cnnmnm. 

 June-Sept. Flu\\crs only 1-1^" long. Stems l-:> liigli. The t\]>ieal 

 form with oblong pods i> HUT. Short pods and bii>ute stems and leaves are 

 common. Var. uisriDi.M is a form witli ovoid or globular pods. (Ku.) 

 3. Petals ic/u'ti , i/nic/t loin/tr limn tin i-n'i/.r ; /mils ai-nnl or globular; leaves 

 undirii/i il, or /In /mi; r tuns jxn/nitijid ; root perennial. 



5. N. lacustre, <iray. (I. \KI. < 'KI .".) Aquatic; immersed leaves 1-3- 

 piuuately dissected iuto nuuierous capillary divisions; emersrd hnves oblong, 

 entire, serrate, or jiinnatilid ; pedii-els \\ idel\ spread in g ; j.mls i^nid, \, 



a little loii'i^r tluin tin st'/I<. Lakes and rixers, X. K. New York to X. J., 

 Minn., and soutliwestward. July- Aug. Xi-ar X. amjihibiuni. 



N. Au.Moit.vci \. lii's. (II.'i^i n UIIMI.) Root-leaves verv large, oblong, 



crenate, rarely pinnatilid. those of tin- stem lanceolate; fruiting pedicels as- 

 cending; /KU/. ..loin formed); s/i/lf r, ry s/iurt. (( 'ochlearia Armo- 

 racia, /..) Hoots large and long; a well-known condiment. Escaped from 

 cultivation into moist ground. (Adv. from Ku.) 



12. BARBAREA, K. Br. WINTER CKI -. 



Pod linear, terete or somewhat 4-sided, the valves being keeled by a mid- 

 nerve. Seeds in a single row in each cell, murginless. Cotsledons accuin- 

 bent. Mostly biennials, resembling Nasturtium; nowers yellow. (Anciently 

 called the Herb of St. Barbara.) 



1. B. VUlgaris, R. BR. (COMMON WINTER CHESS. YELLOAV ROCKET.) 

 Smooth; lower leaves lyrate, the terminal division round and usually large, 

 the lateral 1-4 pairs or rarely wanting; upper leaves obovate, cut-toothed, or 

 piunatifid at the base ; pods erect or slightly spreading ; or in var. STRICTA, 

 appressed; in var. ARCH ATA, ascending on spreading pedicels. Low grounds 

 and roadsides ; apparently introduced, but indigenous from L. Superior north- 

 ward and westward. (Eu.) 



