#6 CRUCIFER^E. (MUSTARD FAMILY.) 



1. S. OFFicixALE, Scop. (HEDGE MUSTARD.) Leaves -nnirinate; flow- 

 ers very small, pule yellow ; pods close pressed to the stem, awl-shaped, scarcely 

 stalked. (1) Waste places. May -Sept. An unsightly, branched weed, 

 2 -3 liigh. (Nat. from Eu.) 



2. S. THALIANUM, Gaud. (MOUSE-EAR CRESS.) Leaves obovate or oblong, 

 entire or barely toothed; flowers white; pods linear, somewhat 4-sided, longer 

 than the slender spreading pedicels. @ Old fields and rocks, Massachusetts 

 to Kentucky, &<. April, May. A span high, slender, branched, hairy at the 

 base. (Nat. from Eu.) 



3. S. canesceiis, Nutt. (TANSY MUSTARD.) Leaves 2-pinnati/id, the 

 diviMons small and toothed; flowers whitish or yellowish, very small ; pods in 

 long racemes, oblong or rather club-shaped, not longer than the spreading pedi- 

 cels ; seeds irregularly in 2 rows in each cell, (j) Penn. and Ohio to Wiscon- 

 sin, and southward and westward. Slender, 1 high, often hoary-pubescent. 



11. SIN APIS, Tourn. MUSTARD. 



Pod nearly terete, with a stout beak (which is either empty or 1 -seeded) ; the 

 valves 3-5- (rarely 1-) nerved. Seeds globose, one-rowed. Cotyledons incum- 

 bent, folded around the radicle. Calyx open. Annuals or biennials, with yel- 

 low flowers. Lower leaves lyrate, incised, or pinnatifid. (Greek name Su/cnri, 

 which is said to come from the Celtic nap, a turnip.) 



1. S. ALBA, L. (WHITE MUSTARD.) Pods bristly, turgid, on spreading 

 pedicels, shorter than the sword-shaped one-seeded beak; leaves all pinnatifid. 

 (Cult, and adv. from Eu.) 



2. S. ARVENSIS, L. (FIELD MUSTARD. CHARLOCK.) Pods smooth, knot- 

 ty, about thrice, the length of the conical 2-edged usually empty leak ; upper leaves 

 merely toothed. A noxious weed in cultivated fields, New York and Wiscon- 

 sin. (Adv. from Eu.) 



3. S. N!GRA, L. (BLACK MUSTARD.) Pods smooth, 4-corinrrd (tin- rulrm 

 \-nerved only), appressed, tipped with a slender persistent style (rather than beak ) ; 

 leaves lyrate or lobed, the upper narrow and entire. Fields and waste places. 

 The acrid seeds furnish the mustard of our tables, &c. (Adv. from Eu.) 



12. DRAB A, L. WHITLOW-GRASS. 



Pouch oval, oblong, or even linear, flat; the valves plane or slightly convex, 

 1-3-ncrved: partition broad. Seeds several or numerous, in 2 rows in each 

 cell, marginlcs*. Cotyledons accumbcnt. Calyx equal. Filaments not toothed. 

 Low herbs, with entire or toothed leaves, and white or yellow flowers. Pu- 

 bescence mostly stellate. (Name from 8pa/3f/, acrid, in allusion to the pungency 

 of the leaves.) 



1. DRAB A, DC. Petah undivided. 



* Perennial, tufted, leafy-stemmed: flowers white : pods twisted when ripe. 

 1. D. rnmoSiSSinia, Dcsv. Diffusely much branched (5'- 8' high), 

 pubescent ; leaves laciniate-toothed, linear-lanceolate, the lower oblanccolate ; ra- 



