36 crucifekjE. (mustard family.) 



1. ij> officinIle, Scop. (Hedge Mustard.) Leaves rumcinate; flow- 

 ers yeiy small, pale yellow ; pods close pressed to the stem, awl-shaped, scarcely 

 stalked. ® — Waste places. May-Sept. — An unsightly, branched weed, 

 2° -3° liigh. (Nat. from Eu.) 



2. S. ThaliXnum, Gaud. (Mouse-eak Ckess.) Leaves obovate or dbhng, 

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

 than the slender spreading pedicels. @ — Old fields and rocks. New York 

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

 base. (Nat. from Eu.) 



3. S. canesccns, Nutt. (Tansy Mustard.) Leaves 2-pinna(ifid, the 

 divisions small and toothed ; flowers whitish or yellowish, veiy 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, Toum. Mustakd. 



Pod nearly terete, with a short 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 SiVaTri, 

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



1. S. iLEA, L. (White Mustard.) Pods hristly, tnrgid, 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 beak ; upper leaves 

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

 sin. (Adv. from Eu.) 



3. S. NIGRA, L. (Black Mustard.) Pods smooth, i-comered {the valves 

 l^erved only), appressed, tipped with a slender persistent style (rather than beak) ; 

 leaves lyrate or lobcd, the upper naiTOw and entire. — Fields and waste places. 

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



12. I>RABA, L. Whitlow-Grass. 



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

 1 - 3-nerved : partition broad. Seeds several or mimerous, in 2 rows in each 

 cell, marginless. Cotyledons aecumbent. Calyx equal. Filaments not toothed. 

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

 bescence mostly stellate. (Name from 8pd(3i;, acrid, in allusion to the pungency 

 of the leaves.) 



§ 1. DEABA, DC — Petals undivided. 

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



1. D. ramosissima, Desv. Diffusely much branched (5'-8' high), 

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



