OifflBB 13.— CRUCIFERjE. 239 



hi^. Lvs. 1 — 2' by 1 — 3", acute, tapering at base into a petiole, upp« ones 

 sesale, lower pinnatifidly out. Pis. and silioleB veiy numerous, in a panicle of 

 racemes. Fls. very small, mostly diandrons ; silloles 1 J" diam., with a notch at 

 the ond. Taste pungent, like that of the garden peppergrass. Jn. — Oct 



2 L. ruderi.le L. Cavline lvs., incised, those of the branches linear, entire ; fla- 

 apetalous, and with but two stamens ; silioles broadly oval, emarginate, winglesa- 

 Dry fields, Mich., Ind., Mo. St. 10 — 15' high, diffusedly branched. Rac. many, 

 ils. remarkable for wanting the petals, which are always present in our other 

 species. 



3 la. campestre R. Br. Tbllow-sbed. CauUne lvs. sagittate, denticulate ; silicles 

 ovate, emarginate, scaly, punctate. — (I) In waste places and dry fields, especially 

 among flaz. St. strictly erect, round-, minutely downy, 6 — 10' high, branching. 

 Lvs. 1' long, 4" as wide, with two lobes at base, upper one clasping the stem, all 

 minutely velvety. Pis. small. SUicles 1 J" long, . numerous, in long racemes. 

 .Jn., Jl. § Eur. 



4 Ii. aativum L. Pbppeegeass. Lvs. variously divided and cut ; branches without 

 spines ; silicles broadly oval, winged. — J) Native of the East. Sts. 1 — 3f high, 

 very branching. Silicles 2 — 3" broad, very numerous. A well known garden 

 salad. Jl. t § 



27. SENE6IERA, Poir. Carpet Cress. Swine Cress. (In honor 

 of Senebier, a distinguislied vegetable physiologist.) Silicic didymous, 

 with the partition very narrow ; valves ventricous, separating but 

 indehiscent, and each 1-seeded, cotyledons incumbently folded on them- 

 selves. — (D or © Prostrate and diffuse, with minute white fls. 



1 S. didyma Pers. Lvs. pinnate, with pinnatifid segments; silicles rugously reticu- 

 lated, notched at the apex. — "Waste places and waysides, southern States, common. 

 Sts. spreading circularly like the carpet weed (Molugo), flat on the ground. Lvs. 

 1 — 3' long, oblong in outline, its lobes obtuse, and cleft mostly on the upper 

 margin. Pis. minute. Silicles very small, apparently doubled^ rough- wrinkled. 

 Peb. — Jn. 



2 S. corondpus DC. Lvs. pinnate, with the segm. entire, toothed, or pinnatifid ; 

 silicles iuherded, notnotclied ai apex. — Waste grounds, Va. and Car. (Pursh), R. Isl. 

 (Robbins). Not common. § Elir. 



28. ISATIS, L. Woad. (Gr. ludi^u, to make equal ; supposed to 

 remove roughness from the skin.) Silicle elliptical, flat, 1-celled (dis- 

 sepiment obliterated), 1-seeded, with carinate, boat-shaped valves, which 

 are scarcely dehiscent (0||). None of the species are N. American. 



I. tinctoria L. Silioles cnneate, acuminate at base, somewhat spatulate at the 

 end, very obtuse, 3 times as long as broad. — Q The Woad is native of England. 

 It is occasionally cultivated for the sake of its leaves, which yield a dye that 

 may be substituted for Indigo. The plant grows about 4f high, -mtli large 

 leaves clasping the stem with their broad bases. Pis. yellow, lafge, hi terminal 

 racemes. May — JL X 



29. CAKiLE, Tourn. Sea Eocket. (Named from the Arabic.) 

 Silicle 2-jointed, the upper part ovate or ensiform ; seed in the upper 

 cell erect, in the lower pendulous, sometimes abortive. — (D Maritime 

 herbs. 



C. maritima Scop. . Upper joint of the silicle ensiform or ovate-ensiform. — Native 

 of the seacoast and lake shores, N. States. A smooth, succulent plant, branching 

 and procumbent, 6 — 12' long. Lvs. sinuate-dentate, oblong-ensiform, caducous. 

 Pis. on short, fleshy peduncles, in terminal spikes or racemes, corymbously 

 arranged. Petals purple, obtuse at end. Silicle smooth, roundish, lower joint 

 elavate-obovate, upper with one elevated line on each side. JL, Aug: 



