ORDER 13. CRUCIFERJ3. 239 



high. Lvs. 1 2' by 1 3", acute, tapering at base into a petiole, upper ones 

 sessile, lower pinnatifidly cut. Fls. and silicles very numerous, in a panicle of 

 racemes. Fls. very small, mostly diandrous; silicles 1" diam., with a notch at 

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



2 L. ruderale L. Cauline Ivs., incised, those of the branches linear, entire ; fls- 

 apetalous, and with but two stamens ; silicles broadly oval, emarginate, wingless. 

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

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

 species. 



3 L. campestre R. Br. YELLOW-SEED. Cauline Ivs. sagittate, denticulate ; silicles 

 ovate, emarginate, scaly, punctate. In waste places and dry fields, especially 

 among flax. St. strictly erect, round, minutely downy, 6 10' high, branching. 

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

 minutely velvety. Fls. small Silicles 1" long, numerous, in long racemes. 

 Jn., Jl. Eur. 



4 L. sativum L. PEPPERGRASS. Los. variously divided and cut] branches without 

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

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

 salad. JL $ 



27. SENEBIERA, Poir. CARPET CRESS. SWINE CRESS. (In honor 

 of Scnebier, a distinguished vegetable physiologist.) Silicle didymous, 

 with the partition very narrow ; valves ventricous, separating but 

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

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



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

 lated, iiotched 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. Fls. minute. Silicles very small, apparently doubled, rough-wrinkled. 

 Feb. Jn. 



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

 silicles tuberckd, not notched at apex. "Waste grounds, Va. and Car. (Pursh), R. Isl. 

 (Robbins). Not common. Eur. 



28. ISATIS, L. Wo AD. (Gr. iodfa, 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. Silicles cuneate, acuminate at base, somewhat spatulate at the 

 end, very obtuse, 3 times as long as broad. CD 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, with large 

 leaves clasping the stem with their broad bases. Fls. yellow, large, in terminal 

 racemes. May JL \ 



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. Maritime 

 herbs. 



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

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

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

 Fls. on short, fleshy peduncles, in terminal spikes or racemes, corymbouslv 

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

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



