Order 13.— CRUCIFER^B. 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 lvs., incised, those of the branches linear, entire ; Jh- 

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

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

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

 species. 



3 L. campestre R. Br. Yellow-seed. Cauline lvs. sagittate, denticulate ; silicles 

 ovate, emarginate, scaly, punctate. — :T) 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. Lvs. variously divided and cut; branches without 

 spines; silicles broadly oval, winged. — (D 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 Sencbier, a distinguished vegetable physiologist.) Silicic didymous, 

 with the partition very narrow ; valves ventricous, separating but 

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

 selves. — ® or <D 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. 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 tubercled, not notched at apex. — Waste grounds, Va. and Car. (Pursh), R. IsL 

 (Robbins). Not common. § Eur. 



28. ISATIS, L. Woad. (Gr. lad^o), 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. tinctdria L. Silicles cuneate, acuminate at base, somewhat spatulate at the 

 end, very obtuse, 3 times as long as broad. — (1) 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. J 



29. CAKILE, Tourn. Sea Rocket. (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 tho 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. 

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

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

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



