18. LUNARIA, L. Honesty. (Laf. luna, the moon; from the broad, round silicles.) Sepals somewhat bisaccate at base; petals nearly entire; stamens without teeth; silicle pedicellate, elliptical or lanceolate, with flat valves; funiculus adhering to the dissepiment (0 = ).

1 L. rediviva L. Perennial Satin Flower. St. erect, branching; lvs. ovate, cordate, petiolate, mucronately serrate; silicles lanceolate, narrowed at each end.-Crucifeeae Crucifers Part 7 279 From Germany. Stem 2 - 3f high. Fls. light purple. Jn.†

2 L. biennis DC. Honesty. St. erect; lvs. with obtuse teeth; silicles oval, obtuse at both ends. -Crucifeeae Crucifers Part 7 280 These are large, hairy plants, native of Germany. Sts. 3 - 4f high. Lvs. cordate. Fls. lilac-colored. The broad, round, silvery silicles are the most remarkable feature of the plants. May, Jn.†

19. DRABA, L. Whitlow Grass. (Gr.Crucifeeae Crucifers Part 7 281 acrid, biting; from the taste of the plant.) Calyx equal at base; petals equal; filaments without teeth; silicle oval or oblong, entire, the valves flat or slightly convex, veined; seeds not margined, 2-rowed in each cell (0=). - Fls. white, rarely yellow. Plants small.

S Erophila (DC). Petals 2-parted........................................

.. No. 1

§ Duaba proper. Petals entire or only emarginate. (a)

a Style long or short, but distinct. Plants perennial...........................

Nos. 2, 3

a Style none Plants annual or biennial. (b)

b Pedicel as long as or longer than the silicle...........................

Nos. 4, 5

b Pedicel shorter than the silicle................................

Nos. 6, 7

1 D. (Erophila) verna L Whitlow Grass. Scape naked; lvs. oblong, acute, subserrate, hairy; petals bifid; stig. sessile; silicle oval, flat, shorter than the pedicel.-Crucifeeae Crucifers Part 7 282 A little, early-flowering plant in grassy fields, rather rare, Can. to Va. Lvs. all radical, lanceolate, 1/2 - 1 1/4' long, 1/8 as wide, with a few teeth towards the end. Scape a few inches high, with a rac. of 5 - 15 small, white flowers. Cal. spreading. Petals cleft half way down. Silicles about a line wide 3" long, with deciduous valves. Apr., May.

2 D. arabisans Mx. St. leafy, erectly branched, pubescent; lvs. lanceolate, minutely dentate; silicle oblong-lanceolate, smooth, longer than the pedicel; sty. short but distinct. - Lake shores, Willoughby, Vt., N. Y., Mich. Sts. several from the same root, 6 - 8' high. Radical lvs. about 1' long, forming rosulate tufts at the top of the short radical shoots; cauline somewhat clasping. Fls. white, in a short raceme. Silicles elongated (4 - 6"), twisted when ripe so as to appear double. May.

3 D. ramosissima Desv. Minutely pubescent; sts. numerous; lvs. linear-lanceolate, with remote and slender teeth, upper ones entire; rac. corymbously paniculate; silicle lanceolate, about the length of the pedicel, the style half as long. - On rocks, Harper's Ferry, Va., W. to Ky. Sts. slender, 4 - 10' long, the barren ones with tufted leaves at top. Lvs. about 1' long, with one or two teeth on each side. Fls. white. Silicles 3" in length, ascending. Apr., May.

4 D. nemoralis Ehrh. St. pubescent, branched; lvs. oval, cauline, lanceolate, toothed; pet. emarginate; silicles oblong-elliptical, half the length of the pedicels; seeds nearly 30. - Mich., Mo. Plant slender, 8 - 10' high. St. with a few branches. Lvs. mostly radical. Rac. much elongated in fruit, with very long pedicels. Fls. minute, yellowish-white. May.

5 D. brachycarpa Nutt. Minutely pubescent; radical lvs. roundish-ovate, petiolate, cauline oblong or linear, slightly dentate or entire; rac. many-flowered, straight, elongated in fruit; petals obovate, entire; silicle oval, glabrous, about as long as the pedicels, 10 - 12-seeded.-Crucifeeae Crucifers Part 7 283 Grassy places near St. Louis, S. to La.

St. branched and leafy, 2 - 4' high. Silicles scarcely 2" in length. Mar., Apr.

6 D. cuneifolia Nutt. Hirsute, pubescent; st. branching and leafy below, naked above; lvs. cuneate-oblong, sessile, denticulate; rac. elongated in fruit; silicles twice longer than the pedicels, 20 - 30-seeded. - Fields, Ky. to La. Plant 3 - 8' high. Fls. much larger than in the preceding. Petals white, nearly thrice longer than the sepals. Mar., Apr.

7 D. Caroliniana Walt. Lvs. ovate-roundish, entire, hispid; silicles linear, smooth, longer than the pedicels, corymbous, 30 - 40-seeded. - Sandy fields, Ct.,

R. I., S. to Ga. St. 1 - 3' high, leafy at base, hispid, naked and smooth above. Lvs. clustered on the lower part of the stem, very hairy. Petals white, twice as long as the sepals. Silicle 6" long, rather obtuse, smooth (or minutely hispid in β?). Apr. - Jn. (D. micrantha Nutt.)

20. ARMORACIA, Rupp. Horse Radish. (Armorica, its native country, now the province Brittany, France.) Calyx equal at base, spreading; petals entire, much exceeding the calyx; filaments toothless; silicles ellipsoid or globular, turgid, 1-celled from the incomplete partition; style distinct; seeds few (0=).-Crucifeeae Crucifers Part 7 284 Lvs. oblong, undivided, or the lower pinnatifid. Fls. white.

1 A. rusticana Rupp. Radical lvs. oblong, crenate; cauline long, lanceolale, dentate or incised, sessile; silicle roundish, ellipsoid, much longer than the style. -Crucifeeae Crucifers Part 7 285 A common garden herb, sparingly naturalized in wet grounds. Rt. fleshy, large, white, very acrid. St 2 - 3f high, angular, smooth, branching. Radical

. lvs. near a foot long, 1/2 as wide, on long channeled petioles. Lower stetn-lvs. often cut in a pinnatifid manner, upper toothed or entire. Fls. not large. Silicle much shorter than the spreading pedicels. The root is a well known condiment for roast beef and other viands. Jn. § Eur. (Cochlearia L.)

2 A. Americana Arn. Aquatic; immersed leaves doubly pinnatifid with capillary segments, emersed oblong, pinnatifid, serrate or entire; silicle ovoid, little longer than the style. - Lakes and rivers, Can., N. Y. to Ky. Fls. not large (4" broad). Silicle 2" long, on long spreading pedicels, much as in No. 1. (Nasturtium lacustre Gray. N. natans β. Americanum ejusd. Cochlearia aquatica Eaton?)