72 crucifer^:. (mustard family.) 



5. D. nemordsa, L. Leaves oblong or somewhat lanceolate, more or less 

 toothed ; racemes elongated (4'- 8' long in fruit) ; petals emarginate, small ; pods 

 elliptical-oblong, half the length of the horizontal or widely -spreading pedicels, pubes- 

 cent (D. nemoralis, Ehrh.), or smooth (D. liitea, DC). — Fort Gratiot, Michi- 

 gan, and nortlrwestward. (Eu.) 



6. D. cuneifolia, Nutt. Leaves obovate, wedge-shaped, or the lowest 

 spatulate, toothed; raceme somewhat elongated in fruit (l'-3'), at length equal- 

 ling the naked peduncle ; petals emarginate, much longer than the calyx ; pods 

 oblong -linear, minutely hairy, longer than the horizontal pedicels. — Grassy places, 

 Illinois, Kentucky, and southward. March, April. 



7. D. Caroliniana, Walt. Small (1'- 5' high); leaves obovate, mostly 

 entire ; peduncles scape-like ; petals usually twice the length of the calyx ; ra- 

 ceme short or corymbose in fruit (^'-1' long) ; pods broadly linear, smooth, much 

 longer than the ascending pedicels. — Sandy and waste fields, Rhode Island to 

 Wisconsin, and southward. March -May. — Petals often wanting in the later 

 racemes, especially in the 



Var. micrantha (D. micrantha, Nutt.), with minutely rough-hairy pods. 

 With the other, westward, Bebb, &c. 



§2. EROPHILA, DC. Petals 2-cleft. {Annual or biennial : flowers white.) 



8. D. verna, L. (Whitlow-Grass.) Small (scapes 1'- 3' high) ; leaves 

 all radical, oblong or lanceolate ; racemes elongated in fruit ; pods varying from 

 round-oval to oblong-lanceolate, smooth, shorter than the pedicels. — Sandy 

 waste places and roadsides. April, May. — Not found north of Lower Canada = 

 perhaps introduced. (Eu.) 



11. ALYSSUM, Tourn. Alyssum. 



Like Vesicaria but with a flat pouch: only one or two seeds in a cell: flowers 

 yellow or white. Filaments often toothed. (Greek name of a plant reputed 

 to check the hiccup, as the etymology denotes.) They are plants of the Old 

 World, two adventive species deserving a mere mention, and one indigenous, 

 rare and doubtful. 



1. A. maritimum, L. (Sweet Alyssum), with green or slightly hoary 

 linear leaves, honey-scented small white flowers, and 2-seeded pods, commonly 

 cult., begins to be spontaneous southward. (Adv. from Eu.) 



2. A. CALYCINTTM, L., a dwarf hoary annual, with linear-spatulate leaves, 

 pale yellow or whitish petals little exceeding the persistent calyx, and orbicular 

 sharp margined 4-seeded pod, the style minute, occurs in grass-land at Amherst, 

 Mass., Tuckerman. (Adv. from Eu.) 



3. A. Lescurii. (Vesicaria? Lescurii, ed. 2.) Somewhat pubescent, but 

 green ; stems diffusely ascending from a biennial root : leaves oblong or oval, 

 sparingly toothed, those of the stem half-clasping by a sagittate base ; racemes 

 elongated, many-flowered ; pedicels ascending ; filaments inflated at the base ; 

 style half the length of the hispid orbicular or broadly oval flat pod: seeds wing- 

 margined, 1-4 in each cell, on free stalks. — Hills near Nashville, Tennessee, 

 Leo Lesquereux. April, May. — Petals golden yellow, rather large. Ambiguous 

 between this genus and the next. 



