72 CRUCIFER.E. (MUSTARD FAMILY.) 



5. D. nemorosa, 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. lutea, DC). — Fort Gratiot, Michi- 

 gan, and northwestward. (Eu.) 



6. D. cuneif61ia, 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 ivhite.) 

 ••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. Altssum. 



Like Vcsicaria 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 Altsscm), 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. calycixum, 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., Tucker man. (Adv. from Eu.) 



3. A. Lescurii. (Vesicaria 1 ? 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 if the hispi<l orbicular or broadly o\al flat pod; seeds wing-mar- 

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

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

 1 ict ween this genus and the next. 



