68 CRUCIFER^K, (mustard FAMILY.) 



§2. DRABELLA. Winter annuals ; leaf y stems short ; flowers white {yellow 

 in u. 5) ; style none. {Leaves oblong or obovate, hairy, sessile.) 



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

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

 short or corymbose in fruit {^-V long); pods broadly linear, smooth, much 

 longer than the ascending pedicels. — Sandy and waste fields, E. Mass. to 

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

 racemes, especially in the var. micraxtha, Gray, with minutely rough-hairy 

 pods, which is found with the other, westward. 



4. D. cuneif61ia, Nutt. Leaves obovate, wedge-shaped, or the lowest 

 spatulate, toothed ; raceme somewhat elongated in fruit (1 -3'), at length equal- 

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

 pods oblong -linear, minutely hairy, longer than the horizontal piedicels. — Grassy 

 places, 111. to E. Kan., and southward. March, April. 



5. D. braehycarpa, Nutt. Low (2-4' high), minutely pubescent; 

 stems leafy to the base of the dense at length elongated raceme ; leaves nar- 

 rowly oblong or the lowest ovate (2-4" long), few toothed or entire; flowers 

 small; jwds smooth, narrowly oblong, acutish (2" long), about the length of the 

 ascending or spreading pedicels. — Dry hills. 111., Ky., Va. {A. H. Curtlss), and 

 southward. April. — Petals sometimes minute, sometimes none. 



6. 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 widel ij-spreading pedi- 

 cels, pubescent or smooth. — Fort Gratiot, Mich., N. Minn., and westward. (Eu.) 



§ 3. ER6pHILA. Petals 2-cleft. [Annual or biennial; flowera white.) 



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

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

 round-oval to oldong-lauceolate, smooth, shorter than the pedicels. — Sandy 

 waste places and roadsides. April, May. (Nat. from Eu.) 



7. ALYSSUM, Tourn. 



Pod small, orbicular, with only one or two wingless seeds in a cell ; valves 

 nerveless, somewhat convex, the margin flattened. Flowers yellow or white 

 Filaments often toothed. Cotyledons accumbent. (Greek name of a plant 

 reputed to check the hiccup, as the etymology denotes. ) 



A. MARfxiMUM, L. (Sweet Alvsstm), witb green or slightly hoary 

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

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



A. CALYcixuM, L., a dwarf hoarv annual, with linear-spatulate leaves, pale 

 yellow or Avhitish petals little exceeding the persistent calyx, and orl)icular 

 sharp margined 4-seeded pod, the style minute, occurs occasionally in grass- 

 land. (Adv. from Eu.) 



8. LESQUERELLA, Watson. 



Pod mostly globular or inflated, with a broad orbicular to ovate hyaline 

 partition nerved to the middle, the hemispherical or convex thin valves nerve- 

 less. Seeds few or several, in 2 rows, flat. Cotyledons accumbent. Filaments 

 toothless. — Low herbs, hoary with stellate hairs or lepidote. Flowers mostly 

 yellow (Named for Leo Lesquereux.) 



