68 CRUCIFER.E. (MUSTARD FAMILY.) 



2. DRABELLA. Winter annuals ; leafy stems short ; flowers white (yellow 

 in n. 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 (-!' 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. MICRANTHA, Gray, with minutely rough-hairy 

 pods, which is found with the other, westward. 



4. D. cuneifdlia, 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 pedicels. Grassy 

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



5. D. brachycarpa, 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; pods smooth, narrowly oblong, acutish (2" long), about the length of the 

 ascending or spreading pedicels. Dry hills, 111., Ky., Va. (A. H. Curtiss), 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 widely-spreading pedi- 

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



3. ER6PHILA. Petals 2-cleft. (Annual or biennial,' flowers white.) 



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. ( 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. MARfriMUM, L. (SWEET ALYSSUM), with green or slightly hoary 

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

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



A. CALYCINUM, 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 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- 

 Jess. 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 Lesqaereux.) 



