CRUCIFERjE. 21 



Stem 2-4 feet high, glaucous. Cauline leaves ovate-lance- 

 olate or oblong, clasping with sagittate base. Pods long 

 and very narrow, on erect pecZice/s. Meadows and old fields. 

 Pretty easily recognized by its strict habit. 



7. A. eonft'nis, Watson. (A. Drummondii, Gray.) Flow- 

 ers white or rose-colour. Petals twice as long as the 

 calyx. Stem 1-2 feet high, smooth above. Cauline leaves 

 lanceolate or oblong-linear, with sagittate base ; lowest 

 leaves spathulate and toothed. Pods long and flat; the 

 pedicels not so strictly erect as in the last species. Rocky 

 banks of streams. 



8. A. HolbOBl'lii, Hornem. Petals white or rose-colour, 

 occasionally purplish, becoming reftexed, twice as long as 

 the sepals. Stem 6-24 inches high, usually simple, more or 

 less hairy. Lowest leaves small, spathulate, somewhat 

 toothed, with margined petioles; upper sessile, sagittate, 

 linear-lanceolate. Pods reflexed. Style none. N. W. 



7. KllYS MUM, L. TREACLE MUSTARD. 



1. E. eheiranthoi'des, L. (WORM-SEED MUSTARD.) Flow- 

 ers yellow, inconspicuous. Stem slender, branching. Leaves 

 lanceolate, scarcely toothed, roughish with appressed pubes- 

 cence. Pods small and short, on slender diverging pedicels. 

 Waste wet places. 



2. E. as'perum, DC. (PRAIRIE EOCKET.) Flowers showy, 

 bright orange-yellow, rarely purple. Stem stout, 1-2 feet 

 high, simple, hoary, with minute appressed hairs. Leaves 

 oblanceolate. Pods long, ascending on stout spreading pedi- 

 cels. Dry soil, N. W. 



3. E. parviflo'rum, Nutt. Stem low and simple, hoary. 

 Leaves all linear, densely clustered at the base of the stem. 

 Flowers small, sulphur-yellow. Pods long, narrow, ascend- 

 ing, on short pedicels. N. W. 



4. E. orienta'le, KBr. Stem slender and branching, 

 1-2 feet high. Leaves grayish-green, oblong to oval, slightly 

 clasping; radical ones spathulate. Flowers pale yellower 

 cream-coloured, small. N. W. and Atl. Prov. 



