CRUCIFEILE. 15 



clasping with sagittate base. Pods long and very narrow, on 

 erect pedicels. Meadows and old fields. Pretty easily recognized 

 by its strict habit. 



6. A. Drummond'ii, Gray. Flowers white or rose-coloured. 

 Petals twice as long as the calyx. Stem 1-2 feet high, smooth 

 above. Cauline leaves lanceolate or oblong-linear, with sagittate 

 base. Pods long and flat ; the pedicels not so strictly erect as in 

 the last species. Rocky banks of streams. 



5. ERYS'IMUM, L. TREACLE MUSTABD. 



E. cheiranthoi'des, L. (WORM-SEED MUSTARD.) Flowers 

 yellow; inconspicuous. Leaves lanceolate, scarcely toothed, 

 roughish with appressed pubescence. Waste wet places. 



G. SISYM'BRIUBI, L. HEDGE MUSTABD. 



S. officinale, Scop. (HEDGE MUSTARD.) Flowers yellow, 

 small. Leaves runcinate. Stem 1-2 feet high, with spreading 

 branches. A very common roadside weed. 



7. BRAS'SICA, Tourn. CABBAGE, MUSTARD, ETC. 



1. B. Sinapis'trum, Bois. (CHARLOCK.) Flowers bright 

 yellow. Stem 1-2 feet high, branching, it and the leaves hairy. 

 Too common in our grain-fields. 



2. B. nigra. (BLACK MUSTARD.) Flowers sulphur-yellow. 

 Stem 3-6 feet high, round, smooth, and branching. Lower leaves 

 lyrate, Fields and waste places. 



8. DRABA, DC. WHITLOW-GRASS. 



D. arablsans, Michx. Flowers white. Stem leafy, erectly 

 branched, pubescent. Leaves lanceolate or linear, minutely 

 dentate. Raceme short, erect. Pods half an inch long, twisted 

 when ripe. Rocky places. 



9. ALYS'SUM, Tourn. ALYSSUM. 



A. calyci'num, L. A dwarf hoary annual, with linear- 

 spathulate leaves. Calyx persistent. Pod 4-seeded, sharp- 

 edged. Rather rare. 



10. CAMEL'INA, Crantz. FALSE FLAX. 



C. sati'va, Crantz. (COMMON F. FLAX.) Flowers yellowish. 

 Stem 1-2 feet high, straight, erect, branching. Leaves lanceo- 



