- 
48 WEEDS AND USEFUL PLANTS, 
Obs. This is an exceedingly troublesome weed in Furope, and is be 
coming so in some portions of this country, It infests those grou unds 
which are best suited to grain-culture ; as the seeds retain their vitality 
for @ long time it is very difficult te etadicate it when once established. 
Yn this, as * — cases, the plant should be desttoyed before the seed 
formed ; as sheep are fond of the cack they ate sometimes t 
into a field to destroy the crop of Char: 
6. ARMORA’CIA, Rupp. Horserapisn. 
{[Natie from: one of the Greek nathes for Radish.] 
Pod (pouch) elliptical or globose; the valves 7 Ss not genta 
etals white, much rgd e an the calyx. Seeds ni 
undivided or the lower piomatifid. 
1. A. rustica’na, Ro; Cs leaves on ne Me Gickin, oblong, ¢renate, 
rarely pinnatifid ; t ose of the stem lanceo 
Restic ArMoracta. Horseradis 
#7. Moutarde des Capucins. Germ. Det Meei-Rettig. Span. Rabano. 
Root perennial, jong, = fleshy ranch. Hail very acrid, Peg! 2-3 feet high, angular~ 
, Smooth, wii axillary b leaves large be inches pain 
somewhat toe emits . Dac or R iiss oe petioles oles 4-12 inches long. 
‘corymbose, elongating. P. ” Silicles 2 oval, usually saieioae 
fr Tone=J onttog margins of ditehes, wet introd Native of Europe. FF May ~Jume, 
ae “on 21. Field Mustard (Sinapis arvensis), illustrating the general appearance of = 
‘iu this family. Dtneibien eemane antenna enorme 2B. sApode 
