View source for Radicula

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Radicula (little radish or root). Syn., Roripa, Nasturtium. Cruciferae. 
Herbs, not cultivated except water-cress, horse-radish, and one or two 
others.

Plants mostly small, perennial, biennial, and annual, with small white 
or yellow fls. mostly in racemes: lvs. (or at least the lowermost) 
usually pinnate or pinnatifid, commonly glabrous: fr. a silicle or 
short silique, globular to cylindrical, with strongly convex nerveless 
valves; seeds usually many, small and marginless, in most species in a 
double row in each locule, the cotyledons accumbent.—Species more than 
50, widely spread in eastern and western hemispheres, inhabiting low 
grounds, swamps, and pools or streams, mostly weedy in character. These 
plants formerly appeared under the name Nasturtium, which, however, 
dates only from 1812 whereas Radicula dates from 1756. These plants 
probably should bear the name Roipa, which see. The nasturtiums of 
gardens are very different plants, members of the genus Tropaeolum.
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