Conductors and Insulators. In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.onductors and Insulators. In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.
Butterhead lettuce. A type of head lettuce whose botanical name is Lactuca sativa var. heirloom. Two common types are Boston and bibb lettuce. Have small, round, loosely formed heads with soft, buttery-textured leaves ranging from pale green on the outer leaves to pale yellow-green on the inner leaves.
Helleborous orientalis Lenten Rose, Lenten Hellebore or Oriental Hellebore-Many colorful hybrids and cultivars. This is the most popular garden variety. Helleborous viridis Green Hellebore or Bear's Foot. Helleborous argutifolius Corsican Hellebore-pale green, cup-shaped flowers and leathery foliage. Helleborous foetidus Stinking Hellebore or Setterwort-Drooping clusters of pale green, bell-shaped flowers and evergreen foliage.