GUM n.
pecies of Cistus or rock rose. -- Gum passages, sap receptacles extending through the parenchyma of certain plants (Amygdalaceæ, Cactaceæ, etc.), and affording passage for gum. -- Gum pot, a varnish maker's utensil for melting gum and mixing other ingredients. -- Gum resin, the milky juice of a plant solidified by e…
LEAF n.
epidopterous and dipterous insects, which, in the larval stages, burrow in and eat the parenchyma of leaves; as, the pear-tree leaf miner (Lithocolletis geminatella). -- Leaf notcher (Zoöl.), a pale bluish green beetle (Artipus Floridanus), which, in Florida, eats the edges of the leaves of orange trees. -- Leaf roll…
PALISADE n.
Any fence made of pales or sharp stakes. Palisade cells (Bot.), vertically elongated parenchyma cells, such as are seen beneath the epidermis of the upper surface of many leaves. -- Palisade worm (Zoöl.), a nematoid worm (Strongylus armatus), parasitic in the blood vessels of the horse, in which it produces aneurisms,…