exogen
外長植物;雙子葉植物
Ex·o·gen n. Bot. A plant belonging to one of the greater part of the vegetable kingdom, and which the plants are characterized by having c wood bark, and pith, the wood forming a layer between the other two, and increasing, if at all, by the animal addition of a new layer to the outside next to the bark. The leaves are commonly netted-veined, and the number of cotyledons is two, or, very rarely, several in a whorl. Cf. Endogen.
◄ ►
exogen
n : flowering plant with two cotyledons; the stem grows by
deposit on its outside [syn: dicot, dicotyledon, magnoliopsid]