ClipArt ETC
"Exogen. 1. Section of a branch of three years' growth: a, medulla or pith; b b, medullary sheath; e e, medullary rays; c c c, circles of annual growth; d, bark. 2. Netted veined leaf (oak). 3. Dicotyledonous seed: a, cotyledon. 4. Germination of dicotyledonous seed: a a, seed-leaves or cotyledons; o, plumula. 5. Exogenous flower (crowfoot)." -Whitney, 1911

Section of Branch Showing Exogen

"Exogen. 1. Section of a branch of three years' growth: a, medulla or pith; b b, medullary sheath; e…