Page:Elementary Botany.pdf/15

 ** Buttercup.—This seed (fig. 10) differs from the mustard in that it contains, in addition to the embryo, a certain amount of food-material or endosperm.

In germination, the cotyledons remain in the seed until the food-material is absorbed; they then come above the ground turn green, and act as foliage leaves.

** Comparison of the Bean and the Maizes

Fly. 10. - Butterenp Fruit 4, Embryo; Rn, endoa)ern; ground, En T, terta and perlearp

BEAN MAIZE 1. A meed. 2. Outer akin is tho testa. 1. Arfruit containing thereed. 2. Ouler covering in the wall of the fruit and the testa vom- bined. 3. (ho cotyledon, soed thers fore monovotyledonous. 4. Food-material atored ip 3. Two cotyledons, Roed therefore dicotyledonnus. 4. Food-material storel up in the cotylelons, sood there- nutside the cotyledon, seed fore exalbuminous. 5. Radicle develop« into pri- root, bearing thoroforo albuminous, Radliclo dous not dewelop ruol. strongly; ita place in taken by rout-branches and adventitious mary ranobes. Fonte. 6. Cotyledone remsin below she gronnd. 7. Plumale becones firststem bearing laaves. 8. Cotyledan remains in the sted. 7. Plumulo oonsiste of stenm and rhenthing loares. MUSTARD BUTTERCU" V1, Beed dicotyledonons aad exlbuminous, 2. Cotyledons come abovo the ground. 1. Seed dicotyledonous and albuminous. 2. Cotyledons absorb the en- dosperm and thea oome above the ground.
 * Oomparison of Mustard and Butterepp.