epicotyl

Yet she insistently wanted to drop this one directly into nutrient soil, watch the epicotyl lengthen, smile proudly at the upward thrusting plumule, then fuss over stipule and first foliage.

First Contact Ed Higgins 2011

After the cotyledons have attained full length, growth in thickness begins in the area nearest the epicotyl and proceeds toward the margins.

Northern Nut Growers Association Incorporated 39th Annual Report at Norris, Tenn. September 13-15 1948

Later, the meristems of the epicotyl (stem or top) and root axis develop, but the whole embryo is still microscopic in size.

Northern Nut Growers Association Incorporated 39th Annual Report at Norris, Tenn. September 13-15 1948

This is the epicotyl, and another growing tip pointed toward the lower end of the kernel; this is the hypocotyl or the part which penetrates the soil and forms roots.

The First Book of Farming Charles Landon Goodrich

Bean with one cotyledon removed, after sprouting had begun. _a_, Seed-coat; _b_, cotyledon; _c_, epicotyl; _d_, hypocotyl; _e_, endosperm.

The First Book of Farming Charles Landon Goodrich

The pea cotyledons were left down in the soil, the epicotyl alone pushing up to the surface.

The First Book of Farming Charles Landon Goodrich

The part bearing the tiny leaves was formerly, and is sometimes now, called the plumule, but is generally called the epicotyl, because it grows above or upon the cotyledons.

The First Book of Farming Charles Landon Goodrich

By the time the epicotyl, the aboveground part, shoots up, the hypocotyl has already made a good start on a stable root system.

Chicago Reader 2010

These sprout, the hypocotyl thrusts eagerly down into the soil, the epicotyl emerges like clockwork above the soil -- and someone like me comes along and picks it like the weed it is and throws it away.

Chicago Reader 2010