Medical Definition of ERYTHROPOIESIS. : the production of red blood cells (as from the bone marrow)âcalled also erythrocytopoiesis, erythrogenesis. â erythÂ·roÂ·poiÂ·etÂ·ic \-Ëet-ik\ adjective.
Horticultural. Pop ash has several redeeming characteristics that make it an interesting, attractive, and useful landscape tree. Its small to medium size, wide spreading crown, crooked and multi-stemmed trunk, glossy and compound leaves, and fast growth rates make it a decorative addition to landscapes.lowers are 1/8 inch long and bloom in early spring before leaves emerge. The blooms appear in clusters of many yellow (male) and green (female) flowers. Fruits are 1Â½ to 2 inch long elliptical samaras (winged seeds) that have 1 wing (or occasionally 3).
The native mountain ashes are just as beautiful, but most species tend to be shrubby in nature. The European mountain ash has a more distinctly treelike form. Description of mountain ash tree: This small to medium tree (up to 50 feet tall) has light grayish bark and an oval, open head at maturity. It produces clusters of white flowers in spring followed by bright, long-lasting, orange-red berries in fall that attract birds.