Arizona ash
| Arizona ash | ||||||||||||
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Arizona ash ( Fraxinus velutina ) |
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| Fraxinus velutina | ||||||||||||
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The Arizona Ash ( Fraxinus velutina ) is a deciduous tree art from the genus of ash trees in the family of Oleaceae . Their natural range is in the southwestern United States and on Baja California .
description
The Arizona ash is a 10 to 12 meter high deciduous tree with a rounded crown and rising branches. The twigs are thin and hairless to densely hairy. The terminal buds are brown and conical to ovoid. The leaves are 10 to 15 centimeters long, composed and consist of three to nine, usually five sessile or up to 6 millimeters long stalked leaflets . The leaflets are 2.5 to 7.5 centimeters long, obovate to lanceolate, pointed with a broadly wedge-shaped to rounded base. Usually both the top and bottom of the leaf are hairy. Both the hairiness and the shape of the leaflets are highly variable. The flowers are dioecious and stand in short, often hairy, lateral panicles . Petals are missing. The flowers appear with the leaves in May. The fruits are 1.5 to 2 centimeters long, winged nuts with a round cross-section , the wing edge of which runs down to the middle.
Distribution and ecology
The distribution area of the Arizona ash ranges from southern California over Arizona to New Mexico and south to Baja California . There it thrives as floodplain and riparian wood on moderately dry to fresh, weakly acidic to strongly alkaline, sandy, gravelly or loamy, nutrient-rich soils in sunny locations. It loves warmth and is usually frost hardy .
Systematics
The Arizona ash ( Fraxinus velutina ) is a species from the genus of ash ( Fraxinus ) from the olive family (Oleaceae). It is the section Melioides assigned. A synonym of the species is Fraxinus pennsylvanica subsp. velutina G. N. Mill. , with which it is assigned as a subspecies of the red ash .
In addition to the nominate form Fraxinus velutina var. Velutina , the variety Fraxinus velutina var. Coriacea (S. Wats.) Rehder is distinguished. It differs through the more leathery and reticulate and less hairy leaves. The variety is found in California.
proof
literature
- Andreas Roloff , Andreas Bärtels: Flora of the woods. Purpose, properties and use. With a winter key from Bernd Schulz. 3rd, corrected edition. Eugen Ulmer, Stuttgart (Hohenheim) 2008, ISBN 978-3-8001-5614-6 , p. 313.
Individual evidence
- ↑ a b c Roloff et al .: Flora of the Woods , p. 313
- ^ Fraxinus velutina. In: Germplasm Resources Information Network (GRIN). United States Department of Agriculture, accessed December 29, 2010 .
