Leptalix lancifolia Raf.
Leptalix longifolia (Bosc) Raf.
Leptalix media Raf.
Leptalix ovata (Bosc) Raf.
Leptalix richardii (Bosc) Raf.
Leptalix rubicunda (Bosc) Raf.
Leptalix rufa (Bosc) Raf.
Calycomelia elliptica (Bosc) Kostel.
Calycomelia expansa (Willd.) Kostel.
Calycomelia lancea (Bosc) Kostel.
Calycomelia ovata (Bosc) Kostel.
Calycomelia pubescens (Lam.) Kostel.
Calycomelia richardii (Bosc) Kostel.
Fraxinus americana pubescens (Lam.) D.J.Browne,
Fraxinus oblongocarpa Buckley
Fraxinus trialata Buckley
Fraxinus aucubifolia G.Kirchn.
Fraxinus juglandifolia aucubifolia H.Jaeger
Fraxinus arbutifolia Dippel
Fraxinus viridis pubescens (Lam.) Hitchc.
Fraxinus americana aucubifolia (H.Jaeger) Wesm.
Fraxinus americana rubicunda (Bosc) Wesm.
Fraxinus americana subpubescens (Pers.) Wesm.
Fraxinus darlingtonii Britton
Fraxinus glabra P.Lawson ex Beissner
Fraxinus viridis trialata (Buckley) Schelle
Fraxinus campestris Britton
Fraxinus smallii Britton
Calycomelia campestris (Britton) Nieuwl. & Lunell
Calycomelia lanceolata (Borkh.) Lunell
Fraxinus americana pennsylvanica (Marshall) Weston
Fraxinus americana normale Wesm.
Calycomelia pennsylvanica (Marshall) Nieuwl.
Fraxinus pubescens Lam.
Fraxinus nigra pubescens (Lam.) Castigl.
Fraxinus lanceolata Borkh.
Fraxinus juglandifolia subintegerrima Vahl
Fraxinus subvillosa Bosc ex Pers.
Fraxinus cinerea Bosc
Fraxinus elliptica Bosc
Fraxinus fusca Bosc
Fraxinus lancea Bosc
Fraxinus longifolia Bosc
Fraxinus ovata Bosc
Fraxinus richardii Bosc
Fraxinus rubicunda Bosc
Fraxinus rufa Bosc
Fraxinus expansa Willd.
Fraxinus concolor Muhl.
Fraxinus ovalis Willd.
Fraxinus viridis F.Michx.
Fraxinus cerasifolia Hoffmanns.
Fraxinus platyphylla Hoffmanns.
Leptalix pubescens (Lam.) Raf.
Fraxinus lancifolia Raf.
Fraxinus media Raf.
Leptalix cinérea (Bosc) Raf.
Leptalix elliptica (Bosc) Raf.
Leptalix expansa (Willd.) Raf.
Leptalix fusca (Bosc) Raf.
Common Name: Green Ash
Fraxinus pennsylvanica is a deciduous tree that usually grows around 12 - 20 metres tall, but can reach 30 metres or more[
The plant is harvested from the wild for local use as a medicine and source of materials. It has often been planted as an ornamental and street tree[
Fraxinus pennsylvanica is suffering the devastating impact of a recently introduced invasive pest, the Emerald Ash Borer, that has rapidly spread across much of its native range and shows no sign of stopping. The disease causes virtually 100% fatality and regeneration is almost non-existent. A population decline of at least 80% over the next 100 years (and likely much faster than that) is assumed. The plant is classified as 'Critically Endangered' in the IUCN Red List of Threatened Species(2017)[
Central, Eastern and southern N. America - Alberta to Nova Scotia, south to New Mexico and Florida
Streambanks, floodplains, wet upland sites and occasionally in swamps, rarely in pure stands; at elevations up to 3,000 metres[
|Conservation Status||Critically Endangered
Fraxinus pennsylvanica tolerates a broad range of temperatures and precipitation and is probably the most adaptable of all the ash species[
]. It is a very cold-hardy plant, able to tolerate temperatures down to around -30°c when fully dormant[
Prefers a deep loamy soil, even if it is on the heavy side[
]. Most members of this genus are gross feeders and require a rich soil[
]. Plants succeed when growing in exposed positions[
] and also in alkaline soils[
]. They tolerate atmospheric pollution[
]. A fast-growing tree[
]. Plants have little tolerance of shade[
Cultivated as a timber tree in C. and S.E. Europe where it is sometimes naturalized[
]. The cultivar 'Patmore' is disease resistant[
A recently introduced invasive pest, the Emerald Ash Borer has rapidly spread across much of N. America and is devastating the genus Fraxinus. The borer infests and feeds on all the North American ash species it has so far encountered. The nature of the infestation (larval feeding in the phloem) effectively girdles trees as small as 25mm in diameter, which is many years before reproductive maturity, leading to death within five years of infestation. The borer therefore causes virtually 100% mortality of Ash populations. The Ash species are unable to persist for very long through vegetative reproduction, and seeds only remain viable in the soilfor at most 7 - 8 years, so regeneration after borer infestation is minimal or nonexistent. Furthermore, the borer persists in forests in low population densities after major ash population crashes, so the orphaned cohort of ash seedlings that remains is quickly infested as they reach a suitable size[
A dioecious species - both male and female forms must be grown if fruit and seed are required.
Inner bark - cooked[
]. The cambium layer can be scraped down in long, fluffy layers and cooked[
]. It is said to taste like eggs[
]. Inner bark can also be dried, ground into a powder and then used as a thickening in soups etc or mixed with cereals when making bread.
The bark and leaves are a bitter tonic[
]. An infusion of the inner bark has been used in the treatment of depression and fatigue[
The root is diuretic[
A fairly wind resistant tree, it can be grown as part of a shelterbelt planting, and is used in reforestation projects[
Fraxinus species in general are gross feeders with an extensive, fibrous root system, which makes transplanting easy, but means that other species will often not grow well if planted nearby, especially if they are shallow rooted[
A red dye is extracted from the bark[
Logs of wood can be beaten with mauls to separate the growth layers, these layers can then be cut into strips and woven into baskets[
The wood is hard, heavy, rather strong, tough, elastic, brittle, coarse-grained. It weighs 44lb per cubic foot. Used for tool handles, furniture etc[
]. The wood is of poorer quality than Fraxinus americana, though it is usually sold under that name[
The seed is best harvested green - as soon as it is fully developed but before it has fully dried on the tree - and can then be sown immediately in a cold frame[
]. It usually germinates in the spring[
]. Stored seed requires a period of cold stratification and is best sown as soon as possible in a cold frame[
]. Prick out the seedlings into individual pots when they are large enough to handle and grow them on in a cold frame for their first winter. Plant them out into their permanent positions or a nursery bed in late spring or early summer of the following year.
If you have sufficient seed then it is possible to sow it directly into an outdoor seedbed, preferably in the autumn. Grow the seedlings on in the seedbed for 2 years before transplanting either to their permanent positions or to nursery beds.