Trees of Colorado Field Guide (Tree Identification Guides) - Tapa blanda

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Naturalist, wildlife photographer and writer Stan Tekiela is the originator of the popular state-specific field guide series. Stan has authored more than 190 educational books, including field guides, quick guides, nature books, children’s books, playing cards and more, presenting many species of animals and plants. With a Bachelor of Science degree in Natural History from the University of Minnesota and as an active professional naturalist for more than 30 years, Stan studies and photographs wildlife throughout the United States and Canada. He has received various national and regional awards for his books and photographs. Also a well-known columnist and radio personality, his syndicated column appears in more than 25 newspapers, and his wildlife programs are broadcast on a number of Midwest radio stations. Stan can be followed on Facebook and Twitter.

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Green Ash
Fraxinus pennsylvanica

Family: Olive (Oleaceae)

Height: 50-60' (15-18 m)

Tree: single straight trunk with ascending branches and irregular crown

Leaf: compound, 9-16" (22.5-40 cm) long, oppositely attached, made of 5-9 stalked leaflets, each leaflet 1-2" (2.5-5 cm) long, lacking teeth or with a very fine-toothed margin, on a very short leaflet stalk (petiolule), 1/8" (.3 cm) long

Bark: brown with deep furrows and narrow interlacing ridges, often appearing diamond-shaped

Fruit: green winged seed (samara), turning brown when mature, 1-2" (2.5-5 cm) in length, mostly round-ended, sometimes notched, in clusters, frequently remaining on tree into winter

Fall Color: yellow

Origin/Age: native, 75-100 years

Habitat: wet soils, along streams, lowland forest, shade

Range: throughout

Stan’s Notes: Also called Red Ash because it was once thought that the Green Ash and Red Ash trees were separate species. These are now considered one species. Able to survive with its roots under water for several weeks early in spring. Often has a large unattractive growth (insect gall) at the ends of small branches that persists on the tree throughout the year. The strong white wood is used to make baseball bats, tennis racquets, skis and snowshoes.