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28 photos.
The most widely distributed tree in North America, the "quaking aspen"
or "trembling aspen" forms
clonal colonies through develotment of root suckers. Adjacent colonies
may show considerable variation.
ITIS Taxonomic Serial No. 195773
1. September 21, 2011. This clonal colony has been one of the
last
of the many colonies along the Portage Creek road to turn color
in the fall for at least the last 20 years. Most of the colonies have
brilliant yellow leaves in the fall.
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2. May 8, 2008. Catkins and unopened leaf buds. |
3. May 8, 2008. Catkins (sex not known). |
 4. May 23, 2008. Close-up of leaf buds which have just opened. |
| 5. May 23, 2008. Female catkins just as the leaf buds are beginning to open. In contrast to photo 6, the leaves are already green. |
6. May 28, 2009. Young leaves which are just turning green. |
7. June 3, 2008. A female catkin after the leaves have developed. |
| 8. July 25, 2008. An insect gall as well as a leaf infected by a leaf miner. |
9. July 21, 2009. A sucker. The leaves are largest at the bottom. |
10. July 21, 2009. View of the topside of a leaf from the sucker in photo 9. |
| 11. July 21, 2009. The underside of the leaf in photo 10. |
12. August 2, 2009. Left: a leaf from a sucker. Right: a leaf from one of the trees in the clone shown in photo 13. |
13. July 4, 2007. trees which have discarded all but the topmost branches. |
| 14. August 12, 2007. A colony with red and orange leaves. This group turned color at least 2 weeks before the other trees in the area turned. |
15. September 4, 2008. A tree with orange leaves. |
16. September 4, 2008. Close-up of the leaves in photo 15. |
| 17. September 4, 2008. A pair of trees which have turned slightly orange.. |
18. August 15, 2011. A small colony of trees with leaves which have turned red. very early. |
19. August 15, 2011. Close-up of the tree on the left in photo 18. |
| 20. August 25, 2011. A red leaf . |
21. August 25, 2011. A nearly round orange leaf . |
 22. August 30, 2011. A tree with orange leaves. Note some of the branches have yellow leaves. |
| 23. September 13, 2011. A large leaf on a sucker about 4 ft. tall which has turned dark blue. |
 24. August 25, 2012. A tree with orange leaves near the top. |
 25. August 16, 2014. An aspen with crimson fall foliage. |
 26. June 7, 2014. Section of an aspen trunk showing the green chlorophyll in the bark. |
 27. May 31, 2014. Growth on a dead aspen trunk. |
 28. May 31, 2014. Another growth on the trunk in photo 27. |