|Foliage of Populus tremula|
Reproduction[change | change source]
The flowers are mostly dioecious (rarely monoecious) and appear in early spring before the leaves. They are borne in long, drooping catkins. The male flowers have a group of 4–60 stamens on a disk. The female flower is a single-celled ovary in a cup-shaped disk.
Pollination is by wind. The fruit is a two to four-valved capsule, green to reddish-brown, mature in mid summer. It contains tiny light brown seeds surrounded by tufts of long, soft, white hairs which help wind dispersal.
Ecology[change | change source]
Poplars and aspens are important food plants for the larvae of a large number of Lepidoptera species. Pleurotus populinus, the aspen oyster mushroom, is found exclusively on dead wood of Populus trees in North America.
References[change | change source]
- "Genus Populus (poplars)". Taxonomy. UniProt. http://www.uniprot.org/taxonomy/3689. Retrieved 2010-02-04.
- Joint Genome Institute: Populus trichocarpa
- Meikle R.D. 1984. Willows and poplars of Great Britain and Ireland. BSBI Handbook N#4. ISBN 0-901158-07-0.
- Rushforth K. 1999. Trees of Britain and Europe. Collins ISBN 0-00-220013-9.
- Keeler H.L. (1900). Our native trees and how to identify them. New York: Charles Scriber's Sons. pp. 410–412.
- Riparian: along river margins and banks.