quaking aspen

(Populus tremuloides)

               
Conservation Status

IUCN Red List

not yet assessed

quaking aspen

NatureServe

N5? - Secure

SNR - Unranked

Minnesota

not listed

Wetland
Indicator
Status

Great Plains

 

Midwest

 

Northcentral & Northeast

FAC - Facultative

Nativity

Native

 
Occurrence

Common and widespread

 
Habitat

Dry to moist. Uplands. Full sun.

 
Flowering

Early April to early mid-May

     
Flower Color

Reddish or greenish-yellow

     
Height

40 to 60

     

Identification

This deciduous hardwood tree may be the most widely distributed tree in North America. It is the most abundant tree in Minnesota. It is a successional species that pioneers disturbed sites and is gradually replaced by slower-growing species. It is fast growing and short lived, commonly lasting only 80 to 100 years. Older individuals can survive up to 200 years. It reproduces rapidly by root suckers often forming large clonal colonies. Mature trees in the state are usually 40 to 60 tall and 7 to 12 in diameter at breast height. Large individuals can reach over 90 in height. Some of the tallest quaking aspens in North America are in north-central Minnesota.

It rises on a single stem from a shallow, wide-spreading root system. On well-drained soils it develops a many large and small, branched roots extending horizontally, diagonally, and vertically from the trunk in all directions (heart root system).

The trunk is slender and free of branches on the lower part. The branches are short and stout. The crown is narrow, open, and rounded.

The bark on young trees is smooth with a waxy appearance, and pale grayish-green to whitish-green or almost white. It does not peel like paper birch. As it ages it becomes thick and gray or brown, with broad, flat ridges and shallow furrows, at least near the base of the tree.

The current-season twigs are slender, shiny, hairless, and dark green or reddish-brown with oval, orange dots (lenticels). They are round in cross section and have star-shaped pith. They turn gray and rough in the second year. Quaking aspen is self-pruning, dropping numerous twigs with the leaves in autumn.

Terminal buds are brown, hairless, slightly resinous, and have a shiny or varnished appearance. They are not aromatic. They are about ¼ long, slender, cone-shaped, and pointed. They are covered with 6 or 7 bud scales. Lateral buds are similar but smaller. They are appressed against the twig with the tip pointing inwards. The leaf scars are small and triangular with 3 bundle scars.

The leaves are deciduous, alternate, thin, firm, and not lobed or divided (simple). They hang downward on hairless, 1 to 2¾ long leaf stalks. The leaf stalks are flattened perpendicular to the plane of the leaf blade, at least near the blade attachment. It is often longer than the leaf blade. The flattened leaf stalk causes the leaf to tremble, or quake, in the wind, giving the tree its common name. The leaf blades are broadly egg-shaped to almost round, 1 to 3 long, and 1¼ to 3 wide. They are 0.9 to 1.2 times as long as wide. They taper abruptly at the tip to a short point with concave sides along the tip. They are broadly rounded or almost straight across at the base. The upper surface is dark green or bluish green, shiny or waxy, and hairless. The lower surface is similar but paler green. The margins are finely toothed with 20 to 50 irregular, shallow, blunt teeth per side. The teeth do not have embedded glands. There are no visible warty glands where the leaf blade attaches to the stalk. In autumn the leaves turn bright yellow.

Male and female flowers are borne on separate plants. They appear before the leaves in early April to early mid-May. Both male and female flowers are borne in crowded, pendulous, stalkless catkins on 2nd year branchlets. Male catkins are 1 to 3 long, female catkins are 1 to 2 long. Female catkins elongate when fruiting, becoming 1½ to 6 long.

The fruit is an egg-shaped, to ¼ long, 2-valved capsule. Each capsule contains numerous seeds. The seeds are released early mid-May to early June. They have cottony hairs attached and are dispersed by wind.

 
Similar
Species

Balsam poplar (Populus balsamifera) bark on young trees is greenish-brown. The leaf stalks are rounded, not flattened. The leaf blades much longer, 3 to 6 long, 1.3 to 2.3 times as long as wide. The underside of the leaf usually has blotchy, copper-colored stains. Each tooth on the leaf margin has a small, embedded gland.

 
Pests and Diseases

Gall midge (Harmandiola cavernosa)


Distribution Distribution Map   Sources: 2, 3, 4, 5, 7, 8, 28.

Record

The champion quaking aspen in Minnesota is on private property in or near Emily, in Crow Wing County. In 1999 it was measured at 96 tall and 123 in circumference (39¼ in diameter).

 
Comments

 


Taxonomy

Family:

Salicaceae (willow)

 

Tribe:

Saliceae

 

Genus:

Populus (cottonwood)

 

Section:

Populus (aspens and white poplar)

 
Synonyms

Populus aurea

Populus cercidiphylla

Populus X polygonifolia

Populus tremula ssp. tremuloides

Populus tremuloides var. aurea

Populus tremuloides var. cercidiphylla

Populus tremuloides var. intermedia

Populus tremuloides var. magnifica

Populus tremuloides var. rhomboidea

Populus tremuloides var. vancouveriana

Populus vancouveriana

 
Common
Names

golden aspen

mountain aspen

popple

poplar

quaking aspen

trembling aspen

trembling poplar


 

 

 

 

 

 

 

 

 

Glossary

catkin

A slim, cylindrical, drooping cluster of many flowers. The flowers have no petals and are either male or female but not both.

 

clone

A group of genetically identical individual plants derived from a single parent plant by means of vegetative reproduction.

 

heart root system

A root system in which many large and small, branched roots extend horizontally, diagonally, and vertically from the trunk in all directions.

 

lenticel

A corky, round or stripe-like, usually raised, pore-like opening in bark that allows for gas exchange.

 

simple leaf

A leaf that is not divided into leaflets, though it may be deeply lobed or cleft.

 

sucker

A basal shoot rising from the roots or from a bud at the base of a shrub or tree.

       

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Tree

  quaking aspen    
       

Bark

  quaking aspen    
       

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  quaking aspen   quaking aspen
       
       

 

Camera

     

Slideshows

   
  Populus tremuloides
Blake C. Willson
 
  Populus tremuloides  
 
About

Trembling Aspen

 
     
  Populus tremuloides
Matt Lavin
 
  Populus tremuloides  
 
About

Native tree to 45 m tall, with generally smooth white bark from the base (furrowed with age), orbicular leaf blades born from laterally flattened petioles, throughout the western half of Montana along streams, in wetlands, and on slopes north-facing and similarly protected slopes.

 
     

 

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Other Videos

 
  Tress with Don Leopold- quaking aspen
ESFTV
 
   
 
About

Uploaded on Sep 23, 2011

No description available.

 
     
  Cool Things in Nature!!! Ecosode: Quaking Aspen!
coolthingsinnature
 
   
 
About

Uploaded on May 1, 2011

Hello and welcome to Cool Things in Nature! In today's ecosode, Coolia teaches us about the Quaking Aspen tree! It is possibly the largest organism on Earth! Watch and learn!

 
     
  Quaking Aspen (Populus tremuloides)
Steve McGuinness
 
   
 
About

Uploaded on Aug 28, 2009

Primary succession after a fire: the hummingbirds are loving those new flowers (Penstomen barbatus); they feed on those. Aspens are highly competitive after forest fires; they typically sprout when the soil temperature increases after a fire.

 
     
  Populus Tremuloides
TheCampusTrees
 
   
 
About

Published on Apr 2, 2012

Info about Quaking Aspen

 
     
  MyNature Apps; Identifying Quaking Aspen, Populus tremuloides
MyNatureApps
 
   
 
About

Uploaded on May 30, 2011

How to identify Quaking Aspen, Populus tremuloides

 
     

 

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