Amur maple

(Acer ginnala)

Conservation Status
Amur maple
  IUCN Red List

not listed

     
  NatureServe

NNA - Not applicable

SNA - Not applicable

     
  Minnesota

not listed

     
           
Weed Status
   
 

Invasive

     
           
 
Description
 
 

Amur maple is a moderately fast-growing, moderately long-lived, deciduous, large shrub or small tree. It usually rises on multiple stems, forming a 10 to 20 in height, wider than tall shrub. Sometimes it rises on a single trunk, taking the form of a tree up to 26 tall and up to 12 in diameter at breast height.

When the plant is a tree, the trunk is distinct only to the base of the crown. The branches are spreading. The crown is rounded.

The bark on young trees and stems is grayish-brown, thin, smooth, and marked with fine parallel lines. On mature trees the bark is rough and shallowly furrowed. On older trees the bark is separated into long, thin plates.

The twigs are slender, light brown to yellowish-brown or reddish-brown, and hairless. They are round in cross section and have solid, pale to white pith. The leaf scars are crescent-shaped and have three bundle scars. Leaf scars on opposite sides of the twig are joined by a horizontal line. At the end of the twig is a brown, hairless, 1 16 to long, rounded or blunt terminal bud with usually 4 overlapping scales. The scales have red to orange tips. Lateral buds are egg-shaped and have 2 or 4 overlapping outer scales that obscure 2 inner scales.

The leaves are deciduous, opposite, broadly triangular egg-shaped in outline, ¾ to 3 long, and 1¼ to 2½ wide. They are on 1¼ to 2 long leaf stalks (petioles). When cut, the petioles exude a clear sap. There are no prominent stipules at the base of the petiole. The leaf blades are cut into 3 lobes, sometimes with two additional short lobes. The lobes taper to a sharp point at the tip and have V-shaped sinuses between them. The two lateral lobes are cut to ½ of the way to the base. The central (terminal) lobe is usually much longer than the lateral lobes and is widest at or just above the base. The upper surface is green and shiny. The lower surface is paler green and either completely hairless or hairy just along the main veins. The margins are coarsely and irregularly toothed, sometimes double-toothed. In autumn the leaves turn yellow to red.

The inflorescence is an erect, branched, spreading cluster (panicle) of many flowers at the tips of the branches. The panicles are on long stalks and appear during or after leaf out in May to June.

Male and female flowers are borne on the same tree. Each flower has 4 sepals and 4 petals. The sepals are whitish green. They are fused only at the very base then separated into 4 oblong-elliptic, rounded lobes. The petals are yellowish-white, narrowly spoon-shaped, and 1 32to 1 16 long. Male flowers have usually 8, sometimes 7 stamens. Females have a densely hairy ovary, 1 pistil, and 2 styles. The flowers are fragrant.

The fruit is a pair of dry seed cases (keys) with papery wings attached (double samara). They occur in clusters that droop downward from short stalks. They are slightly spreading, sometimes appearing almost parallel to each other. Individual keys are plump, ¾ to 1 long, attached the the stalk, and slightly connected to each other. The wings alone are typically to 13 16 long. The keys are hairless or sparsely hairy and green initially. The wings turn reddish when the seeds are mature. The keys turning brown in the fall. They drop in late fall just before the leaves. Paired keys remain united when they are shed.

 
     
 

Height

 
 

10 to 26

 
     
 

Record

 
 

There is no record for nonnative species

 
     
 

Flower Color

 
 

Yellowish-white

 
     
 

Similar Species

 
     
     
 
Habitat
 
 

Moist but well drained soil. Drought tolerant. Disturbed forest sites, old fields. Full sun to partial shade. Shade tolerant.

 
     
 
Biology
 
 

Flowering

 
 

May

 
     
 

Pests and Diseases

 
 

 

 
     
 
Use
 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

2, 3, 4, 7, 22, 24, 28.

 
  11/2/2018      
         
 

Nativity

 
 

Native to Mongolia, China, Russia, and North Korea. Introduced and cultivated. Escaped cultivation. Becoming naturalized.

 
         
 

Occurrence

 
 

 

 
         
 
Taxonomy
 
  Kingdom Plantae (green algae and land plants)  
  Subkingdom Viridiplantae (green plants)  
  Infrakingdom Streptophyta (land plants and green algae)  
  Superdivision Embryophyta (land plants)  
  Division Tracheophyta (vascular plants)  
  Subdivision Spermatophytina (seed plants)  
  Class Magnoliopsida (flowering plants)  
  Superorder Rosanae  
 

Order

Sapindales (soapberries, cashews, mahoganies, and allies)  
 

Family

Sapindaceae (soapberry)  
  Subfamily Hippocastanoideae  
  Tribe Acereae  
 

Genus

Acer (maple)  
  Section Ginnala  
       
 

Synonyms

 
 

Acer tataricum ssp. ginnala

 
       
 

Common Names

 
 

Amur maple

ginnala maple

 
       

 

 

 

 

 

 

 

Glossary

Bundle scar

Tiny raised area within a leaf scar, formed from the broken end of a vascular bundle.

 

Panicle

A pyramidal inflorescence with a main stem and branches. Flowers on the lower, longer branches mature earlier than those on the shorter, upper ones.

 

Petiole

The stalk of a leaf blade or compound leaf that attaches the leaf blade to the stem.

 

Sepal

An outer floral leaf, usually green but sometimes colored, at the base of a flower.

 

Pith

The spongy cells in the center of the stem.

 

Samara

A dry fruit consisting of a seed attached to a papery wing; one seeded in Elms and Ashes, two-seeded in Maples.

 

Stipule

A small, leaf-like, scale-like, glandular, or rarely spiny appendage found at the base of a leaf stalk, usually occurring in pairs and usually dropping soon.

       
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Alfredo Colon
       
  Amur maple    
       
MinnesotaSeasons.com Photos
   

Plant

  Amur maple   Amur maple
       

Inflorescence

  Amur maple    
       

Leaves

  Amur maple   Amur maple
       

Leaf

  Amur maple   Amur maple
       

Infructescence

  Amur maple   Amur maple
       

Samara

  Amur maple   Amur maple
       
       

 

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slideshow

       
 
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Other Videos
 
  How to ID Acer tataricum spp. ginnala
Laura Deeter
 
   
 
About

Uploaded on Oct 23, 2008

Key identifying characteristics for Acer tataricum spp. ginnala

   
  Trees with Don Leopold - Amur maple
ESFTV
 
   
 
About

Published on Jul 27, 2012

No description available.

   
  Amur Maple
TheCampusTrees
 
   
 
About

Published on Apr 17, 2012

No description available.

   
       

 

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Alfredo Colon
8/4/2019

Location: Woodbury, Minnesota

amur maple


     
     
 
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