Kentucky coffee tree

(Gymnocladus dioicus)

Conservation Status
Kentucky coffee tree
Photo by Randy
  IUCN Red List

not listed

     
  NatureServe

N5? - Secure

SNR - Unranked

     
  Minnesota

Special Concern

     
           
           
           
           
           
           
 
Description
 
 

Kentucky coffee tree is a medium-sized, moderate-growing, deciduous tree that rises on a single trunk from a fibrous root system. In Minnesota mature trees are usually 50 to 70 tall and up to 24 in diameter at breast height, though large individuals can reach over 80 in height and 29 in diameter. It is moderately long-lived, often lasting 75 years, though healthy individuals on favorable sites may survive 100 to 150 years. It spreads by root suckering, often forming interconnected colonies. Unlike most plants in the Pea (Fabaceae) family, the roots do not have nodules.

When growing in open areas the trunk is short, straight, and stout. It usually splits into three or four stout, ascending, principal branches about 10 to 15 above the ground. The crown is rounded and open. The branches are coarse, crooked, and widely spreading or weakly ascending. In forested areas the trunk is longer, the crown is narrow and pyramidal, and there are fewer, shorter branches.

The bark on young trees is light brown and smooth. It quickly breaks into conspicuous, large, flaky scales. On mature trees the bark is silvery gray, often tinged reddish, thick, and shallowly grooved, with scaly ridges that curl outward at the edges. On older trees the bark is dark gray and thick with shallow fissures and flat ridges.

The twigs are widely spaced and very stout. They are not noticeably zigzag. They are grayish-brown with whitish patches, hairless, and covered with scattered orange or pale dots (lenticels). The pith is large. homogeneous (not spongy), and orangish-red. The leaf scars are large, broad, and more or less heart-shaped. They have 3 or 5 large bundle scars.

The tip of the twigs are tapered to a blunt point and there are no terminal buds. Lateral buds are small, inconspicuous, ¼ to long, and bronze. They appear in groups of 2 or 3 above the leaf scars. They are deeply sunken in raised craters that are filled with silky hairs.

The leaves appear in mid-spring before the flowers. They are the largest leaves of any tree in Minnesota. They are also the latest to appear in the spring and one of the first to drop in autumn. They are deciduous, alternate, 12 to 36 long, up to 24 wide, and bipinnately compound with 40 to 100 leaflets. They are on stout, 4 to 8 long, hairless leaf stalks. They are pinnately divided into 4 to 7 primary divisions (pinnae), each with 4 to 6 pairs of leaflets. The lowest pair of pinnae are sometimes replaced with a pair of leaflets.

The leaflets are alternate, egg-shaped to broadly elliptic, ¾ to 3½ long, and to 2 wide. They are usually rounded, sometimes broadly angled, at the base, and taper to a point at the tip, usually with straight sides along the tip, sometimes concave very near the tip. The upper surface is medium or dark green and hairless. The lower surface is pale green and finely hairy, at least along the veins. The margins are untoothed and have an inconspicuous fringe of short hairs. In early autumn the leaves turn yellowish-gold before dropping.

Male and female flowers are usually borne on the separate trees. Sometimes a tree with flowers of one gender will have some inflorescences with both flowers of that gender and bisexual (perfect) flowers. They appear when the leaves are unfolded in late May to late June. The inflorescence is a 2¾ to 8 long, ascending or spreading, unbranched array (raceme) of 18 to 50 flowers at the end of a short branch.

The flowers are about ¾ long and are borne on to 1 long stalks. They have 5 sepals, 5 petals, 10 stamens, and 1 style. The sepals (calyx) are petal-like, greenish-white, linear, and ¼ to long, shorter and narrower than the petals. They are moderately to densely hairy. The petals are greenish-white, narrowly oblong, and 5 16 to 7 16long. They are densely covered with woolly hairs. The stamens are two alternating series, one long and one short, with hairy filaments and yellow anthers. The style is short.

The fruit is a 3 to 6 long, ¾ to 2 wide, to thick, leathery, more or less oblong, flattened, straight or curved pod with 1 to 7 seeds. The pod is yellowish and velvety-hairy at first, later turning turn brown woody. The fruit ripens in Autumn and remains on the tree through the winter. The seeds are to ¾ long and embedded in a green jelly-like pulp.

 
     
 

Height

 
 

50 to 70

 
     
 

Record

 
 

The champion Kentucky coffee tree in Minnesota is on public property near Owatonna, in Steele County. In 2009 it was measured at 68 tall and 138 in circumference (44 in diameter).

 
     
 

Flower Color

 
 

greenish-white

 
     
 

Similar Species

 
     
     
 
Habitat
 
 

Moist to moderately moist. River terraces above the flood plain. Full sun. Not shade tolerant. Well drained soil.

 
     
 
Biology
 
 

Flowering

 
 

Late May to late June

 
     
 

Fruiting

 
 

The large fruit pods of Kentucky coffee tree are probably an adaptation to large mammals of the Pleistocene epoch. Horses, giant sloths, mastodons, and mammoths were present on the North American continent for millions of years. They probably ate the pods and dispersed the seeds in their scat. They disappeared in the Late Pleistocene extinction event, 20,000 to 10,000 years ago, when all large mammals (over 2,200 pounds) in North America went extinct.

 
     
 

Pests and Diseases

 
 

Kentucky coffee tree is relatively disease and pest resistant

 
     
 
Use
 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

2, 3, 4, 5, 6, 7, 8, 24, 28, 29, 30, 72.

 
  2/3/2020      
         
 

Nativity

 
 

Native to Wisconsin, Iowa, and South Dakota

 
         
 

Occurrence

 
 

Uncommon or rare

 
         
 
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

Fabales (legumes, milkworts, and allies)  
 

Family

Fabaceae (peas, legumes)  
  Subfamily Caesalpinioideae  
  Tribe Caesalpinieae  
  Genus Gymnocladus (coffee tree)  
       
 

Synonyms

 
  Gymnocladus dioica (FNA – misspelling?)  
       
 

Common Names

 
 

Kentucky coffee tree

Kentucky coffee-tree

Kentucky coffeetree

 
       

 

 

 

 

 

 

 

Glossary

Bipinnate

Twice pinnate. Divided into leaflets that are further pinnately divided.

 

Calyx

The group of outer floral leaves (sepals) below the petals, occasionally forming a tube.

 

Lenticel

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

 

Linear

Long, straight, and narrow, with more or less parallel sides, like a blade of grass.

 

Perfect

Referring to a flower that has both male and female reproductive organs.

 

Pinna

The primary division of a compound leaf or fern frond. Plural: pinnae.

 

Pinnate

Having the leaflets of a compound leaf arranged on opposite sides of a common stalk.

 

Raceme

An unbranched, elongated inflorescence with stalked flowers. The flowers mature from the bottom up.

 

Sucker

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

       
Visitor Photos
   

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Randy
       

Kentucky coffeetree flower, Freeborn Co., Minn., June 2017

  Kentucky coffee tree   Kentucky coffee tree
       

Old growth Kentucky coffee tree stand, including a long dead fallen giant, west of Faribault, MN, October 2016

  Kentucky coffee tree    
       

Kentucky coffee tree in Owatonna, MN in July 2016

  Kentucky coffee tree   Kentucky coffee tree
       
  Kentucky coffee tree   Kentucky coffee tree
       
  Kentucky coffee tree   Kentucky coffee tree
       
MinnesotaSeasons.com Photos
   
       
       
       

 

Camera

     
Slideshows
   
  Gymnocladus dioicus
Blake C. Willson
 
  Gymnocladus dioicus  
 
About

Kentucky Coffeetree

 
     
  Gymnocladus dioicus
Angie Holmberg
 
   
 
About

Published on Jul 29, 2014

Description

 
     

 

slideshow

       
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Other Videos
 
  Gymnocladus dioicus
VT Dendrology
 
   
 
About

Published on Apr 12, 2016

Kentucky coffeetree

   
       
  Trees with Don Leopold - Kentucky coffeetree
ESFTV
 
   
 
About

Published on Nov 4, 2011

   
       
  Kentucky Coffee Tree.mov
Kimberly Wade
 
   
 
About

Uploaded on Sep 9, 2010

Richard Weber, owner of Springhouse Gardens in Nicholasville, Kenucky, talked about the Kentucky Coffee Tree during the Tree Walk at The Lexington Cemetery. The Lexington Cemetery is home to 200 species of trees.

   
       
  how to identify Gymnocladus dioicus
Laura Deeter
 
   
 
About

Uploaded on Oct 2, 2008

short movie on the key id features

   
       
  Great Trees Trail: Kentucky Coffeetree
MortonArboretum
 
   
 
About

Published on Oct 9, 2014

Joe Rothleutner, Tree Improvement Specialist, discusses the Kentucky Coffeetree on The Morton Arboretum's Great Trees Trail.

   
       

 

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Visitor Sightings
   

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Randy
June, 2017

Location: Freeborn Co., MN

Kentucky coffeetree flower

Kentucky coffee tree


Randy
October, 2016

Location: West of Faribault, MN

Old growth Kentucky coffee tree stand, including a long dead fallen giant

Kentucky coffee tree


Randy
July, 2016

Location: Owatonna, MN

Kentucky coffee tree


Randy
9/22/2015

 

Kentucky coffee tree


     
     
 
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Created: 7/20/2016

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