bitternut hickory

(Carya cordiformis)

               
Conservation Status

IUCN Red List

not yet assessed

bitternut hickory

NatureServe

N5? - Secure

SNR - Unranked

Minnesota

not listed

Wetland
Indicator
Status

Great Plains

FACU - Facultative upland

Midwest

FACU - Facultative upland

Northcentral & Northeast

FAC - Facultative

Nativity

Native

Occurrence

Common

Habitat

Moist to dry. Wet bottomlands, dry uplands. Moderately shade tolerant.

Photo by Randy
Flowering

Early May to early mid-June

 
Flower Color

Green

 
Height

40 to 80

 

Identification

This is a slow-growing, deciduous, hardwood tree. It rises on a single stem from a deep root system with a central taproot. In Minnesota mature trees are usually 40 to 60 tall and 12 to 24 in diameter at breast height. Large individuals can reach over 90 in height and 48 in diameter. It is a long-lived tree, often surviving 200 years.

The trunk is straight and slender. It is distinct into the upper part of the crown and is often free of branches for much of its length. The crown is narrow, rounded, and short. The branches are slender and ascending.

The bark on young trees is thin and gray or greenish-gray, with pale, orangish or yellowish, irregular, vertical cracks. It remains like that for many years. As it ages it separates into tight, flat-topped, interlacing, vertical ridges and narrow, shallow furrows. At this stage it has an appearance similar to a woven basket. On older trees it develops tight, rough ridges and diamond-shaped furrows, looking much like the bark of green ash. It does not develop loose, shaggy scales at any stage.

The twigs are moderately stout, greenish-brown to gray brown, with numerous lighter dots (lenticels). They have whitish hairs near the tip but are otherwise hairless. They are round in cross section and have brownish-white, star-shaped pith. The leaf scars are slightly raised and 3-lobed to oval. They have many bundle scars that are either scattered or arranged in 3 clusters forming a monkey face pattern.

Terminal buds are sulphur yellow, to ¾ long, slender, and flattened, with 2 to 4 valve-like bud scales. The scales are themselves densely scaly with yellow, bran-like scales, and have straight, soft hairs near the tip. Lateral buds are similar but shorter, diverge from the twig, and have 2 protective bracts at the base. The buds open valve-like when the new shoot emerges.

The leaves are deciduous, alternate, 6 to 10 long, and pinnately divided into usually 7 or 9, sometimes 11, rarely 5, leaflets. They are on 1¼ to 2¾ long, minutely hairy leaf stalks.

The upper 3 leaflets are elliptical to inversely egg-shaped, 2¾ to 6 long, ¾ to 2 wide. The terminal leaflet is usually no larger than the adjacent pair. The remaining leaflets are similar in shape but progressively smaller. All leaflets are stalkless or nearly stalkless, including the terminal leaflet. The blades are widest in the middle and taper toward both ends. They taper unevenly to a blunt or acute base, and taper to a point at the tip with concave sides along the tip. The upper surface is dark green and sometimes hairy along the midvein but otherwise hairless. The lower surface is pale green, hairy along the midvein, and otherwise sparsely hairy, becoming hairless with age. The margins are finely or coarsely toothed with sharp, forward pointing teeth. They do not have hairs on each tooth. In autumn the leaves turn golden yellow.

Male and female flowers are borne on the same branch. They appear when the leaves are nearly full size in early mid-May to mid-June. The male inflorescence is 3 cylindrical, drooping clusters (catkins) of numerous tiny flowers. Each catkin is 1½ to 4 long. The 3 catkins are attached to a single stalk rising from the base of current-year twigs, and from leaf axils of previous season leaves. The female inflorescence is 2 to 4 flowers on a 5 16 long spike at the end of current-year twigs.

The fruit is a nut enclosed in a thin, leathery husk. The husk is ¾ to 1¼ long, slightly wider, 1 16 to thick, and globular. It is not compressed or is only slightly compressed on the top. There are 4 wings extending from a short, sharp tip to below the middle. The fruit ripens in September and October and is dispersed from September to December. The ripened husk splits open at the base to release the nut. The nut is light brown and elliptic to egg-shaped. It is not compressed or is only slightly compressed on the top, and is rounded at the base. The shell is thin and the kernel is bitter.

 
Record

The champion bitternut hickory in Minnesota is on private property in or near Canton, in Fillmore County. In 2002 it was measured at 94 tall and 73 in circumference (23¼ in diameter).

 
Similar
Species

Northern shagbark hickory (Carya ovata) bark forms peeling strips. Current-year twigs are hairy. The buds are tan to dark brown and have 6 to 9 thin, overlapping scales. The leaves have 5, rarely 7, leaflets. The leaf margins have small tufts of hairs. The fruits are larger, 1 to 19 16 long, and have a thick, woody husk.

Green ash (Fraxinus pennsylvanica) buds are reddish-brown, not yellow.

Wild sarsaparilla (Aralia nudicaulis) compound leaf segments looks similar to the compound leaves of a bitternut hickory seedling. However, the former are longer-tapered, less abruptly tapered, at the tip. The leaves never have more than three compound segments, while a bitternut hickory seedling may have several compound leaves.

 
Pests and Diseases

Ceratocystis Canker of Bitternut Hickory (Ceratocystis smalleyi) enters through an entry or exit hole of hickory bark beetle. It causes sunken cankers in the main stem of the tree.

Hickory bark beetle (Scolytus quadrispinosus)

Phomopsis gall on hickory (Phomopsis spp.) Phomopsis is a genus of fungi that cause galls on branches and trunks.


Distribution Distribution Map   Sources: 2, 3, 4, 5, 7, 8, 24, 28.

Comments

 


Taxonomy

Family:

Juglandaceae (walnut)

 

Subfamily:

Juglandoideae (walnut)

 

Tribe:

Juglandeae

 

Subtribe:

Caryinae

 

Genus:

Carya

 

Section:

Apocarya (pecans)

 
Synonyms

Carya cordiformis var. latifolia

Hicoria cordiformis

 
Common
Names

bitternut hickory


 

 

 

 

 

 

 

 

 

 

Glossary

acute

Referring to leaf shapes that taper to a pointed tip with more or less straight sides, the angle at the tip less than 90°.

 

axil

The upper angle where a branch, stem, leaf stalk, or vein diverges.

 

bract

Modified leaf at the base of a flower stalk or flower cluster.

 

catkin

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

 

lenticel

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

 

pinnate

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

       

Visitor Photos

   
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Randy


Old bitternut hickory trunk

  northern shagbark hickory    
       

Mixed woods, hickory/oak/maple/basswood

  northern shagbark hickory    
       

Fall color

  bitternut hickory   bitternut hickory
       

Young Bitternut Hickory

  bitternut hickory    
       

...a very large, very old, bitternut hickory growing wild near Faribault, MN. Would likely be state champ except that it is double trunked.

  bitternut hickory   bitternut hickory

       
       
       

MinnesotaSeasons.com Photos

   

Leaves

  bitternut hickory   bitternut hickory
       
  bitternut hickory    
       

Bark

  bitternut hickory   bitternut hickory
       

Seedling

  bitternut hickory   bitternut hickory
       
       

 

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  Trees with Don Leopold - bitternut hickory
ESFNature
 
   
 
About

Published on Dec 12, 2013

Don Leopold demonstrates the characteristics of bitternut hickory.

Content produced by Christopher Baycura for the SUNY College of Environmental Science and Forestry (SUNY-ESF).

 
     
  Carya cordiformis
VT Dendrology
 
   
 
About

Published on Apr 18, 2016

bitternut hickory

 
     

 

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Share your sighting of this plant.

Randy
12/12/2016

Old bitternut hickory trunk

northern shagbark hickory


Randy
October 2016

Location: Freeborn County

Mixed woods, hickory/oak/maple/basswood

northern shagbark hickory


Randy
October 2016

Location: Freeborn County, MN

Fall color

bitternut hickory


Randy
August, 2016

Location: Freeborn County, MN

Young Bitternut Hickory

bitternut hickory


Randy
10/17/2015

Location: near Faribault, MN

...a very large, very old, bitternut hickory growing wild near Faribault, MN. Would likely be state champ except that it is double trunked.

bitternut hickory


     
     
 

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