True Hickory and Pecan Hickory

by Eric Meier

The Carya genus (or what is more commonly referred to as Hickory) is divided into two main groupings: true-hickory, and pecan-hickory. Species in the true-hickory group tend to be slightly denser, and therefore a bit harder and stronger than the species in the pecan-hickory group. However, because the two ranges of densities so closely overlap, using the weight of the wood to separate hickory is unreliable.

True Hickories:

Pecan Hickories:

 

Distinguishing between these two groups of hickory is fairly straightforward. The quickest and easiest means of differentiating them is by observing the bands of parenchyma—in pecan-hickories, the bands are present in both the earlywood and latewood portions of the wood. In true-hickories, the bands of parenchyma are absent from the earlywood portion of the wood.

Shagbark Hickory (endgrain 10x)
Shagbark Hickory (endgrain 10x)

Pecan (endgrain 10x)
Pecan (endgrain 10x)

The sample of Shagbark Hickory on the left lacks parenchyma bands in the earlywood zone—characteristic of true-hickory. The sample of Pecan on the right shows uninterrupted bands even through the earlywood zone, indicating pecan-hickory. (Click for enlargements)

In addition to the continuous parenchyma bands (in reticulate pattern), another indicator of pecan-hickory is a tendency to be more semi-ring-poroous rather than strictly ring-porous, with a more gradual transition from the larger earylwood pores to the smaller latewood pores. However, although the two groups of hickory can be reliably separated, identifying particular species within each grouping is usually not possible.

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Mihai
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Mihai

There are no such thing as true or pecan hickory.Pecan is a hickory from Carya genus.Somme hickory like the pecan is, grow faster thats why they are slightly denser .Also all of these hickory including the pecan,crossbreed offten in the wild ,hican trees being even comercially available.

Hubert Cumberdale
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Hubert Cumberdale

Well then, my dendrology professor must be mistaken…

Kenny
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The details and knowledge provided has been both interesting and beneficial in my firewood collection and general interest as an avid outdoorsman and hardwood heating hoarder?