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Trees of Iowa: An Interactive Key

Osage Orange
(Maclura pomifera)


Leaves  are alternate, simple, with thorns or spines present.

Osage Orange Fruit

In Iowa this medium-sized tree, 50 to 60 feet in height, has  been widely planted in hedges.  It grows with a short trunk and upwardly  arching branches, forming a low, rounded crown.

Hardiness: zones

Growth Rate:


Mature Shape:


Height:


Width:


Site Requirements:


Flowering Dates: April - June

Seed Dispersal Dates: September - October

Seed Bearing Age: 10 Years

Seed Bearing Frequency: Every Year

Seed Stratification: Prechill for one month at 34F to 40F
Osage Orange FlowersOsage Orange Leaves

The leaves are 3 to 5 inches long and do not have teeth along the margin.  They are thick, firm, and dark greenin color.  The buds are partly hidden in the bark and the terminal bud is absent.  The twigs have  thorns that are straight and 1/2 inch in length.

The fruit is round, wrinkled, pale green in  color and 4 to 5 inches in diameter. It consists of numerous small seeds crowded and grown together to form the characteristic "orange." When crushed, the pulpy fruit gives a bitter, milky juice.

Osage Orange TwigsOsage Orange Bark

The bark on young twigs is green.  On older trunks it is orange-brown and deeply furrowed. The inner bark is bright orange.  The bark of the roots is also a bright orange color and furnishes a yellow dye.

 

Click on a thumbnail image below to view a larger picture.
Osage Orange Flowers Osage Orange Flowers Osage Orange Leaves Osage Orange Twigs Osage Orange Flowers Osage Orange Flowers Osage Orange Bark Osage Orange Flowers Osage Orange Fruit Osage Orange Leaves Osage Orange Twigs