Palo Pinto
Chloroleucon mangense var. leucospermum

Family: Fabaceae

OTHER NAMES
Spanish: palo fierro, palo ébana

CHARACTERISTICS
Large evergreen shrub or small tree reaching about 20’ tall. White pin-cushion flowers in spring followed by crinkly legume pods. The bark begins green but after peeling the trunk is layered with dark and light browns—gorgeous mottled trunks. Branches are thorny.

LANDSCAPE USE
Screening shrub or small shade tree.

Photo of Chloroleucon mangense var. leucospermum at University of Arizona Arboretum

GROWING CONDITIONS
AN EXPLANATION OF TERMS USED

SUN full to part sun
WATER
moderate to low
SOIL
not picky, but well-drained
HARDINESS
protect from frost, temperatures in the high 20s°F. will damage leaves and twigs
BASIN
high zone
CONTAINER
does moderately well in containers but will not attain full size
NUTRITION
low
MAINTENANCE
very little

ECOLOGY
The trunk is often hollow inside, providing a shelter for many invertebrates, and small mammals. The wood of Chloroleucon mangense is very sought after for firewood and is used in construction to make durable posts.

ETHNOBOTANY
The beans and leafage are often a food source for certain livestock, as well as shade for the livestock as well.

NATURAL DISTRIBUTION
This species is native from Mexico to South America, but this variety is from Sonora and Baja California.

TAXONOMY AND NAME
This plant is in the Fabaceae, the legume family. Chloroleucon has 11 species native to the tropical Americas, ranging from Mexico through Central America, the Caribbean, and South America to northern Argentina.
Formerly known as Pithecellobium leucospermum and P. undulatum.
The genus name Chloroleucon is derived from the Greek words chloros, meaning "green," and leukos, meaning "white." This perhaps refers to the colors from the branches and trunk (begining green and ending up whitish in some species). We are unsure of what the species mangense is referring to, perhaps the plant has a relationship with the mineral manganese? The variety name “leucospermum” is compounded from the Greek words leukos meaning white, and sperma meaning seed, so "white seed".

Chloroleucon mangense var. leucospermum on iNaturalist
Chloroleucon mangense var. leucospermum at the UA Campus Arboretum where you can see one of the few plants in cultivation in the United States

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Chiltalpa (xChitalpa tashkentensis)

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Sonoran Sea Grape (Coccoloba goldmanii)