Tree Morning Glory
Ipomoea arborescens

Family: Convolvulaceae

OTHER NAMES
Spanish: palo santo, palo blanco, palo muerto, palo bobo, ozote, casahuate blanco, palo cabra
Nahuatl: Cazahuatl

CHARACTERISTICS
Tropical, deciduous tree reaching almost 40’ tall with stout trunk and branches and large green leaves. This plant flowers during the winter and early spring before the leaves re-appear, often during the fall as well, and rarely, sporadically in summer. The tips of the branches are twining, echoing the vine-like growth form of most morning glories. There is an upper elevational variety (Ipomoea arborescens var. pachylutea) which occurs in the transition between tropical deciduous forest and oak woodland. It differs from the nominate variety (Ipomoea arborescens var. arborescens) in having a yellowish bark and harder wood, much larger and hairier leaves, and dark purple flower throats. It may be more cold-hardy.

LANDSCAPE USE
Specimen tree in a protected location, shrubby screen, or container plant.

Photo by Sky Jacobs, SEINET
Ipomoea arborescens on iNaturalist

GROWING CONDITIONS
AN EXPLANAITION OF TERMS USED

SUN full to part sun
WATER
moderate
SOIL
not picky, but well-drained
HARDINESS
hardy to about mid to upper 20s°F
BASIN
high zone
CONTAINER
does moderately well in containers but will not attain full size
NUTRITION
low
MAINTENANCE
very little

ECOLOGY
The flowers of Tree Morning Glory are a food source for hummingbirds, bees and long-nosed bats. Many insects and animals eat the fallen flowers.

ETHNOBOTANY
The seeds of plants in the Morning Glory family contain ergine a lysergic alkaloid, also known as LSD. Native Americans used this plant in their religious and medicinal ceremonies

NATURAL DISTRIBUTION
From Northwestern Mexico in the Sonoran Desert up into the Sierra Madre.

TAXONOMY AND NAME
Ipomoea comes from the Greek words ips which means “worm”, and homois, which means “similar to.” This refers to most species’ wormlike twining habit—even this species twines at the tips. The species name “arborescens” refers to the treelike nature of this species.

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Arizona Cypress (Hesperocyparis arizonica)

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Arizona Black Walnut (Juglans major)