Whitethorn Acacia Plant Information
Whitethorn Acacia grows in the following 5 states:Arizona, Maryland, New Mexico, Texas, Virginia
Vachellia constricta, also known commonly as the whitethorn acacia, is a shrub native to Mexico and the Southwestern United States, with a disjunct eastern population in Virginia and Maryland.
In the Southwest V. constricta grows in the southern half of Arizona, extending into New Mexico and West Texas. It grows in Mexico as far south as Oaxaca, with small disjunct populations in Baja California and in the Magdalena Plain of Baja California Sur.
In the Sonoran Desert, Vachellia constricta grows in arroyos and washes, where it blooms in late spring (April-May), with a second round of blooms in July-October. Blooming requires a minimum amount of rain, followed by a period of warmth.
Vachellia constricta typically grows to 2 metres (6.6ft) in height, occasionally reaching 6 metres (20ft). Its stems range from a light gray to a mahogany color, with pairs of straight white spines anywhere from 0.5 to 2cm long.
The small leaves are even-pinnate, usually 2.5-4cm in length, with each of the 3-9 pairs of pinnae made of 4-16 pairs of leaflets, which are about 3.5mm long and 1mm wide. The flowers occur in small yellow balls about 1cm in diameter. The flowers offer no nectar and little pollen, and so tend to have few visitors. Extrafloral nectaries grow along the main stem of the compound leaves and attract ants to the trees. The seed pods are relatively long and thin, up to 12cm long but only 3-6mm wide.
The leaves may drop in response to either dryness or cold.
Vachellia constricta is cultivated by specialty plant nurseries as an ornamental plant. It is used in native plant desert habitat gardens. It can be trained as a small tree or grown as a barrier hedges.
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