Vachellia constricta aka Mescat Acacia

Vachellia constricta is also called whitethorn acacia. It belongs to the pea family. Its older name is Acacia constricta. It grows wild from Arizona to Texas and across Mexico. Its range spans the Sonoran and Chihuahuan deserts. It grows in desert scrub and grassland. It also grows along desert streams and other watercourses. Sites include dry hills, mesas, and canyons. It grows in washes and floodplains, too. It can grow on poor soils in these dry lands.

This slow-growing plant forms a large shrub or small tree. It has many upright branches and a wide crown. It can form thickets. Reported garden heights reach about 15–16 feet [4.6–5 metres]. Spread can reach about 16 feet [5 metres]. Some plants reach 20 feet [6 metres]. Young bark is smooth and reddish brown to gray-brown. Older bark forms scales and grooves. Thin, reddish twigs bend a little between their nodes. These are the points where leaves grow. Pairs of white spines stand at the leaf bases. Older branches may have fewer or smaller spines.

The green to gray-green leaves have many fine parts. They are bipinnate: each leaf divides twice into small leaflets. The plant keeps some leaves through part of the year. Small yellow flowers form sweet-scented balls on long stalks. Sources give different bloom times. Chicago Botanic Garden lists November through April. Virginia Tech reports blooms in spring. It also notes scattered flowers through summer. A cool winter spell helps it flower well. Bees and other insects pollinate the flowers. Thin red-brown pods follow. Each has narrow waists between its flat seeds.

Give this plant full sun and soil that drains well. Sandy soil and loam suit it. It accepts neutral to alkaline soil, even highly alkaline ground. It copes with drought, salt, and soil low in nutrients. Give less water in winter, when growth rests. Chicago Botanic Garden lists USDA zones 7–13. Use it as a specimen or in a border. It draws birds and butterflies. Deer tend to avoid it. Its roots help stop soil loss. Its thorny growth can shield new plantings from grazing. It also fixes nitrogen.

Past accounts record people eating the seeds after thorough cooking. The seeds have limited food value. Do not eat them raw. Records also note past uses as medicine. People used leaves, pods, seeds, roots, and flowers. These uses do not prove that it is safe as medicine. Nor do they prove that it helps health.