The peregrina (Jatropha integerrima) is a small evergreen tree native to Cuba. It seldom gets larger than a shrub in the southern U.S. The common name, peregrina, is Spanish for a female pilgrim.

The peregrina blooms most of the year, bearing both staminate (male) and pistillate (female) flowers, but usually not at the same time. This adaptation tends to keep the peregrina from self-pollinating. Seeds are seldom produced unless there are several peregrinas in an area. This shrub is excellent for attracting butterflies, particularly zebras, monarchs, and swallowtails.

The members of the genus Jatropha contain a phytotoxin, a protein molecule considered highly toxic. When consumed, phytotoxins have a devastating effect on the human immune system. Each time, even a tiny amount of a phytotoxin is ingested, the effect on the body is more violent.

Some species of Jatropha were used medicinally as purgatives in the past, but the toxin varies considerably and herbalists had to guess about the correct dose for the patient. Obviously, with a narrow dosage level between a laxative effect and death, these plants fell out of favor.