Leucophyllum frutescens

Leucophyllum frutescens, commonly called Texas sage, silver leaf, or barometer bush, is a compact but loosely branched shrub typically growing to 5-8' tall. Plants tend to sprawl with age unless pruned as needed. This shrub is native to rocky limestone slopes in calcareous soils in the Chihuahuan Desert, extending from northern Mexico into Texas and New Mexico. 

Attractive silver-gray leaves (to 1" long) with stellate hairs are close to being evergreen, but some leaf drops will occur in winter. Small, 5-lobed, tubular, purple flowers (to 1" long) bloom singly from the leaf axils at various times during the year but primarily from summer into fall. Flower bloom is typically triggered by rains or significant soil moisture, hence the common name of barometer bush. Flowers give way to 2-valved capsules.