Sheild Indigo is a perennial herb with short stem and a woody rootstock.
Slender, prostrate branches, about a foot long, are covered with silvery
hairs. Alternately arranged, stalkless leaves, 1.5-3 cm long, are
elliptic-oblong, may look roundish sometimes. Flowers occur in 10-20
flowered racemes in leaf axils. The spine of the raceme is 3-angled, which
lend the name to one of its species names triquetra. Purple flowers
are about a centimeter long. The standard petal is circular.
Flowering: August-September.