Longleaf cologania, narrowleaf tick clover
Central and southeast Arizona, southwest New Mexico and the Big Bend region of west Texas
Coniferous woodland, between 4,000 and 9,000 feet
Alternate, stalked, pinnate, with three narrow, oblong leaflets, up to 0.7 inches long, rounded at the tip
June to September
Cologania angustifolia is a vine-like plant, with slender, arching to trailing stems, sometimes using other plants for support. Stems have a sparse covering of appressed, greyish, non-glandular hairs. The bright green leaves are pinnately divided into three (occasionally five) leaflets, usually hairless. Leaflets have a prominent, depressed midvein.
Flowers are solitary or in twos or threes, from the leaf nodes, attached by short stalks. The calyx is sparsely hairy, with four (not the usual five of this family) triangular lobes, about a quarter of the length of the calyx tube. The corolla is around one inch long, deep pink to purple in color. The banner petal is notched at the top and generally rounded in outline, while the wing petals are narrow at the base, twisted in the middle and wider towards the tip. The stamens have white filaments and greenish anthers.