Endostemon palustris

Endostemon palustris is a species of flowering plant in the family Lamiaceae. Commonly called the Cuito River keepsafe, it is endemic to Angola.

Description

This is an aromatic perennial suffrutex with a few erect stems arising from a thick woody rootstock. Stems are tall, branched near the base, square above and rounded below, with both glandular and non-glandular hairs.
Leaves are verticillate, sessile, linear, and folded along the midrib, long and pubescent. The inflorescences are lax, with 4–6-flowered verticils spaced apart; bracts are lanceolate to narrowly ovate.
The calyx is about long at flowering, pubescent and glandular, enlarging to in fruit. The corolla is pale violet, long, with a straight tube widening at the throat. Ovaries are pubescent at the apex.

Identification

This species is related to another Angolan endemic, Endostemon tubulascens, but can be distinguished from it by, among other things, its leaves, which are sessile and linear as opposed to petiolate and elliptic.

Distribution and habitat

Endostemon palustris has only been recorded in central Angola, in marshland close to the source of the Cuito River.