Monographs Details: Mitracarpum simplex
Authority: Rusby, Henry H. 1927. Descriptions of New Genera and Species of Plants Collected on the Mulford Biological Exploration of the Amazon Valley 1921-1922. Mem. New York Bot. Gard. 7: 205-387.
Description:Species Description - Sparsely pubescent with short, white, mostly divergent hairs, the leaves somewhat strigose. Stems slender, obscurely quadrangular, more so above than below. Leaves sessile, 2 to 3.5 cm. long, 5 to 10 mm. wide, oblanceolate, acute or acutish, thin, light-green, the midrib and secondaries slender, the latter about 3 on each side, suberect. Cymes small, dense. Bracts coherent, about 3 mm. long, lacerate, the teeth acuminate and very acute. Bractlets setose, slender, acute, unequal, the largest to 3 mm. long. Flowers not dissected. Fruits shortly pedicelled, circumscissile at the middle or slightly lower, the calyx-tube short and broad, about as long as the teeth, which are very unequal, subulate, acuminate and acute, rigid, dark-green.