Monographs Details: Calliandra trinervia var. stenocylix Barneby
Authors:Rupert C. Barneby
Authority: Barneby, Rupert C. 1998. Silk tree, guanacaste, monkey's earring: A generic system for the synandrous Mimosaceae of the Americas. Part III. Calliandra. Mem. New York Bot. Gard. 74: 1-223.
Description:Variety Description - Trees attaining 7 m, like var. trinervia in habit, foliage, and inflorescence, glabrous except for strigulose perianth. Stipules (few seen) lanceolate ±4-6 x 1.5-2 mm. Petioles ±1 cm; lfts 3 per pinna, the distal pair ±13-14 x 5-7 cm. Peripheral fls staminate, the calyx 6.8-8 x 2.4 mm, its teeth ±2.2 mm, the corolla 13.5-14 mm, its lobes to 2.2 mm; androecium ±4.7 cm, 28-merous, the tube 17 mm, the tassel pink; modified trumpet fls present but not closely examined. Pod unknown.

Distribution and Ecology - In forest on terra firme, near 150-200 m, known only from the type-locality on Rio Solimões near 68°W in state of Amazonas, Brazil. — Map 31. — Fl. IV-V.

Relationships - The var. stenocylix differs materially from widespread var. trinervia only in the modified calyx, which is about half as long as the corolla, not one- third or less as long. Its narrow stipules are shared with var. pilosifolia and with some Brazilian and Colombian forms of var. trinervia, and its relatively numerous (±28) filaments with some sub-Andean forms of the same.

Distribution:Amazonas Brazil South America|