Citrus wintersii (=Microcitrus papuana) , the Brown River finger lime, is a shrub native to the Brown River region in Papua-New Guinea. It was previously known as Microcitrus papuana. It has, as the "finger" name suggests, a small, thin fruit, pointed at both ends. It grows near Port Moresby.

A curious citrus-like shrub, 1m - 2.4 m tall, growing naturally in the transition area between eucalyptus savanna and tropical rain forest at the Forestry Station, Brown River, Central District, Papua New Guinea.

Leaves very variable on individual plants. 15mm to 28mm long, 2mm to 6mm wide, medium to dark green.

Fruits cylindric, slightly curved, abruptly beaked at apex and abruptly narrowed at base, 5-8 cm long, 1.0-1.3 cm thick at broadest part, green to yellow at full maturity, 3-5-celled, each cell usually containing 5 seeds.
Fruits with strong odor of limes when crushed.

Branchlets when young are minutely pubescent and angular.