Xyridaceae Xyris tristis L.B.Sm. and Downs - Peru J. G. Graham 5428 image_info.php?img=images/collections/jggraham_005428_01_p.jpg&id=82550#image82550 Xyridaceae Xyris tristis L.B.Sm. and Downs - Peru J. G. Graham 5428 image_info.php?img=images/collections/jggraham_005428_02_p.jpg&id=93307#image93307 Xyridaceae Xyris tristis L.B.Sm. and Downs - Peru J. G. Graham 5428 image_info.php?img=images/collections/jggraham_005428_03_p.jpg&id=93308#image93308