Rubiaceae Erithalis fruticosa L. - Puerto Rico G. Castilleja 507 image_info.php?img=images/collections/gcastilleja_000507_01_p.jpg&id=127854#image127854 Rubiaceae Exostema caribaeum (Jacq.) Schult. - Puerto Rico G. Castilleja 505 image_info.php?img=images/collections/gcastilleja_000505_01_p.jpg&id=127855#image127855 Rubiaceae Guettarda elliptica Sw. - Puerto Rico G. Castilleja 519 image_info.php?img=images/collections/gcastilleja_000519_01_p.jpg&id=128052#image128052 Rubiaceae Rondeletia inermis (Spreng.) Krug and Urb. - Puerto Rico G. Castilleja 518 image_info.php?img=images/collections/gcastilleja_000518_01_p.jpg&id=129338#image129338