Wild Flowering Plants

Rubiaceae
Spermacoce eryngioides   (Cham. & Schltdl.) Kuntze
Puerto Rico to Trinidad, Bolivia to Brazil and N. Argentina.
Quite rare, very erect and sparsely branched herb of open areas at lower elevations, often degraded and seasonally water-logged.
Small protuberances on the underside of the midrib on fresh specimens.
Slideshow