Abstract
Calathea singularis from southeastern Brazil and Stromanthe palustris from Costa Rica are described as new. Calathea singularis, vegetatively unique within the Marantaceae, has a pulvinus of two separate parts rather than the pulvinar cells contin- uous and encircling the uppermost portion of the pet- iole. Stromanthe palustris, endemic to the Atlantic lowlands of Costa Rica, is described for inclusion in A Manual to the Plants of Costa Rica treatment.
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