Pyragra is known only from northern Madagascar, and is unusual morphologically and often overlooked. Pyragra is similar to Psychotria, with rapides in its tissues; a shrub habit; stipules that are persistent with the leaves, interpetiolar or shortly fused around the stem, and deeply bilobed on each interpetiolar side of the stem; cymose pedunculate inflorescences that are terminal but quickly become pseudoaxillary due to overtopping growth from one of the axillary buds; reduced bracts; 5-merous, distylous flowers; salverform white corollas with valvate lobes; and bilocular ovaries with a single basal ovule in each locule. However Pyragra differs from Psychotria in its unusual schizocarpous fruits. The fruits of Pyragra are dry, ovate, and strongly flattened in parallel to the septum. At maturity the fruits split along the septum into two mericarps, each with one reticulated seed and corresponding to the pyrene of Psychotria. See Bremekamp (1958: p. 148) for an analytic illustration. These mericarps are supported by a simple carpophore in the shape of a horse shoe, with the pedicel connected at the rounded basal portion. The plants are at least sometimes deciduous and at least sometimes found on limestone substratess. The growth form of Pyragra appears to be gently sylleptic, with the leaves clustered near the ends of the stems; collectors have noted that the leaf veins are whitened. The leaves of both species have well developed crypt domatia.
In general aspect Pyragra is similar to Triainolepis; Triainolepis differs in its ovaries with 2 ovules in each locule, subglobose fruits with several locules, and terminal inflorescences that are generally not displaced to pseudoaxillary. Pyragra is similar to and also related to Cremocarpon, which also has schizocarpous fruits. However the fruits of Cremocarpon are smaller and not laterally flattened, with the carpophore often branched, and its inflorescences are generally not displaced to pseudoaxillary.