H. anomalus (H.B.K.) Melch. Shrub or small tree, 1-6 m tall, sparsely pubescent on lower leaf surfaces and midribs above, densely so on young stems, pedicels, and bracts. Leaves alternate; stipules triangular, to 3 mm long, whitish, subpersistent; petioles to 7 mm long; blades elliptic, acuminate, acute at base, 5-15 cm long, 2.5-6 cm wide, remotely to prominently serrate-crenate. Flowers solitary in axils, puberulent; pedicels ca 1.5 cm long, articulate above middle, bracteolate at base; sepals 5, triangular-ovate, acute, ca 9 mm long, persistent; petals 5, white, unequal, the anterior petal 3.5-4 cm long, 1.5-2.5 cm wide, spatulate, with the median lobe green to pale yellow below middle, puberulent inside near base-, the remaining petals +/- oblong, the lateral ones ca 1.5 cm long, longer than the posterior ones; stamens 5; anthers ca 3 cm long, the connective appendages brown, much exceeding anthers, weakly fused laterally to form nectariferous appendages at bases of anthers; filaments very short; style ca 5 mm long, curved near apex toward anterior petal, persistent; stigma terminal, held well above staminal appendages. Capsules ellipsoid, 3-sided, acute, 1-2 cm long; seeds ovoid, 4-5 mm long, tan. Croat 8900. Costa Rica to Colombia and Venezuela. In Panama known from tropical moist forest in the Canal Zone, San Blas, Coclé, Panama, and Darién, from tropical wet forest in Colon and Darién, and from premontane rain forest in Darién. Reported from premontane wet forest in Costa Rica (Holdridge et al., 1971).