Pinnae of all lvs 1-jug.; capitula 17—26-fld; bracts 2-3.5 mm; pedicel of lower peripheral fls a little stouter than in var. marginata, 6.5-13 x 0.25-0.4 mm; calyx glabrous overall, 4-7(-8) x 2-3(-3.7) mm, the teeth 0.8-2.6 mm; corolla 7—11 (—12) mm, glabrous or puberulent at tip of lobes, these often unequal, 0.8-4.5 x 1.7-2.3 mm; stamens (14—)16—24, the stemonozone 1.4-2.5 mm, the tube 3.5—6.5 mm; calyx of central fl(s) 2.5—4 x 2—3 mm, the corolla 8-23 mm, the androecial tube (9)11-28 x 2-3 mm.

In seasonally flooded habitats of var. marginata, and like it mostly, perhaps exclusively, on blackwater, below 250 m, nearly confined to the Río Negro basin in T. F. Amazonas, Venezuela, and state of Amazonas, Brazil, downstream in typical form to Barcelós and intergradient to var. marginata as far as Río Cueiras NW of Manaus (not mapped), E just into S state of Roraima (Río Cheriuini) and W to the upper Vaupés and Apaporis in Vaupés, Colombia, in Venezuela not known from N of the mouth of Río Atabapo. — Map 3— Fl. V-X.

One leaf of Colella 2161 (NY) from Río Casiquiare has two pairs of pinnae suggesting passage into var. scheryi.