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The unabridged Random House mentions only "caprifoliaceous: belonging to the Caprifoliaceae, a family of plants including the honeysuckle, elder, viburnum, snowberry, etc."

The caprifoliaceous translations are better clues to Nabokov's whereabouts.

The flora of the fir woods amounts to almost nothing, Colchicum straggles up now and then, this and a grass or Carex, a Caprifoliaceous shrub, and Cotoneaster of Tazeen, and Fragaria are the only forms. 

The rhizophora, the mistletoe, the cornel-tree, in short, all the plants which belong to the natural families of the lorantheous and the caprifoliaceous plants, have the same properties.

It may be said to resemble the family of the honeysuckle, or caprifoliaceous plants, one section of which has alternate leaves, and among which we find several cornel-trees, remarkable for their febrifuge properties.*