Leaves simple, cross-opposite or distichously, rarely alternate or verticillate, eucamptodromous or acrodromous
. Inflorescences composed of dyads, triads or monads grouped in spikes or racemes, found in the leaf axils or solitary.
The venation is acrodromous
, with three principle and two inconspicuous veins.
Pachyanthus monopleurus has some distinctive features such as the presence of peltate scales, absence of acrodromous
venation and globose and cucullate external calyx lobes.
affinities with acrodromous venation in that its secondaries are
venation of Disanthus consists of acrodromous primaries with
Primary venation type: (0) pinnate; (1) actinodromous; (2) palinactinodromous, but with basal origination of three primaries; (3) acrodromous
The same terminology is applied to the medial lobe of hastate, saggitate, and cordate leaves, which usually have three basal, acrodromous
primaries, supplying the medial and basal lobes.