Stenogyne bifida is a scandent perennial herb with quadrangular stems that are glabrous or sparsely pubescent in grooves. The leaves are simple, opposite, ovate to elliptic, measuring 4.2–10 cm in length and 1.7–3.6 cm in width. They have an acute apex and a truncate to obtuse base, and they are glabrous except for pubescence on the midrib. The blades are membranous, and the margins are serrate. The petioles are 5–20 mm long and sparsely hirsute. There are 2–6(–8) flowers per verticillaster (an inflorescence that resembles a whorl but consists of two crowded cymes on either side of the stem), with pedicels 3–4 mm long and puberulent. The calyx is radially symmetrical, narrowly campanulate, 8–12 mm long, enlarging in fruit, and nearly glabrous with linear-lanceolate teeth that are 5–8 mm long. The corolla is bilabiate and pubescent externally, with a pale yellowish-green tube, narrowly funnelform, and nearly straight, approximately 10–16 mm long. The lobes are pale brown, with the upper lip being (3–)4–6(–9) mm long and the lower lip about 2–4 mm long, 3-lobed, with ovate lobes of similar size. There are four stamens, with both pairs either similar in length or the upper pair slightly longer. They are included within the corolla or well-exserted beyond the upper lip. The ovary is superior, 2-carpellate, each carpel longitudinally divided, with basal-axile placentation and one ovule per ovary lobe. The style is exserted, arising between the lobes and shortly 2-lobed. The fruit consists of 2.5–3 mm long nutlets (pictured), 1-seeded, drupaceous, and black at maturity. They have slightly winged margins and an obliquely attached base. They are included within the calyx at maturity, with a fleshy exocarp and an obovoid shape. The seeds lack an endosperm or are scanty and oily. It occured in mesic to wet forests between 450-1,200 meters.