M. Gilbert (2006) Pergularia. Flora or Somalia 3: 248

Plants twining herbs or vines, pubescent, with white latex. Leaves ovate to suborbicular, with strongly cordate bases. Inflorescences axillary, pedunculate, initally appearing umbellate but lengthening into a raceme. Corollas with short tuves and spreading lobes; coralline coronas absent; gynostegial coronas in 2 series, the outer of 5 interstaminal lobes arising from the column at the mouth of the corolla tubes, the inner of 5 staminal lobes adnate to the staminal column to about half-way up the anther wings, semisagittate in outline a basal projectiion and free, subulate tips that arch over the head of the column; pollinaria with a pair of hanging, flattened pollinia. Follicles usually paired, on reflexed pedicels, lanceolate, curved silightly into a long attenuate beak, surfaces pubescent, smooth to strongly spiny; seeds flattened, ovate, pubescent on both surfaces, the margins dentate to crenulate. 

Pergularia is a genus of two polymorphic species that grow from Africa through the Arabian Peninsula to India.    

Key to the species of Pergularia in Somaliland and Somalia.

H. Pickering & A.I. Awale (2018) Introduction to the plants of Central Somaliland

Habit: Perennial twining herbs with white latex and pubescent or tomentose stems.

Leaves: Ovate to suborbicular leaves.

Flowers: Corollas with short tubes and spreading, ciliate lobes. Coronas composed of two parts, an outer whorl of interstaminal lobes and an inner whorl of 5 lobes with free, narrow tips that arch over the edge of the gynostegium.

Fruits: Pairs (usually) of follicles that contain many seeds,

Seeds: Flattened, pubescent on both sides and with a tuft of hairs at one end. 

Pergularia has two species. Both are widespread in Africa and have ranges that extend eastward from the Arabian Peninsula to India

Pergularia daemia has leaves that may be glabrous or pubescent but not tomentose and peduncles that are at least 4 cm long.

Pergularia tomentosa has leaves that are tomentose on both surfaces and peduncles that are 1-3 cm long. 

Global distribution of Pergularia.

Note: GBIF records include introduced and cultivated plants. Consequently, the distribution shown often differs from statements about a taxon's native distribution.