Strombocarpa reptans

Federal Regulation Name (eCFR)

Prosopis reptans Bentham

Species

Strombocarpa reptans (Benth.) A. Gray

Family

Fabaceae

Subfamily

Mimosoideae

NOTE

Only four seeds of Strombocarpa reptans were available for examination. Therefore, the description and images in this fact sheet may not be representative of this species’ seeds.

Common names

tornillo

Description

Pods tightly coiled (like a corkscrew) into a cylinder, several of which radiate from the receptacle in a cluster; each cylinder composed of 9–19 coils each 2–4 mm thick, cylinders straight or slightly curved, 2.5–5 cm long, 5–8 mm in diameter. Margins nonundulate. Smooth, puberulent when young, lemon-yellow when ripe; seed chambers not visible. Mesocarp reddish, pulpy, tannic; endocarp easily disintegrates. Seeds oriented longitudinally.

Seeds asymmetrically obovate to slightly oblong in outline, 3.9–5 mm long, 2–3 mm wide, 1–1.6 mm thick, umbo absent, elliptic in cross section. Pleurogram average in size. Lens a dull mound.

Identification considerations

Similar species

Pods of:

Strombocarpa reptans (Benth.) A. Gray (Pods have 8–17 coils, puberulous when young.)

Prosopis reptans var. cinerascens (Gray) Burkart (Pods have 9–12 coils.) (non-FNW)

Prosopis pubescens Benth. (Pods have 8–24 coils, puberulous or almost glabrous.) (non-FNW)

Distribution

Argentina, Peru (rare)

General information

Strombocarpa reptans is a low, spiny shrub up to 1 m tall, with underground runners that invade the soil. Its seeds are tightly held in the pods. The two varieties, var. reptans and var. cinerascens, are very closely related morphologically, but helpfully, differ in their geographical distributions; var. cinerascens is found only in Texas and adjoining Mexico.