Prosopis humilis Gillies ex Hook. & Arn.
Family Fabaceae, Subfamily Mimosoideae
NOTE: Only one seed of Prosopis humilis was available for examination. Therefore, the description and images in this fact sheet may not be representative of this species’ seeds.
Pods linear, compressed, straight or subfalcate; short-stipitate, apex mucronulate, margins barely undulate; 4–10.5 cm long, 8–12 mm wide. Dull, reddish-brown to dark brown; seed chambers visible, (4)7–16. Endocarp segments subquadrate to rhombic, or broader than long, papery to boney, closed, 6–8 mm long, 8–10 mm wide, 3–4 mm thick; mesocarp thin and dry. Seeds oriented longitudinally.
Seeds have an unusual, relatively small pleurogram.
pampas (treeless plains), open semi-xerophytic woodlands, sometimes in rocky or sandy soils
Prosopis humilis is a nearly leafless, spiny, erect to prostrate subshrub, 20–40 cm high. Its peculiar prostrate habit is an oddity. The mesocarp is thin and dry; pods break up into one-seeded segments.