Panicum obtusum Kunth Hopia obtusa is a species of grass commonly known as vine mesquite.

This plant was treated as Panicum obtusum until recently when more molecular and genetic material revealed new information about it.

[1] Hopia obtusa is a perennial grass with stems up to 20 to 80 centimetres (7.9 to 31.5 in) tall.

Leaf blades are 3–26 cm (1.2–10.2 in) long and 2–7 mm (0.079–0.276 in) wide; they are ascending, firm, glaucous, sparsely pilose near the base, often scabrous on the margins, and involute towards the tips.

Spikelets are 2.8–4.4 mm (0.11–0.17 in) long, ellipsoid, terete to slightly laterally compressed, glabrous, and obtuse.