Monopsis scabra Urb.

Perennial herb. Stems few to many, up to 250(-400) mm long and about 1 mm thick growing from a thin woody taproot, angular, branching mainly at the base, prostrate to ascending, often supported by surrounding vegetation, pubescent to nearly glabrous. Prostrate stems sometimes producing adventitious roots, leaves usually dense, alternate, sub-opposite or sub-whorled, usually entire, spreading, often becoming deflexed, shortly petiolate to sub-sessile, linear to narrowly elliptic, 7-16(-24) x 1-2(-3) mm. Lower leaves often much shorter, sometimes unidentate. Margins thickened below, often slightly revolute, scabrous. Surface glabrous. Apex and teeth mucronulate. Inflorescence an irregular raceme, fertile nodes separated by many sterile nodes. Fertile nodes solitary or sub-venticillate in groups of 2-4. Bracts leaf-like, bracteoles 1/2 the size of bracts. Pedicels 20-60 mm long, sparsely pubescent with incurved hairs, pubescence denser towards the apex, sometimes with scattered long (± 1 mm) patent hairs near the apex, ascending at anthesis, becoming deflexed at or above the middle later, hypanthium about 2.0 x 1.5 mm, thinly pubescent with incurved hairs, especially on the nerves, usually also with scattered or dense long (± 1 mm) patent hairs, sepals linear, 3.0-6.0 x 0.5 mm, patent to slightly recurved at anthesis, glabrous to scabrous, usually with scattered long (± 1 mm) patent hairs, mucronate. Corolla bilabiate, 10-19 mm long, split nearly to the base on the abaxial side, ochreous yellow, normally with a dark purple mouth and purple veins outside and with yellow markings in the throat, pubescent and with few to many long (± 1 mm) patent hairs on the nerves outside. Abaxial lip of 2 contiguous clawed segments with elliptic blades fused for about 1 mm to the tube at the base. Adaxial lip of 3 segments fused for 6-11 mm from the base, forming patent ovate-triangular lobes, stamens 6-10 mm long, concealed beneath the abaxial corolla segments. Anthers 2.5-3.0 mm long, straight, unequal, penicillate. Style slightly exserted. Stigmatic lobes protruding between abaxial corolla segments. Capsule inverted, sub-globose, 5-7 x 4-5 mm. Seeds ellipsoid, reticulate, about 0.8 mm long.