Stems branched, 50–120 cm; branches spreading-ascending, quadrangular-ridged, scabrous. Leaves spreading-ascending; blade filiform, 16–40 x 0.4–1 mm, margins entire, midvein harshly scabrous, adaxial surface scabrous; axillary fascicles: length 1/2–1 times subtending leaves. Inflorescences racemiform-paniculiform, flowers 1 per node, some flowers pseudoterminal; bracts shorter than pedicels. Pedicels spreading-ascending, 12–50 mm, scabrous. Flowers: calyx hemispheric, tube 3–4(–5) mm, glaucous, lobes erect, subulate, 0.1–0.6 mm; corolla dark pink to rose, with 2 yellow lines and purple spots in abaxial throat, 22–33 mm, throat sparsely pilose externally and glabrous within across bases of adaxial lobes, sparsely villous at sinus, lobes: abaxial reflexed-spreading, adaxial spreading, 6–12 mm, equal, glabrous externally; proximal anthers parallel to filaments, distal perpendicular to filaments, pollen sacs 2.5–3.8 mm; style strongly exserted, 9–18 mm. Capsules globular, 4–6 mm. Seeds black, 0.5–0.8 mm. 2n = 26.
Phenology: Flowering Sep–early Oct.
Habitat: Dry, open pine savannas, open pine-oak sandhills, dry upslope areas of wiregrass-dominated mesic prairies, chalky glades or roadsides, dry sandy or clay roadsides beside existing or remnant savannas.
Elevation: 0–100 m.
Ala., Fla., Ga., La., Miss., Tex.
Agalinis pulchella is an uncommon species in the easternmost area of its range and is common only westward in southeastern Texas.