Compilation
Buchnera longispicata

Annual herbs, 30–42 cm. or more tall, erect to decumbent, branched usually from base; stems subterete, strigose to short patent hirsute. Leaves opposite, almost opposite or alternate, frequently with groups of two or more smaller leaves in axils, 25–35 x 1.5–5 mm., linear to linear-lanceolate, obtuse to subacute, narrowed at base, densely short-hispid with hairs of ten thickened at base, 1-nerved, lowermost leaves of ten with somewhat thickened, revolute margins, scabrid. Inflorescence with flowers crowded at apex, developing into long spike 20–26 cm. long at maturity; flowers sessile, almost opposite. Bracts: lower leaf-like; upper 2–3 x 1–1.4 mm., ovate-lanceolate to lanceolate, acute or acuminate, hispid, slightly concave. Bracteoles 1.25–2 x 0.15–0.4 mm., linear-lanceolate, sparsely hispid. Calyx 5–6 mm. long, clearly 10-ribbed, 5-lobed, densely white pilose with downwardly directed hairs; lobes 1.2–1.5 mm. long, narrowly lanceolate to subulate, spreading after flowering. Corolla blue; tube 8–9 mm. long, funnel-shaped, oblique, slightly curved, appressed retrorse-pilose without, throat densely pilose within; limb 8.5–11 mm. in diam.; lobes 3.5–7 x 2–4 mm., unequal, oblong-obovate to obovate. Capsule 3.5–5 x 1.4–1.8 mm., broadly oblong in outline, subtruncate-emarginate.