Herba annua, erecta, a basi ramosa ramis patenti-ascendentibus vel suberectis. Caules et rami inferne glabri, ad basin usque acute quadranguli, foliati, superne (in inflorescentia) sparsim glanduloso-puberuli. Folia caulina opposita, subglabra, inferiora ovato-elliptica, breviter petiolata, obtusa, subintegerrima; media triangulari-lanceolata, sessilia, apicem versus attenuata sed obtusa vel obtusiuscula, basin versus dilatata, ipsa basi rotundata vel brevissime et latissime cuneata, interdum subamplexicaulia, integerrima vel levissime repando-denticulata. Racemi in caule et in ramis terminales, satis breves et pauci-(7-12-) flori, fructiferi paullum elongati; bracteae alternantes, infimae foliis caulinis similes, ceterae breves, triangulari-ovatae, basi plerumque subcordatae, pedicellismulto breviores; pedicelli erecto-patentes, tenues, (sicut racemorum axis) glanduloso-puberuli. Flores pro genere sati speciosi. Calycis lobi lineari-elliptici, obtusiusculi, minute glandulosi. Corollae labium superius pallide purpureo-violaceum, lobis anguste oblongis, trinerviis, apicem versus sensim attenuatis, ipso apice obtusis; labium inferius superiore brevius, palato (barbato) et fauce aurantiacis, calcare satis longo, parte ejus cylindrica recta obtusa. Capsula compressa, oblongo-ovoidea, basi subinaequaliter rotundata, sub apice leviter constricta et inde apice levissime bicornuta, latissime et obtusissime emarginata marginibus emarginaturae valde divergentibus fere rectis, marginibus loborum exterioribus leviter concavis. Semina generis, fusca.
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Annual, up to 300 mm tall. Leaves ovate, toothed to nearly entire. Flowers in lax racemes, calyx lobes lanceolate, glandular pubescent, corolla 15-20 mm long, greyish magenta, upper lip with greenish yellow rectangular spot at base, lower lip with convex palate at base, upper surface of palate greenish yellow, with two diverging glabrous bosses, spurs projecting backwards, ± straight, pinkish white. Capsule oblong to oblong-ovate.
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