Caulis erectus, a basi ramosus, superne subramosus, pilosissimus, cr. 8-10 cm longus. bolia alterna, sessilia, caulem dense investientia, late lanceolata, apice acuta atque aculeos plures vel singulos gerentia, margine valde incrassata, dentibus singulis crassis ornata, haud involuta, pilosissima, cr. 6 1/2-8 mm longa, 1 1/2-2 mm lata. Flores breviter pedicellati, pedicellis 1-2 mm longis; ovarium 3-loculare obovatum, cuneatum, pilosissimum, fere 2 mm longum, 1 1/2 crassum; calycis laciniae, anguste lanceolatae, elongatae, apice aculae atque aculeos plures vel singulos gerentes, margine valde incrassatae, subinvolutae, dentibus singulis ornatae; pilosissimae, 4 1/2-5 mm longae, 1-1 1/2 mm latae; corolla subcampanulata, pauce laciniata, laciniis fere item longis ac latis, apice subacutis, 13 mm longa, laciniis 4 mm longis; filamenti basis, anguste lanceolata, usque linearis, fere 5-plo longior quam latior; anlherae elongatae, apice subacutae; stilus crassus, elongatus, apice haud incrassatus, corollae fere 2/3 longitudine adaequans; stigmatis lobi 3 crassi, apice acuti, subinvoluti. Capsula 3-locularis, obovata, basi subacuta, pilosissima, 3-4 mm longa, cr. 2-2 1/2 mm crassa, parte superiore plane conica, calyce immersa.
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Erect annual, 80-100 mm tall, branched at base and densely pilose. Leaves alternate, narrowly lanceolate, acute, densely covering stem, broadly lanceolate, toothed, margin much thickened, rolled inwards. Flowers shortly pedicellate, in a copiose cyme, subcampanulate, ovary 3-locular. Capsule obovate, hairy, base subacute, upper part conical, hidden in calyx.