Caulis erectus vel subadscendens, a basi ramosissimus, superne ramosus, pilosus, cr. 15-20 cm longus. Folia alterna, sessilia, anguste lanceolata, apice acuta atque aculeos plures vel singulos gerentia, margine incrassaia, dentibus validis ornata, pilosissima, subinvoluta, cr. 10 mm longa, 1 mm lata. Flores breviler pedicellati, pedicellis fere 2 mm longis, ovarium 3-loculare hemisphaericum usque late sphaericum, 1 mm longum, item crassum, pilosissiraum; calycis laciniae anguste lanceolatae, fere lineares, apice acutae, aculeos plures vel singulos gerentes, margine valde incrassatae, edentatae, subinvolutae, cr. 1 1/2 ram longae, 1/4 mm latae; corolla tubulosa, parum laciniata, laciniis fere idem latis ac altis, apice subacutis, cr. 3 mm longa, laciniis cr. 1 mm longis; filamenti basis anguste lanceolata usque parum dilatata, 4-plo longior quam latior; antherae subelongatae; stilus gracilis, apice haud incrassatus, corollam fere longitudine adaequans; stigmatis lobi 3, tenues, apice subobtusi, subinvoluti. Capsula 3-Iocularis, hemisphaerica usque late sphaerica, 1 1/2 mm crassa, pilosissima, parte superiore anguste conica, subacuta usque cylindrica, calycis laciniis fere 1/3 longitudine adaeqtuante.
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Erect or ascending annual, 150-200 mm tall, branching basally. Leaves alternate, narrowly lanceolate, margin thickened, ± rolled inwards, pilose, toothed. Flowers shortly pedicellate, ovary 3-locular. Capsule hemispherical to broadly spherical, superior part narrowly conical to cylindrical.