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Calyx 7–8.5(13) mm. long, prominently 10-nerved, stipitate-glandular mixed with short white hairs on nerves; lobes 1–1.75 mm. long, subequal, broadly triangular, obtuse, shortly hispid on margin.
Erect or decumbent annual herb, 6–14 cm. tall, simple or with branches up to 20 cm. long; branches mostly opposite, widely spreading, leafy.
Stamens subequal; filaments 3–6 mm. long, somewhat heavily bearded; anthers c. 1.5 mm. long, ellipsoid, apiculate.
Corolla yellow, (10)15–19 mm. long, subdensely short glandular-pilose without; lobes 4–5 mm. long, rounded.
Bracteoles c. 6 x 0.5 mm., narrowly linear, minutely hispid on margin.
Flowers solitary in axils of leaf-like bracts, pedicellate.
Bracts similar to leaves, longer or shorter than flowers.
Capsule c. 11 x 7 mm., broadly ovoid, obtuse.
Pedicels 1–3(5) mm. long, slender.
