Calyx. Perianthium pentaphyllum; foliolis lanceolatis, canaliculato-concavis, erectis, acutis, conniventibus in tubum, persistentibus.
Corolla. Petala quinque, unguibus longis, linearibus, rectis, conniventibus, reflexo-patentibus.
Nectaria quinque; singulum squamula minima, emarginata basi germinis extrorsum annexa.
Stamina. Filamenta quinque, subulata, longitudine tubi, unguibus corollæ inserta. Antheræ simplices.
Pistillum. Germina quinque, oblonga, acuminata, desinentia in stylos subulatos, longitudine staminum. Stigmata obtusa.
Pericarpium. Capsulæ quinque, oblongæ, acuminatæ, rectæ, compressæ, longitudinaliter introrsum dehiscentes.
Semina plura, parva.
Empalement. Cup of five leaves; the small leaves are lance-shaped, concave and channelled, upright, sharp, formed into a tube, and remaining.
Blossom. Petals five, claws long, linear, upright, joined together, bent back, and spreading.
Honey-cups five, each consisting of a small scale notched at the end, and fixed on the outside the base of each seed-bud.