Corolla pentapetala, irregularis, petalis inæqualibus; quorum.
Petalum α. supremum rectum, deorsum spectans, latius, obtusius, emarginatum, desinens basi in nectarium corniculatum, obtusum, inter calycis foliola prominens.
β. γ. Lateralia paria, obtusa, opposita, recta.
δ. ε. Insima paria, majora, sursum reflexa.
Stamina. Filamenta quinque, minima, quorum duo petalo α. proxima appendicibus annexis intrant nectarium. Antheræ sæpius connexæ, obtusæ, membranis ad apicem auctæ.
Pistillum. Germen subrotundum. Stylus filiformis, extra antheras prominens. Stigma obliquum.
Pericarpium. Capsula ovata, trigona, obtusa, unilocularis, trivalvis.
Semina plura, ovata, appendiculata, valvis affixa. Receptaculum lineare, per singulam valvulam lineæ instar excurrens.
Obs. Stigma vel in hamum simplicem reflectitur, vel capitulum est concavum apice perforato.
Cup five-leaved, short, permanent; leaflets oblong-egg-shaped, erect, sharpish at the point, blunt at the bottom, joined together above the base, equal, but variously disposed; of which, two support petal α. one each petal β. γ. and one the two petals δ. ε. together.