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The three lower petals curve back slightly and are on average 17 mm (0.65 in) long and 6 mm (0.25 in) wide (full range 13½–21 mm × 3½–7½ mm). The ten filaments are merged into a tube of about 2 mm (0.08 in) long, the free parts of the filaments varying in length within the same flower, between 2 and 11 mm (0.08–0.45 in) long.
The wings are longer than and enclose the two bottom petals, which are together called the keel. The two keel petals form a boat-like structure, with a blade of 7–8 mm (0.28–0.31 in) long and 2–3 mm (0.079–0.118 in) wide and a claw of 3–3.5 mm (0.12–0.14 in) long. the keel blade is adorned with 30–35 ridges in the upper tip portion.
The two bottom petals have long claws and are tinged purple at the blunt tip, are free at the base but fused together at their tip and they form a boat-like structure called the keel. In Otholobium, the keel is much shorter than the wings. The keel contains 10 identically shaped filaments, 9 are fused while 1 is partially free.
The calyx, moreover, may or may not be persistent, is rarely acrescent (i.e. continuing in the fruit), imbricate or valvate. The corolla is composed of 5 free petals (commonly less than 5 or absent in Swartzieae, Amorphieae and Caesalpinioideae, or 3 to 4 in Mimosoideae) or partially united and presents, in general, a characteristic morphology.
K 3+3 – a calyx with six free sepals, arranged as two separate whorls; A∞ – many stamens; P3–12 – perianth from three to twelve petals; Groups of organs can be described by writing the number of instances in the group as superscript. A5² – 5 groups of 2 stamens. The formula can also express organ fusion.
Among the distinguishing characters of the genus are two series of stamens totaling twice the number of petals; free or nearly free petals (not joined in a tube); a stout rhizome from whose axils the flowering stems rise; and a basal rosette of leaves. This genus contains the only species of Crassulaceae that have unisexual flowers. [4] [7]
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It differs from other Lobelioideae in that it has regular (actinomorphic) flowers with virtually free petals, and is dioecious. [citation needed] It contains the following species, accepted as of July 2014: [1] Dialypetalum compactum Zahlbr. Dialypetalum floribundum Benth. in G.Bentham & J.D.Hooker; Dialypetalum humbertianum E.Wimm. in H.G.A.Engler