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Sesbania punicea (Spanish gold, rattlebox, or scarlet sesban) is an ornamental shrub with reddish-orange flowers native to South America. [2] It has deciduous leaves and grows to a height of 15 feet (4.5 m).
As in most Faboideae, the corolla is zygomorphic, forms a specialized structure and consists of five free petals. The upper petal, called the banner or standard is elliptic, 9–10 mm (0.35–0.39 in) long and about 7–8 mm (0.28–0.31 in) wide, white with a green nectar guide at the very base extending from the claw of only about 1 mm (0.039 ...
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 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.
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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