Sesbania exaltata (bigpod sesbania, "Amerikatsunokusanemu")

Japanese name: アメリカツノクサネム
Scientific name: Sesbania exaltata

[Overview]
An annual reaching 1–3 m tall, seen in vacant lots and similar places.
The stem is erect, with few branches.
The leaves are alternate and even-pinnately compound, 10–30 cm long, consisting of 15–30 pairs of leaflets.
The leaflets are oblong, about 1–2.5 cm long, with entire margins.
Racemes shorter than the leaves arise from the leaf axils and bear several flowers sparsely.
The flowers are yellow, pea-shaped, about 1.5 cm long, and often have reddish-purple mottling on the outside.
The fruit is linear, 15–20 cm long and about 0.5 cm wide, and contains many seeds.

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