

How to identify Bristly locust (Robinia hispida)
Bristly locust, also known as Moss locust, Standing sweat pea
Bristly locust is distinguished by its vibrant, pendulous pink flower clusters, resembling those of peas, that bloom in spring. Its leaves are compound, contributing to its aesthetic appeal, especially when they turn yellow in the fall. The plant's size ranges from 2-10 feet (0.61-3.05 meters) in height with a generous spread of 5-15 feet (1.52-4.57 meters). A characteristic feature is the purplish bristly hairs that cover its stems and branches, along with spines located at the leaf stems' bases.
Vibrant pendulous pink flower clusters resembling peas.
Compound leaves turning vivid yellow in the fall.
Distinct bristly purple flat seed pods, 2-3 inches (5-7.6 cm) long.
Purplish-brown bristly hairs covering stems and branches.
Smooth bark with a reddish-brown hue, displaying subtle vertical ridges.
The leaves of bristly locust are alternate, pinnate compound and blue-green, exhibiting a vivid yellow hue in the fall. Each leaf measures approximately 0.5–1 foot (15–30 cm) in length and is odd-pinnate, containing 7-15 oval leaflets. These leaflets are 1-2 inches (2.5–5 cm) long and 0.5-1 inch (1.3–2.5 cm) across, with rounded tips and bases. Notably, two sharp spines are present at the base of each leaf stem, providing a distinct identification feature.
The flowers of bristly locust are notable for their striking pink to bright rose hues. Each flower is pea-like, approximately 1 inch (2.5 cm) across, with five distinct petals. They are arranged on pendulous racemes measuring 2 to 4 inches (5 to 10 cm) long, blooming in mid-spring from April to June. The flowers feature a calyx covered with purple-brown bristly hairs and five visible teeth, which add to their unique texture and appearance.
The stems of bristly locust are distinguished by their purplish-brown bristly hairs, giving them a unique and rough texture. These hairs cover the entire length of the stem, often appearing dense and prominent. The color of the stem underneath the hairs is typically a greenish hue. Stems are moderately thick, measuring approximately 0.5 inches (1.27 cm) in diameter, and exhibit a somewhat irregular branching pattern. These physical characteristics make the stems of bristly locust easily recognizable.
The fruit of bristly locust is a distinct bristly purple flat seed pod, measuring about 2-3 inches (5-7.6 cm) in length. Each pod typically houses 3-5 seeds within its confines. This leguminous fruit is textured with fine, hair-like bristles that contribute to its unique tactile quality. The pods develop from its flowers and, when mature, they exhibit a purple to purplish-brown hue, making them visually notable. These characteristics are essential for identification and help distinguish the fruit from other similar species.
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Scientific Classification of Bristly locust