M. horridus stems are a slightly gray-green color and densely pubescent. The leaves differ from M. fabaceus by having more smaller hairs and deeper, rounded lobes. In addition, M. horridus leaves are less shiny that other species.
M. horridus flowers are generally white with flat petals and have a rough surface. Male M. horridus flowers are the most bell-shaped of the genus and hang from the bloomstem on short curved stems. Female flowers appear singly at the base of the male bloomstem and are less bell-shaped.
The densly prickled fruit of M. horridus are the largest of the genus and hang from the vines on long stems. The smooth, hard seeds are also the largest of the genus and taper to a pointed end. Like all manroot, the fruit swells as it ripens before ejecting the large seeds.
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