Ambrosia maritima L., it is an annual plant, up to 20-60 cm tall, hairy-cane-like, with a penetrating odor. Branched stem, densely hairy. Leaves ash-green above, whitish-hairy below, petiolate, oval in their outline, bipinnatipartite or pinnatipartite, with pinnatifid segments, with obtuse lobes. Inflorescences are in spikes or terminals racemes formed by small capitulums of two types: Male sessile capitulums or slightly stalked and bending, about 3 mm in diameter with an obconical-campanulate involucre; female sessile capitulums, solitary or in clusters on the axils of upper leaves. Involucre of female capitulums have some short, thick spikes on the top, extended like a beak around the style and tightly wrapping the smooth obovoid. Fruits small (4 mm long), almost as wide as long, grooved-rugose, with towards the middle a whorl of 4-6 short spreading-erect spines, almost truncate at the top, ending in a slightly bifid beak.
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