A genus of brown seaweed or kelp found in the North Atlantic, characterized by air bladders and branching fronds, commonly called rockweed.
From Greek askos (wineskin, bladder, referring to the air sacs) + phyllon (leaf). Named by botanists in the 1800s because the air-filled bladders resemble tiny wineskins helping the plant float.
Ascophyllum is rockweed's scientific name, and those air bladders that keep it afloat are literally named after wineskins because 19th-century scientists saw the resemblance—sometimes the oldest comparisons are the best ones!
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