
1) Genus sium 2) Rosid dicot genus
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https://www.crosswordclues.com/clue/sium

Sium is a genus of flowering plants in the family Apiaceae. It is widely distributed across Europe, Asia, Africa, and North America. Plants of this genus are commonly called water parsnips. These are perennial herbs, including some fully aquatic plants and some species that grow near water. The branching stem roots at the nodes. The lower leaves a...
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http://en.wikipedia.org/wiki/Sium

(Skirret, Water Parsnip) This vegetable, the Skirret or Water Parsnip, was once popular in the American colonies, but is rarely grown now. If you enjoy Root Parsley and Salsify, you should try Skirret. This hardy perennial provides a cluster of knobby, sweet tasting roots in the autumn and winter, from which grow rosettes of feathery leaves.…...
Found on
http://www.encyclo.co.uk/local/10004

[
n] - perennial of wet and marshy places in the northern hemisphere: water parsnips
Found on
http://www.webdictionary.co.uk/definition.php?query=Sium
genus Sium noun perennial of wet and marshy places in the northern hemisphere: water parsnips
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.