
1) Fern genus 2) Garden plant 3) Genus polystichum
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https://www.crosswordclues.com/clue/polystichum

Polystichum is a genus of about 260 species of ferns with a cosmopolitan distribution. The highest diversity is in eastern Asia, with about 120 species in China alone; the region from Mexico to Brazil has nearly 100 additional species; Africa (17 species), North America (15 species), and Europe (5 species) have much lower diversity. Polystichum sp...
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http://en.wikipedia.org/wiki/Polystichum

(Christmas Fern, Holly Fern, Shield Fern) These tender and hardy Ferns (Holly Ferns) are found in many parts of the world, especially in tropical America, North America, Europe, tropical Asia, Japan and South Africa. The fronds of these Ferns vary in length from 2 to 4 feet. P. aculeatum 'Pulcherrimum' has arching, evergreen or semi-evergreen, rigi...
Found on
http://www.encyclo.co.uk/local/10004

[
n] - small to medium-sized terrestrial ferns especially holly ferns
Found on
http://www.webdictionary.co.uk/definition.php?query=Polystichum
genus Polystichum noun small to medium-sized terrestrial ferns especially holly ferns; in some classification systems placed in Polypodiaceae
Found on
https://www.encyclo.co.uk/local/20974
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