hard fern造句

• Marsh violet and hard fern ( both London rarities ) occur in the damper areas.
• The teeth indicate a diet of hard ferns and grasses that still grow in the alpine meadows of the area ( Long " et al " ., 2002 ).
• ""'Blechnum chambersii " "', is a species of hard fern within the family Blechnaceae, found in Australia, New Zealand, Samoa and Fiji.
• ""'Blechnum " "'( "'hard fern "') is a genus of between 150 220 species of ferns with a cosmopolitan distribution, in the family Blechnaceae in the eupolypods II clade of the order Polypodiales.