• wrigeron canadensis,
• srigeron canadensis,
• drigeron canadensis,
• rrigeron canadensis,
• 4rigeron canadensis,
• 3rigeron canadensis,
• eeigeron canadensis,
• edigeron canadensis,
• efigeron canadensis,
• etigeron canadensis,
• e5igeron canadensis,
• e4igeron canadensis,
• erugeron canadensis,
• erjgeron canadensis,
• erkgeron canadensis,
• erogeron canadensis,
• er9geron canadensis,
• er8geron canadensis,
• eriferon canadensis,
• eriveron canadensis

The adjective form of the word "Erigeron canadensis" is "Erigeron canadensis".

The plural form of "Erigeron Canadensis" is "Erigeron Canadensis" as it is the scientific name of a specific species of flower commonly known as Canadian fleabane. Scientific names do not typically have plural forms.

The singular form of the word "Erigeron Canadensis" is "Erigeron Canadensis". The word already represents a singular noun, which refers to a species of flowering plant commonly known as Canada fleabane.