Hortus botanicus Exotic Aliens

Hortus botanicus Exotic Aliens is a series of gouache on paper works that document common invasive alien plants in the short-grass prairie region where I live in Southern Alberta. These plants are classes as "exotic aliens". Not all alien species become invasive, but these ones have. I am interested in how the language used to classify these plants is reminiscent of the language used to classify people from other countries in Canada and the United States. They are not aliens in the places they come from, there they are considered plants, or possibly wild flowers. Here they are probably thought to be weeds and problems for agricultural production. Ironically, many are sold in garden centres as plants for perennial gardens. 

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Black Henbane - Hyoscyamus niger
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Blueweed 1 - Echium vulgare
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Blueweed 2 - Echium vulgare
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Hortus botanicus / Exotic Aliens - Installation View
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Blueweed 3 - Echium vulgare
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Bighead Knapweed - Centaura macrocephala
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Black Knapweed - Centaurea nigra
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Bighead Knapweed 2 - Centaura macrocephala
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Canada Thistle 1 - Cirsium arvense
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Canada Thistle 2 - Cirsium arvense
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Common Mullein - Verbascum thapsus
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Common Baby’s Breath - Gypsophila paniculata
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Common Tansy - Tanacetum vulgare
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Creeping Bellflower - Campanula rapunculoides
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Dalmatian Toadflax - Linaria dalmatica
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Hound’s Tongue 2 - Cynoglossum officinale
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Leafy Spurge - Euphorbia esula
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Medusahead - Taeniatherum caput‑medusae
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Purple Loosestrife 1 - Lythrum salicaria
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Purple Loosestrife 2- Lythrum salicaria
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Spotted Knapweed 2 - Centaurea stoebe
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Spotted Knapweed 1 - Centaurea stoebe