Penstemon cyananthus. Plate from ‘Field Book of Western Wild Flowers’ (1915) by Margaret Armstrong

Penstemon cyananthus. Plate from ‘Field Book of Western Wild Flowers’ (1915) by Margaret Armstrong

Arizona Thistle. Plate from ‘Field Book of Western Wild Flowers’ (1915) by Margaret Armstrong.

Arizona Thistle. Plate from ‘Field Book of Western Wild Flowers’ (1915) by Margaret Armstrong.

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