William Marriott Canby

Astragalus tweedyi, or Tweedy's milkvetch, is a perennial herb in the pea family. It is native to Washington and Oregon in the Pacific Northwest of the United States.

Erigeron tweedyi, or Tweedy's fleabane, is a perennial herb in the family Asteraceae. It is native to the Rocky Mountains in Montana, Idaho and Wyoming.

Erigeron parryi is a species of flowering plant in the family Asteraceae known by the common name Parry's fleabane. It is native to the Rocky Mountains of southern Montana and northern Wyoming. Erigeron parryi is a small perennial herb rarely more than 15 centimeters (6 inches) tall, producing a woody taproot. The leaves are covered with wool. The plant generally produces only 1 flower head per stem, though occasionally 2 or 3. Each head has 20–40, pink, or blue ray florets surrounding numerous yellow disc florets. The plant grows on rocky limestone slopes, frequently alongside sagebrush.

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Chionophila tweedyi, or Tweedy's snowlover, is a perennial herb in the plantain family. It is native to Idaho and Montana in the western United States.

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Cirsium pumilum var. hillii is a type of thistle endemic to North America. The common name for this plant is Hill's thistle.

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