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Useful and medicinal plants, top: Mullein (Verbascum densiflorum, or Verbascum thapsiforme), a+b-plant, c-calyx and pistil, d-flower crown, cut open, e-ovary (cross section), A-base of Verbascum nigrum; Hogweed (Heracleum sphondylium), a-root, b-sheath-shaped leaf, c-umbel-bearing branch, d-radiant marginal bloom, e-middle bloom, f-double fruit, g-double fruit (longitudinal and cross section). Below: Strawberry clover (Trifolium fragiferum), a-plant with blossoms and fruits (shown reduced), b-single blossom, c-inflated single fruit, d-fruit head; Broadleaf pondweed (Potamogeton natans), a-plant (shown reduced), b-single blossom, c-fruit. Wood engravings, published in 1884.