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Useful and medicinal plants, top: Hog's fennel (Peucedanum officinale), a-head of the root with the lock of hair, leaf apex, and inflorescence, b-blossom, c-seed head and single double fruit, d-half fruit (cross section, enlarged); Bog asphodel (Narthecium ossifragum), a-flowering plant, b-seed head, c-petal with stamen (enlarged), d-seed capsule (cross section, enlarged); Wild teasel (Dipsacus fullonum, or Dipsacus sylvestris), flowering plant (main character), 1-flower head (cross section), 2-single bloom with support sheet, 3-single bloom (longitudinal section), 4-7-fruit, longitudinal and cross section, 8-seed; Sea holly (Eryngium maritimum), 1-single blossom, 2-3-anther and filament, 4-fruit with surviving calyx, 5-6-fruit, longitudinal and cross section, 7-seed, 8-seedling. Below: Cross gentian (Gentiana cruciata), a+b-plant, c+d-parts of the flower crown and the calyx (enlarged); Neptune grass (Posidonia oceanica, or Posidonia caulini), a-flowering plant, b-root, c-staminate flower, d-filament, e-pistillate flower; Marsh mallow (Althaea officinalis), a-flowerin twig, b-root, c-pistil, d-stamen, e-stigma (enlarged), f-calyx, g-k-entire and single fruit; Beet (Beta vulgaris), a-part of the plant, b-blossom, c-fruit branch, d-fruit (enlarged), e-root (shown reduced). Wood engravings, published in 1884.