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Weeds: 1) Field horsetail, (Equisetum arvense), sporangium (a), spur (b+c), stem cross section (d); 2) Red sorre (Rumex acetosella), blossom (a), ovary (b), fruit (c); 3) Canadian horseweed (Erigeron canadensis, or Erigeron canadense), leaves (a+b), fruit wit pappus; 4) Field bindweed (Convolvulus arvensis), blossom intersected (a), fruit (b), seed (c); 5) Knotgrass (Polygonum aviculare), stem with leaf sheath (a), blossom (b), fruit (c); 6) Coltsfoot (Tussilago farfara), edge blossom (a+b), disc flower (c+d), fruit with pappus; 7) Wild radish (Raphanus raphanistrum), petal (a), fruit (b), seed (c); 8) Charlock mustard (Sinapis arvensis), blossom (a), fruit (b), seed (c); 9) Eastern groundsel (Senecio vernalis), edge blossom (a), fruit with pappus (b); 10) Creeping thistle (Cirsium arvense), male (a) and female blossom (b), fruit with pappus (c), papus bristle (d); 11) Annual nettle (Urtica urens), stinging hair (a) blossom (b), fruit (c); 12) Potato weed (Galinsoga parviflora), blossomcrown (a), edge blossom (b), disc flower (c). Wood engravings, published in 1897.