. College botany; structure, physiology and economics of plants. Botany. SEEDS AND SEEDLINGS 127. Fig. 89.—Weed seeds: 1, Night-flowering catchfly iSilene erectifolia); 2, sheep's sorrel {Rumex acetoseUa); 3, curled dock {Rumex crispus); 4, Pennsylvania smartweed {Polygonum pennsylvanicum) 5, lamb's quarter (Chenopodium album); 6, tumbling pigweed {Ama- ranthus retroflexus); 7, peppergrass {Lepidiujn virginicum); .8, field cress iLepidium camr- pestre)', 9, yellow trefoil {Medicago lupulijia); 10, evening primrose {Onagra biennis); 11, wild carrot {Daucus carota); 12, Rugel's plantain {Plant
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. College botany; structure, physiology and economics of plants. Botany. SEEDS AND SEEDLINGS 127. Fig. 89.—Weed seeds: 1, Night-flowering catchfly iSilene erectifolia); 2, sheep's sorrel {Rumex acetoseUa); 3, curled dock {Rumex crispus); 4, Pennsylvania smartweed {Polygonum pennsylvanicum) 5, lamb's quarter (Chenopodium album); 6, tumbling pigweed {Ama- ranthus retroflexus); 7, peppergrass {Lepidiujn virginicum); .8, field cress iLepidium camr- pestre)', 9, yellow trefoil {Medicago lupulijia); 10, evening primrose {Onagra biennis); 11, wild carrot {Daucus carota); 12, Rugel's plantain {Plantago Rugelii); 13, buckhorn {Plan^ toga Uinceolata); 14, ox-eye daisy (ChrysanthemuTn leucanthemum); 15, Canada thistle {Cni- cus arvensis); 16, bull thistle (Cnicus lanceolatus); 17, yarrow {Achillea m.illefolium); 18, dandelion {Taraxacum officinale); (a) ventral side; (fc) dorsal side- 1, Csiryophyllaeeae; 2-4, PolygnaceEB; 5, Chenopodiace£e; 6, Amaranthaceae; 7-8, Cruciferffi; 9, Leguminosie; 10, Anagracese; 11, Umbelfifersp; 12-13, Plantaginacesp; 14-18, Compositse.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Cook, Melville Thurston, 1869-1952. Philadelphia and London, J. B. Lippincott Company