. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. Fig. 22. Flowers wiih concealed nectar, (i) Trollius europaeus Z-. (2) Lycopus>uropaeus ^. (in outline), n. Nectary. when the petals are fully expanded in the sunshine. Although actinomorphous forms still predominate (e. g. species of Pulsatilla, Trollius, species of Geranium, Erodium, Cardamine pratensis, Cakile maritima, Malva, Rubus, Oxalis, Epilobium, Ribes, Lythrum, Sempervivum, Polemonium, Myosotis, Vaccinium, Calluna, Pyrola, Symphoricarpos, Allium


. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. Fig. 22. Flowers wiih concealed nectar, (i) Trollius europaeus Z-. (2) Lycopus>uropaeus ^. (in outline), n. Nectary. when the petals are fully expanded in the sunshine. Although actinomorphous forms still predominate (e. g. species of Pulsatilla, Trollius, species of Geranium, Erodium, Cardamine pratensis, Cakile maritima, Malva, Rubus, Oxalis, Epilobium, Ribes, Lythrum, Sempervivum, Polemonium, Myosotis, Vaccinium, Calluna, Pyrola, Symphoricarpos, Allium, and others), this class of flowers also includes many species exhibiting more or less well-marked zygomorphism, this indicating a higher deo-ree of floral specialization (e. g. Veronica, Euphrasia, Scrophularia, Lycopus, Orchis Thymus, Mentha, Origanum, and others). White and yellow, colours which predominated in the two first classes of nectar flowers, scarcely appear at all in flowers with completely concealed nectar, but give place to reds, blues, and 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 Knuth, Paul, 1854-1899; Knuth, Paul, 1854-1899; Mu?ller, Hermann, 1829-1883; Ainsworth Davis, J. R. (James Richard), 1861-1934. Oxford : Clarendon Press


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