The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 257
... pistil with short stamens , the other a short pistil with long stamens ; the two having differently sized pollen- grains . With trimorphic plants there are three forms likewise differing in the lengths of their pistils and stamens , in ...
... pistil with short stamens , the other a short pistil with long stamens ; the two having differently sized pollen- grains . With trimorphic plants there are three forms likewise differing in the lengths of their pistils and stamens , in ...
Стр. 406
... pistil , with an hermaphrodite species , hav- ing of course a well - developed pistil , the rudiment in the hybrid offspring was much increased in size ; and this clearly shows that the rudimentary and perfect pistils are essentially ...
... pistil , with an hermaphrodite species , hav- ing of course a well - developed pistil , the rudiment in the hybrid offspring was much increased in size ; and this clearly shows that the rudimentary and perfect pistils are essentially ...
Стр. 465
... pistil in flowering plants . STIPULES - Small leafy organs placed at the base of the footstalks of the leaves in many plants . STYLE . The middle portion of the perfect pistil , which rises like a column from the ovary and supports ...
... pistil in flowering plants . STIPULES - Small leafy organs placed at the base of the footstalks of the leaves in many plants . STYLE . The middle portion of the perfect pistil , which rises like a column from the ovary and supports ...
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adapted admit affinity ancient animals appear Archipelago areas become believe belonging birds Cambrian characters classification climate closely allied species common continent creation crustaceans degree deposits descent with modification developed difficulty distant distinct species domestic doubt embryo Europe existing extinct facts faunas fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important INDIANENSIS individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammæ mammals manner marine Marsupials MDCCCXX migration modified descendants mongrels mountains natural selection naturalists nearly oceanic islands offspring parent peculiar perfect pistil plants pollen present probably produced progenitor quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds SIGILLUM Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory of natural tion variations varieties VERITAS whole widely different