Anatomy of the Dicotyledons.
About: This article is published in American Midland Naturalist.The article was published on 1950-11-01. It has received 2511 citations till now.
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TL;DR: The new Sinocarpus material is better preserved and more complete than the type specimen and shows that the inflorescences were compound, perhaps combining alternate and opposite phyllotaxis, and that seeds were arranged in two rows, each row with about ten seeds.
Abstract: Typical angiosperm dicot leaves are discovered closely associated with reproductive organs of Sinocarpus decussatus from the Yixian Formation, NE China. Leaves are of first rank, small, with fine texture, and with distinct petiole and lamina. Venation pattern is craspedodromous, of at least three discrete orders of veins irregularly arranged. Leaf margin is serrate, with glandular teeth of chloranthoid type. The new Sinocarpus material is better preserved and more complete than the type specimen. It yields support for previous interpretations of reproductive characters and shows that the inflorescences were compound, perhaps combining alternate and opposite phyllotaxis, and that seeds were arranged in two rows, each row with about ten seeds. While these new reproductive characters do not provide further resolution to the systematic assignment of Sinocarpus, the associated leaves, believed to be from the same plant, support previous interpretation of Sinocarpus as a basal eudicot, and particularly close to Ranunculales.
55 citations
TL;DR: The first long charcoal sequence at Troubat (Troubat, department of Hautes Pyrenees) has provided the first long-charcoal sequence as discussed by the authors, which offers information concerning the transformations in the vegetation cover due primarily to climate, from the Late Glacial Bolling-Allerod interstadial to the middle of the Post-Glacial four main phases illustrate the changes in vegetation recorded in the charcoal data.
55 citations
TL;DR: Pectic polysaccharides were solubilized from retted hemp bast fibre bundles by sequential extraction with water and ammonium oxalate characterized by chemicals methods, 1H and 13C NMR, as extract as poly Saccharides containing galacturonic acid, rhamnose and galactose units in variable ratios.
55 citations
TL;DR: The results, however, do not support the classification into 10 sections but provide a comprehensive petiole and leaf anatomical and morphological character-set typical for the genus Rondeletia.
Abstract: A comparative anatomical and morphological study on the petioles and leaves of 10 neotropical Rondeletia species (representing 10 sections) has been made in order to investigate interspecific variations which may be useful in species identification. All species have bifacial and hypostomatic leaves, contain tannins and crystal sand. The central vascular bundle in the petiole and the midrib are open to the upper side and are collateral. The species differ in presence or absence of non-glandular trichomes, in the structure of the petiole and leaf blade. A combination of these characters may be useful in species identification. The results, however, do not support the classification into 10 sections but provide a comprehensive petiole and leaf anatomical and morphological character-set typical for the genus.
54 citations
TL;DR: The results do not suppot the hypothesis that the lengths of early wood vessel elements in ring-porous hardwoods change during differentiation, but the similar ranges of recorded lengths suggest that short and long vessel elements might be derived directly from Short and long cambial cells, respectively.
54 citations