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  • 1
    Electronic Resource
    Electronic Resource
    Die Stipeln derIrvingioideae undRecchioideae und ihre systematische Wertung nebst Bemerkungen zur Holzanatomie und Palynologie (1980)
    Springer
    Plant systematics and evolution 133 (1980), S. 261-283 
    Details
    ISSN: 1615-6110
    Keywords: Simaroubaceae ; Irvingiaceae ; Ixonanthaceae ; Erythroxylaceae ; Irvingia ; Klainedoxa ; Desbordesia ; Allantospermum ; Ochthocosmus ; Cadellia ; Guilfoylia ; Recchia ; Stipules ; pseudostipules ; metastipules ; wood anatomy ; palynology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract TheSimaroubaceae generally have no true stipules. The stipule-like appendages of some genera proved to be pseudo- or metastipules (Weberling & Leenhouts 1965). There seem to be some exceptions, however: the generaCadellia (incl.Guilfoylia) andRecchia on the one hand, and theIrvingioideae on the other. As these taxa, with exception ofRecchia, have simple leaves, there are no indications that their stipule-like appendages might be pseudo- or metastipules. In regard to their position and ontogeny these appendages behave completely like true stipules. Assuming the view ofForman, one could conceive a morphological line from the long, broadly inserted axillary stipules of mostIrvingioideae to the small scaly triangular stipules ofIxonanthoideae. The similarities between the stipules ofIrvingioideae andErythroxylaceae (already emphasized byHallier and others), become even more evident when their ontogeny is investigated. TheIrvingioideae, therefore, might be regarded as a separate family (perhaps with some relation to theErythroxylaceae,Hallier) or as a subfamily ofIxonanthaceae (Forman).—In addition to data on stipules some results on the palynology and shoot anatomy of the generaCadellia (incl.Guilfoylia) andRecchia are reported. Their relationship with theSimaroubaceae also appears doubtful. If they are to be included, they represent a somewhat isolated group near the base of the family which otherwise has lost its stipules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984383
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  • 2
    Electronic Resource
    Electronic Resource
    Transfer cells and lipid droplets of someValerianaceae (1990)
    Springer
    Plant systematics and evolution 170 (1990), S. 37-51 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Valerianaceae ; Transfer cells ; lignification ; lipid droplets ; oil cells ; tannins ; Development ; structure ; axial distribution ; transmission electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Development, structure and the axial distribution of transfer cells and their lignification were investigated inValerianella locusta, Valeriana officinalis, andV. tuberosa (Valerianaceae). Fundamental new results are: (1) Transfer cells often contain numerous lipid droplets. Within the stem the distribution of cells containing lipid droplets correlates to that of transfer cells. (2) InValeriana officinalis persisting protuberances are frequently found on pit membranes of xylem transfer cells. Lignified transfer cells can undergo a second modification: a layer covering the secondary wall forms wall ingrowths similar to those of transfer cells. (3) Peripheral pith cells, abuting transfer cells, are able to modify into transfer cells. Cambial derivatives are only temporarily developed as transfer cells. (4) Phloem transfer cells are found in vascular bundles of the whole axis. (5) In roots, xylem transfer cells are poorly developed or absent. (6) Oil cells with oil bodies are present in the rape ofValeriana tuberosa. They are absent however in the stem of the species investigated. (7) Tannins occur in elements of the primary cortex, phloem and secondary xylem ofValeriana officinalis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937848
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  • 3
    Electronic Resource
    Electronic Resource
    Transferzellen im Xylem derValerianaceae (1987)
    Springer
    Plant systematics and evolution 156 (1987), S. 69-89 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Valerianaceae ; Xylem transfer cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Stems, incl. rhizomes, and roots of 42 species ofValerianaceae were investigated in order to reveal the occurrence, structure and distribution of xylem transfer cells. Within nodes and internodes their frequency, distribution and gradients of development are similar to other families. — Within the secondary xylem of some species transfer cells can develop from cambial derivates, inValeriana tuberosa andPatrinia villosa even from pith cells. Within the turnip ofV. tuberosa transfer cells are very frequent and well developed. Here, after degradation of the cell-wall ingrowths they can be redifferentiated into storage cells which usually contain starch grains (“Hüllenstärkekörner”). In the transitional zone between stem and root of some predominantly herbaceous taxa transfer cells are often very frequent and form large protuberances before they degrade and lignify. SEM observations inValeriana decussata show that the cell-wall ingrowths are degradated at the beginning of lignification with the exception of brush-like protuberances remaining in the half-bordered pit-pairs. During the subsequent process of lignification the simple pits of a wall adjacent to a vessel can be transformed into corresponding pit-pairs. In this case the residues of the protuberances within the pit chamber can be transformed into incrustations similar to the vestures of bordered pits described byBailey (1933). Structural similarities between the brush-like protuberances in the half-bordered pits of theValeriana transfer cells and the ingrowths found inLauraceae (Castro 1982, 1985) are evident. Supposedly, all the cambial derivatives inValerianaceae can develop protuberances at least within their pits. Thus, it appears possible to interpret the vestures of the bordered pits as rudimentary protuberances, and to suggest that they have a specific function in the selective transport of solutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937203
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