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  • 1
    Electronic Resource
    Electronic Resource
    Foliar anatomy ofPolygonum (Polygonaceae): Survey of epidermal and selected internal structures (1992)
    Springer
    Plant systematics and evolution 182 (1992), S. 71-106 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; dicotyledons ; Polygonaceae ; Polygonum ; Crystals ; extrafloral nectaries ; leaf anatomy ; secretory structures ; stomata ; subepidermal fibers ; trichomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several anatomical characters in leaves were described, and their distribution determined, for 153 species ofPolygonum, mostly from herbarium specimens. Structures surveyed were epidermal (glandular and nonglandular trichomes, nodules, specialized parenchyma, stomatal apparatus) and internal (cavities, crystals, laticifer-like cells, nodules, subepidermal fibers). Cleared leaves were supplemented by resin-embedded sections and SEM preparations of selected species. No feature defines any taxonomic section, but some features occur only within one section. Laticifer-like cells, epidermal and internal nodules, resin cups, and unique epidermal and subepidermal cavities seem to be unknown elsewhere; other features (invaginated epidermal cells; enlarged crystal cells confined to paraveinal layer) are rare among angiosperms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00941415
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  • 2
    Electronic Resource
    Electronic Resource
    Invasive tapetum and tricelled pollen inAmbrosia trifida (Asteraceae, tribeHeliantheae) (1990)
    Springer
    Plant systematics and evolution 169 (1990), S. 237-243 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Asteraceae ; Heliantheae ; Ambrosia ; Anther ; crystals ; pollen ; sperm cells ; tapetum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Staminate flowers of giant ragweed,Ambrosia trifida L. (Asteraceae, tribeHeliantheae, subtribeAmbrosiinae) were processed into resin and sectioned 1–2 µm thick. The invasive (amoeboid) anther tapetum remains parietal until microspores are released from tetrads, then it swells and invades the locule, merging gradually into a single protoplast that flows among the microspores. After the tapetal membrane ruptures at late microspore stage, tapetal debris fills the locule, then disappears as pollen matures. Pollen becomes tricelled before anthesis. The two sperm cell nuclei are slender and wormlike. The present report supports the two generalizations that invasive tapetum and tricelled pollen are attributes of theAsteraceae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937677
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  • 3
    Electronic Resource
    Electronic Resource
    Laminar hydathodes inUrticaceae: Survey of tribes and anatomical observations onPilea pumila andUrtica dioica (1991)
    Springer
    Plant systematics and evolution 176 (1991), S. 179-203 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; dicotyledons ; Urticaceae ; Pilea pumila ; Urtica dioica ; Guttation ; hydathodes ; leaf anatomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laminar hydathodes are known from only three dicot families. InUrticaceae they are associated with minor vein junctions in all five tribes, as surveyed from cleared leaves of 43 species in 30 genera. Only one species lacked hydathodes. Exclusively adaxial hydathodes were found in 28 genera. In tribeElatostemeae, laminar hydathodes inPilea andPellionia species are abaxial, adaxial, or on both surfaces. Guttation was observed in four species.Urtica dioica (adaxial) andPilea pumila (abaxial) were studied anatomically in detail. Hydathodes in the former have normal bundle structure but xylem gaps sometimes occur. In the latter, phloem is displaced in three previously undescribed ways: 1) ends abruptly near hydathode, 2) curves into connecting vein at adjacent junction, or 3) departs xylem, skirts hydathode independently, and rejoins adjacent xylem strand. Laminar hydathodes are a unifying character of theUrticaceae, and they also strengthen its close relationship to theMoraceae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937906
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