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Journal ArticleDOI

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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Journal ArticleDOI
TL;DR: Several distinctive histological features of the stamen, especially of the filament, are described, some of these for the first time, and probably promote a rapid loss of water or a disruption of the water supply to the anther, and therefore might facilitate anther dehiscence.

64 citations

Journal ArticleDOI
TL;DR: Extrafloral nectaries (EFNs) are of ecological, evolutionary and taxonomic importance in many plants, but are often overlooked in botanical descriptions and have rarely been studied in humid Australian forests.
Abstract: Extrafloral nectaries (EFNs) are of ecological, evolutionary and taxonomic importance in many plants, but are often overlooked in botanical descriptions and have rarely been studied in humid Australian forests. We examined EFNs in a tropical rainforest in northern Queensland, Australia. A total of 29 plant species was found bearing EFNs within the 1-ha study plot at the Australian Canopy Crane Project and an additional 10 EFN species were found in rainforests and other habitats outside, but nearby, the plot. The records include 12 genera in which EFNs have not been previously reported (Ardisia, Bambusa, Castanospermum, Dysoxylum, Melicope, Flagellaria, Glochidion, Ichnocarpus, Merremia, Rockinghamia, Syzygium, Wrightia), including one new family (Flagellariaceae). In the study plot, 13 tree species (17% of tree species with dbh >10 cm), 10 climbing plant species (21%) and six shrubs had EFNs, a similar proportion compared with tropical forests on other continents. Morphology of most EFNs was studied by using scanning electron and light microscopy. Extrafloral nectaries were assigned to five different structural types (sensu Zimmermann 1932): flattened, elevated, pit, scale-like and formless nectaries. EFNs from all species were regularly visited by ants, allowing detection of many otherwise inconspicuous nectaries.

64 citations

Journal ArticleDOI
TL;DR: Analysis of sequence data for five Rutaceae subfamilies has shown that there is no molecular support for the current subfamily classifications within the Rutaceae, suggesting a reassessment of the subfamily classification is necessary.
Abstract: DNA sequencing has been used to construct two molecular phylogenies at the intrafamily and intrageneric level within the Rutaceae Analysis oftrnL-trnF sequence data for five Rutaceae subfamilies has shown that there is no molecular support for the current subfamily classifications within the Rutaceae The Dictyolomatoideae and Spathelioideae belong to a clade separate from the clades containing the remaining Rutaceae subfamilies Rutoideae and Citroideae do not form discrete clades which suggests a reassessment of the subfamily classification is necessary, particularly asRuta falls within the majority Citroideae clade Flindersioideae forms a clade within the Rutaceae and does not form a separate family or form a clade with Meliaceae Sequencing of 17Flindersia species produces a similar phylogeny to that proposed by other authors using morphological methods with two exceptions The molecular phylogeny indicatesF amboinensis is associated withF fournieri andF laevicarpa and, in addition,F oppositifolia andF pimenteliana were found to be genetically identical

63 citations

Book ChapterDOI
01 Jan 2001
TL;DR: Of JIRCAS/IPGRI Joint International Workshop on Cryopreservation of Tropical Plant Germplasm – Current Research Progress and Genetic Resources and Conservation 175.
Abstract: of JIRCAS/IPGRI Joint International Workshop on Cryopreservation of Tropical Plant Germplasm – Current Research Progress and Genetic Resources and Conservation 175

63 citations

Journal ArticleDOI
TL;DR: Cytochemical tests of polysaccharides confirmed that only the Golgi bodies are involved in mucilage secretion and also suggest that the mucilage passes through the plasmalemma by reverse pinocytosis.
Abstract: The mucilage cells of Opuntia ficus-indica start to differentiate in the apical meristem of the shoot. Six stages of development have been distinguished, based on ER development, Golgi body differentiation, and appearance of mucilage. Cytochemical tests of polysaccharides confirmed that only the Golgi bodies are involved in mucilage secretion and also suggest that the mucilage passes through the plasmalemma by reverse pinocytosis.

63 citations