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abot79-6
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Variation among flowers of the Mimulus guttatus complex (Scrophulariaceae). Top row, M. guttatus; middle row, M. platycalyx; bottom row, M. nasutus.
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copyright: Jefferey A. Dole, BSA
license: http://images.botany.org/index.html#license |
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Reproductive Biology
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abot79-6a
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Flowering rosette of the extremely rare Mauna Kea silversword (Argyroxiphium sandwicense subsp. sandwicense growing with a shrubby or tree-like member of the Hawaiian silversword alliance (Dubautia arborea) at about 2,950 m elevation. In spite of great morphological differences (including unbranched monocarpic rosette shrubs, highly branched polycarpic shrubs, trees, and vines), virtually all 28 species in the three genera constituting the silversword alliance retain the ability to hybridize, and many striking hybrid combinations are produced in nature.
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copyright: Gerald D. Carr, BSA
license: http://images.botany.org/index.html#license |
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Reproductive Biology
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abot79-7
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Autoradiograph of a small area of longisection of henbane anther following in situ hybridization with 35s-labeled rice histone antisense probe. Autoradiographic silver grains are localized in epidermis and endodermis (at bottom).
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copyright: -
license: http://images.botany.org/index.html#license |
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Physiology, Biochemistry, and Cell
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abot79-8
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Young peridiate spore of the zygomycotinous fungus, Glomus mosseae, showing branching hyphae that will eventually form a weft.
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copyright: R. Meier, BSA
license: http://images.botany.org/index.html#license |
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Structure and Development
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abot79-9
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Fossil flowers of Florissantia, an extinct genus of sterculiaceous affinity, compressed transversely in shale from the middle Eocene of Republic, Washington.
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copyright: Sandra Sweetman, BSA
license: http://images.botany.org/index.html#license |
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Unclassified
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abot80-1
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Cross section of rachilla of fertile floret of fall Panicum grass. Some vascular parenchyma cells are specialized as transfer cells and exhibit conspicuous wall ingrowths.
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copyright: Thompson Demetrio Pizzolato, BSA
license: http://images.botany.org/index.html#license |
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Structure and Development
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abot80-10
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Transverse section, one locule of vigna vexillata (Fabaceae) anther. The three developing pollen grains are at the microspore stage; each has ektexine ridges overlying a thick inner exine wall (endexine). An additional plug of wall material (Zwischenk
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copyright: Carlos A. P̬rez-Munoz, BSA
license: http://images.botany.org/index.html#license |
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Structure and Development
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abot80-11
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Salt-secreting stem cuttings of Avicennia germinans (left) and Frankenia grandifolia (right) placed in a flask containing 30 mM NaCI under continuous fluorescent light. A. germinans salt deposits are scattered white spots, mainly on the upper (adaxial) leaf surface. Long, hairlike, white salt deposits are obvious on both surfaces of leaves and on the internodes of the stem of F. grandifolia.
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copyright: Ronald A. Balsamo, BSA
license: http://images.botany.org/index.html#license |
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Physiology, Biochemistry, and Cell
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abot80-12
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An aspect of red algal reproduction illustrated by the release of diploid spores from a cystocarp of Gracilaria verrucosa.
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copyright: Sophie Richerd, BSA
license: http://images.botany.org/index.html#license |
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Reproductive Biology
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abot80-2
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Wild rose mallow (Hibiscus moscheutos): flowers at left; close-up view of stigma at right, where excess pollen grains typically deposited by bees germinate and the resulting pollen tubes must compete for ovules.
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copyright: Allison A. Snow, BSA
license: http://images.botany.org/index.html#license |
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Reproductive Biology
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abot80-3
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Left panel: a germinated Chara oospore (zygote) with a rhizoid and protonemal cell. Right panel: Chara rhizoids that were generated from thallus cuttings. In both panels, the rhizoids are oriented relative to the gravity vector which is toward the bottom of the figures.
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copyright: John Z. Kiss, BSA
license: http://images.botany.org/index.html#license |
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Structure and Development
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abot80-4
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Autofluorescent cell walls of the connective bases of three anthers of a thistle, Cirsium horridulum. The stamen filaments extending down from each connective base are not visible because they lack the autofluorescent component in their cell walls.
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copyright: Thomas C. Pesacreta, BSA
license: http://images.botany.org/index.html#license |
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Structure and Development
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abot80-5
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An extensive natural stand of the homoploid hybird species Iris nelsonii (Iridaceae) in a cypress swamp in extreme southern Louisiana.
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copyright: M. L. Arnold, BSA
license: http://images.botany.org/index.html#license |
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Systematics and Evolution
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abot80-6
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Diverse fruits of cultivars of Solanum muricatum (Pepino duice) ranging from northern (rotund forms) through southern (elongate forms) Peruvian gardens.
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copyright: -
license: http://images.botany.org/index.html#license |
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Systematics and Evolution
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abot80-6a
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Liatris pycnostachya and Ratibida pinnata
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copyright: Tom Rosburg, BSA
license: http://images.botany.org/index.html#license |
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Unclassified
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abot80-7
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Group of giant lobelias (Lobelia wollastonii) in front of a larger group of giant senecios (Dendrosenecio adnivalis) at 4,000 m elevation in the Ruwenzori mountains of Uganda.
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copyright: -
license: http://images.botany.org/index.html#license |
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Systematics and Evolution
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abot80-8
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Transverse view of trunk interior of Browningia candelaris, illustrating adaptations wood rays and a broad pith with an extensive system of collateral vascular bundles.
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copyright: James D. Mauseth, BSA
license: http://images.botany.org/index.html#license |
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Structure and Development
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abot80-9
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The purported diploid hybrid species spectabillis (bluish-pink flowers) co-occurring with P. centranthifolius (red flowers), one of its hypothesized progenitor species.
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copyright: Andrea D. Wolfe, BSA
license: http://images.botany.org/index.html#license |
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Systematics and Evolution
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abot81-1
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At left, female (top) and hermaphrodite (bottom) flower of bladder campion (Silene vulgaris); their nectaries differ in production of sugar content. At right, a European skipper (Thymelicus lineola) removes nectar from a female bladder campion flower. Differences in nectar production between the genders of plants may affect pollinator activity and, ultimately, indbreeding.
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copyright: Claudia L. Jolls, BSA
license: http://images.botany.org/index.html#license |
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Reproductive Biology
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abot81-10
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The Bitterroot Valley of western Montana, showing a typical habitat for the rare species, Arabis fecunda: dry and rocky with erodible, sparsely vegetated slopes. This species has a mixed mating system and exhibits inbreeding depression, attributes of reproductive biology that may complicate efforts to preserve its populations.
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copyright: Matthew B. Hamilton, BSA
license: http://images.botany.org/index.html#license |
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Reproductive Biology
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