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  • 1
    Electronic Resource
    Electronic Resource
    The pollination biology ofHibbertia stricta (Dilleniaceae) (1984)
    Springer
    Plant systematics and evolution 147 (1984), S. 267-277 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Magnoliidae ; Dilleniaceae ; Hibbertia stricta ; Lasioglossum (Halictidae) ; Pollination ecology ; melittophily ; pollen flowers ; Solanum Type flowers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The exines of pollen grains ofHibbertia stricta (DC.)R. Br. exF. Muell. (Sect.Pleurandra) wear an oily, yellow pollen coat that stains positively for lipids. The pollen is collected by asocial bees, exclusively. The most common floral foragers are members of the genusLasioglossum (subgenusChilalictus;Halictidae) and they harvest pollen via thoracic vibration. As these bees cling to the inflated anthers their pollen smeared bodies come in contact with either of the two wet, nonpapillate stigmas. The stigmas respond positively to cytochemical tests for the presence of esterase immediately following expansion of the corolla, indicating the effective pollination period. The foraging patterns of the bees are narrowly to broadly polylectic. AsH. stricta flowers are nectarless, it is not surprising that bees bearing mixed pollen loads always carry the pollen of at least one nectariferous, coblooming plant. The pollination biology ofH. stricta is compared with otherHibbertia spp. and with “pollen flowers” in general.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989388
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  • 2
    Electronic Resource
    Electronic Resource
    Floral evolution and phylogeny in the tribeThelymitreae (Orchidaceae: Neottioideae) (1988)
    Springer
    Plant systematics and evolution 159 (1988), S. 19-47 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Orchidaceae ; Neottioideae ; Thelymitreae ; Calochilus ; Epiblema ; Thelymitra ; Pollination ; floral mimicry ; deception ; evolution of orchids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Australian orchid tribeThelymitreae, composed ofCalochilus, Epiblema, andThelymitra, is unique in theOrchidaceae because of the presence of a mitra or staminodal complex. Evidence from floral structure suggests thatEpiblema andThelymitra are sister genera and thatCalochilus is derived from aThelymitra ancestor. A “Gene Pool Vortex” model and a hypothetical phylogeny illustrate that introgressive hybridization, allopatry, and long distance dispersal have played a major role in the evolution of the tribe. Pollination and hybridization in the tribe are discussed with major emphasis on floral mimicry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937424
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  • 3
    Electronic Resource
    Electronic Resource
    Pollination ecology ofOxalis violacea (Oxalidaceae) following a controlled grass fire (1990)
    Springer
    Plant systematics and evolution 171 (1990), S. 147-155 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Oxalidaceae ; Oxalis violacea ; Andrenidae ; Bombyliidae ; Halictidae ; Megachilidae ; Pollination ecology ; heterostyly
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Vernal grass fires may encourage profuse flowering in clonal, colonies ofOxalis violacea. Long-styled colonies appear to be more floriferous than short-styled colonies and set a greater number of capsules. Individual flowers of both morphs live one or two days, change position on their respective pedicels and advertise nectar concealed at the base of the floral throat. AlthoughDiptera, Hymenoptera, andLepidoptera forage for nectar, bees (Andrenidae,Anthophoridae, Halictidae, andMegachilidae) probably make the only effective pollen transfers between the two morphs. Both male and female bees may transport pollen of both morphs and short-tongued bees (e.g.,Augochlorella spp.,Dialictus spp.) may be more common but as effective as pollinators as long-tongued bees (e.g.,Calliopsis andreniformis andHoplitis spp.). The conversion rate of flowers into capsules is only 13–17%. The spreading style in the short-styled morph is interpreted as an adaptation restricting insect-mediated, self-pollination but encouraging bee-stigma contact during nectar foraging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940602
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  • 4
    Electronic Resource
    Electronic Resource
    Self-isolation and insect pollination in the primitive angiosperms: New evaluations of older hypotheses (1987)
    Springer
    Plant systematics and evolution 156 (1987), S. 159-176 
    Details
    ISSN: 1615-6110
    Keywords: Arecales ; Cyclanthales ; Dilleniaceae ; Magnoliidae ; Angiosperm evolution ; bees ; beetles ; dichogamy ; dicliny ; insects ; protandry ; protogyny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A review of the literature, compiled over the past 40 years suggests new directions for theories discussing the evolution of reproductive isolation and entomophily in angiosperms. Data on breeding systems suggests that the protoangiosperms may have developed gametophytic self-incompatibility. Protogyny is probably ancestral to protandry and herkogamy. Although the proto-flowers were bisexual wide variation in the number of sexual organs within proto-flowers probably led to labile sexuality and early trends towards dicliny. Beetle-pollination in extant relicts appears too specialized to represent an ancestral condition. Rather, the proto-flowers may have been generalist entomophiles incorporating some beetles,Plecoptera, thrips, micropterigid moths and proto-dipterans into their fluctuating spectra of opportunistic pollinators. Bee-pollination is probably polyphyletic in origin evolving repeatedly from angiosperms showing these generalist syndromes. There is still no correlation between primitive bees (especiallyColletidae) and the relictual angiosperms. Pollen that is usually retained within the anthers following dehiscence and the presence of staminal filaments and styles characterizes most of the flowers of those relictual angiosperms pollinated by specialized, modernApoidea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936071
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  • 5
    Electronic Resource
    Electronic Resource
    Evolutionary trends in the androecium of theOrchidaceae (1985)
    Springer
    Plant systematics and evolution 149 (1985), S. 119-134 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Orchidaceae ; Androecium morphology ; pollination ; evolutionary trends
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The evolution of the androecium in theOrchidaceae shows three major trends. There is a progressive trend in the degree of fusion of the filament(s) and staminode(s) to the gynoecium. Secondly, there is a reduction in the number of fertile anthers. Finally, there is a progressive change in the position of the base of the anther relative to the apex of the stigma; in the more primitive orchids the apex of the stigma is always higher than the base of the anther (this position is reversed in the higher orchids). All three trends reflect variation in the evolution of pollen dispersal and pollen reception mechanisms in theOrchidaceae. Trends in the evolution of the orchid anther(s) tend to parallel trends in the evolution of their pollinaria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984157
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  • 6
    Electronic Resource
    Electronic Resource
    Floral mimesis inThelymitra nuda (Orchidaceae) (1986)
    Springer
    Plant systematics and evolution 151 (1986), S. 187-202 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Orchidaceae ; Thelymitra nuda ; Liliaceae ; Dichopogon ; Thysanotus ; Halictidae ; Lasioglossum ; Syrphidae. — Mimesis ; pollinaria ; staminodal hood ; thoracic vibration ; trichome cluster. — Flora of Australia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Insect pollination occurred inThelymitra nuda R. Br. on sunny days when the ambient temperature exceeded 20 °C. The flower buds on a raceme opened subsynchronously displaying the brightly-colored, actinomorphic perianth and exposed the contrastingly-colored, scented and ornamented column. InT. nuda the staminodes and the filament of the fertile stamen are fused to one another producing an inflated hood over the anther. This staminodal hood is terminated in two non-ornamental, but brightly-colored, central lobes and two terete lateral lobes bearing approximately 400 white trichomes. Each trichome bears a double chain of 30–40 spherical, rugulose cells. Female bees, in the genusLasioglossum (Halictidae), were observed to land directly on the hood and curled their bodies around the four lobed tip of the staminodal complex. The bees attempted to forage on the lobes as if they were collecting pollen from fertile, poricidal stamens. These bees applied thoracic vibration to the yellowish central lobes and actively scraped the trichome clusters (Pseudopollen) with their forelegs. Bees carried the pollinaria ofT. nuda dorsally on their abdomens. Abdominal contact with the rostellum appeared to occur when the female bee disengaged herself from the staminodal hood. Observations made of bees on co-blooming flowers, and analyses of pollen loads collected by bees suggested that the orchid flower mimics the guild of blue-purple flowers that lack floral nectar but offer pollen in poricidal anthers. The models ofT. nuda are co-bloomingLiliaceae in the generaDichopogon andThysanotus. However, nectarless, buzz-pollinated flowers are also extensively distributed over the orchid’s range. More than 30% of the flowers in theT. nuda population had their pollinaria removed, suggesting a high capacity for cross-pollination in an orchid genus usually considered to be self-pollinated via mechanical autogamy. This study confirmed previous predictions that column modifications represented a trend towards pseudanthery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02430274
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  • 7
    Electronic Resource
    Electronic Resource
    Observations of the floral biology ofPrasophyllum odoratum (Orchidaceae, Spiranthoideae) (1986)
    Springer
    Plant systematics and evolution 153 (1986), S. 65-76 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Orchidaceae ; Prasophyllum odoratum ; Pollination ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Prasophyllum odoratum is a vernal, nectariferous, terrestrial orchid that flowers profusely six to eight months following cyclical fires that disrupt sclerophyll woodlands. The morphology of the column and pollinarium is indicative of taxa placed within the subfam.Spiranthoideae. The orientation of the pollinaria to the stigma appears to prevent mechanical self-pollination. Both cross- and self-pollination appear to be effected by insects that forage within the brightly-colored, scented, non-resupinate flowers. Ants and drosophilid flies remove nectar, but do not appear to transport pollinaria between flowers. The primary pollinators are polytrophic flies in the fam.Syrphidae and opportunistic male bees in the genusLeioproctus (Colletidae). Approximately 52% of the flowers on a raceme set seed. The comparatively short floral tube ofP. odoratum reflects the dependence of this species on short-tongued insects to effect successful dispersal of pollinaria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989418
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  • 8
    Electronic Resource
    Electronic Resource
    Bee-pollination inHibbertia fasciculata (Dilleniaceae) (1986)
    Springer
    Plant systematics and evolution 152 (1986), S. 231-241 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Dilleniaceae ; Hibbertia fasciculata ; Lasioglossum (Halictidae) ; Leioproctus (Colletidae) ; Myrtaceae ; Bees ; beetles ; floral symmetry ; stamens ; stigmas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In direct contrast to mostHibbertia spp., the flowers ofH. fasciculata R. Br. ex D. C. bear only a single whorl of stamens and these stamens are arranged separately (not in typical “bundles”). The short filaments are appressed to the three carpels so that the inflated, porose and introrsive anthers form a centralized cluster obscuring the three ovaries. The three slender styles emerge at right angles from between the filaments. These styles curve upward and the stigmas form the three points of a triangle; each stigma is approximately one millimeter outside the centralized cluster of anthers. The flowers are nectarless and bear a bright yellow corolla. A pungent and unpleasant fragrance appears to be concentrated within the pollenkitt. When native bees attempt to forage for the pollen, within the cluster of anthers, the ventrally deposited loads of pollen, on the bees' abdomens, contact the outer triangle of stigmas. The major pollinators ofH. fasciculata are female bees in the polylectic genera,Lasioglossum (subgenusChilalictus, Halictidae) andLeioproctus (Colletidae). These bees carry an average of more than two pollen taxa when they are caught foraging onH. fasciculata. 78% of the 47 bees, captured onH. fasciculata carried the pollen from at least one sympatric taxon bearing nectariferous flowers (e.g., genera in theMyrtaceae, Compositae, andEpacridaceae). The pollination biology ofH. fasciculata is assessed in relation to the known radiation of bee-pollinated flowers in the genusHibbertia, and within theDilleniaceae s. l.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989430
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  • 9
    Electronic Resource
    Electronic Resource
    Anthecology ofSchrankia nuttallii (Mimosaceae) on the tallgrass prairie (1990)
    Springer
    Plant systematics and evolution 170 (1990), S. 247-255 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Mimosaceae ; Schrankia nuttallii ; Halictidae ; Bee-pollination ; anthecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Schrankia nuttalii flowers through late spring on the tallgrass prairie. Although each stem produces an average of 26 capitate inflorescences only 12% of those inflorescences will open each day to disperse and receive polyads. Each inflorescence may live up to 48 hours but anthers abscise by late afternoon on the first day and the filaments change color and lose their scent. The 78–93 florets comprising each inflorescence open synchronously before dawn or during early morning hours. First day inflorescences ofS. nuttallii are herkogamous and fragrant. They are nectarless. Bombyliid flies and male bees are infrequent floral foragers so the major pollinators include female bees representing five families;Anthophoridae, Apidae, Colletidae, Halictidae, andMegachilidae. All foraging insects ignore second day inflorescences although stigmas are still receptive. Although 97% of all bees collected onS. nuttallii carrySchrankia polyads in their scopae or corbiculae 59% also carry the pollen/pollinaria of one or more coblooming angiosperms. At least 98% of all bees carrying mixed pollen loads incorporate the pollen/pollinaria of one or more nectariferous taxa (e.g.Asclepias spp.,Asteraceae, Convolvulaceae, Delphinium spec., etc.). Species of halictid bees are more likely to carry pure loads ofS. nuttallii polyads (70%) than bees of the four remaining families. Due to the nectarless florets and high degree of polylectic foraging bee-pollination inS. nuttallii converges more closely with the pollination systems of some AustralianAcacia spp. than with most other xeric/tropical genera of mimosoids studied in the western hemisphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937708
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  • 10
    Electronic Resource
    Electronic Resource
    Notes on the pollination mechanisms ofMoraea inclinata andM. brevistyla (Iridaceae) (1989)
    Springer
    Plant systematics and evolution 163 (1989), S. 201-209 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Iridaceae ; Moraea inclinata ; M. brevistyla ; Bees ; Anthophoridae ; Halictidae ; Pollination mechanism ; flower morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Individual flowers ofMoraea inclinata are nectariferous and last about six hours. They appear to be pollinated largely by bees in the familyHalictidae (Lasioglossum spp.,Nomia spp.,Zonalictus) and to a lesser extent by bees in the familyAnthophoridae (Amegilla). The mechanism of bee-pollination inM. inclinata is the “Iris type”; i.e., each flower consists of three pollination units (an outer tepal, a partly exserted anther, and the opposed style branch which terminates in a pair of petal-like crests). Bees rarely visit more than one pollination unit per flower. Transferral of pollen to the bee is passive and nototribic although all bees collected on the flowers were female and 55% of the bees carried pollen loads with 2–5 pollen taxa in their scopae.Moraea brevistyla flowers are nectariferous but lack scent and last two days. They are visited infrequently by bees and only one femaleLasioglossum spec. carried the pollen ofM. brevistyla. Unlike flowers ofM. inclinata those ofM. brevistyla deposit pollen only on the head and thorax. Bee-mediated autogamy in both species is avoided due to the erratic foraging patterns of the bees and the flexibility of each stigma lobe as the bee backs out of the flower. Approximately 2–4 flowers in the inflorescences of both species (6–8 flowers/infloresence) develop into capsules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936515
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