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Photo#294059
Allograpta series from north of Death Valley - Allograpta obliqua - female

Allograpta series from north of Death Valley - Allograpta obliqua - Female
Mouth of Cottonwood Canyon, at southeast base of the White Mountains, Inyo County, California, USA
June 16, 2009
Here the syrphid is perched atop a "riper" (older) flower, where the keel has opened up and the orange anthers are exposed to view (beneath the syrphid's thorax).

Although not visible here, the stigma is atop an upturned style just forward of the anthers, by the syrphids face.

On many (but not all!) plants, the stigma of an individual flower becomes receptive after the anthers finish shedding their pollen (so-called "protandrous flowers"). Morevoer, often such flowers mature in a temporal sequence from the lower part of the inflorescence (= flowering stem) towards the upper part. In this situation, if a pollinator moves through the inflorescences from bottom to top, as is often the case, it will have fresh pollen from a newly opened flower when it leaves the top of one inflorescence, and deliver it to a receptive stigma on an older flower at the bottom of the subsequent inflorescence. In this system, when the pollinator moves to an inflorescence on the next bush, the likelihood of cross-fertilization is greatly increased.

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Allograpta series from north of Death Valley - Allograpta obliqua - female Allograpta series from north of Death Valley - Allograpta obliqua - female Allograpta series from north of Death Valley - Allograpta obliqua - female Allograpta series from north of Death Valley - Allograpta obliqua - female Allograpta series from north of Death Valley - Allograpta obliqua - female Allograpta series from north of Death Valley - Allograpta obliqua - female Allograpta series from north of Death Valley - Allograpta obliqua - female

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