Oenothera

small erect annual among mixed alluvial gravels of pale limestone and reddish volcanic rhyolite on low hill crest north of road.

small erect annual among mixed alluvial gravels of pale limestone and reddish volcanic rhyolite on low hill crest north of road.

small erect annual among mixed alluvial gravels of pale limestone and reddish volcanic rhyolite on low hill crest north of road.

on ledge of white blocky limestone on north face of small cliff bordering large arroyo in Heath Canyon. With Selaginella lepidophylla.

on ledge of white blocky limestone on north face of small cliff bordering large arroyo in Heath Canyon.

Category hierarchy: Plants | Desert plantsDescription: Desert evening primrose in Arches National Park.Capture device: Camera: Nikon CoolPix 885Original date: 20040600Locality: Latitude: 3.932100000000000e+001; Longitude: -1.110940000000000e+002

Under a high magnification of 1648x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure displayed by a number of pollen grains found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. These pollen grains were of the "tricolpate" type of pollen, which means that their outer surface was traversed from pole to pole, by three symmetrically placed furrows. The textured surface also identified these grains as the "reticulate" type. Note the round shape of these grains, indicating that they had yet to undergo a drying process, in order to become ready to be disseminated into the plants environment.Created: 2006

Under a very high magnification of 3297x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure displayed by a pollen grain found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. This pollen grain was of the "tricolpate" type of pollen, which means that the outer surface was traversed from pole to pole, by three symmetrically placed furrows. The textured surface also identified this grain as a "reticulate" type. Note that the grain's shape was elliptical, indicating that it had undergone a drying process, and was ready to be disseminated into the plants environment.Created: 2006

Under a high magnification of 1648x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. These pollen grains were of the "tricolpate" type of pollen, which means that the outer surface is traversed from pole to pole, by three symmetrically placed furrows. The textured surface also identified this grain as of the "reticulate" type. Note that the grains' shape is elliptical, indicating that they had undergone a drying process, and were ready to be disseminated into the plants environment.Created: 2006

Under a magnification of 206x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. Note the pod-like configuration of the anther, within which reside many pollen grains ready for dissemination into the passing wind, or to become attached to a pollinator such as a bee. Judging by the shape of these pollen grains, it appears that the majority had yet to dry, for the elliptical, "football"-shaped grain, closer to the lip of the anther, represented those that had dried, and the round grains represented those that were still moist.Created: 2006

Under a low magnification of 103x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. Note the pod-like configuration of the anther, within which reside many pollen grains ready for dissemination into the passing wind, or to become attached to a pollinator such as a bee. Judging by the shape of these pollen grains, it appears that the majority had yet to dry, for the elliptical, "football"-shaped grain, closer to the lip of the anther, represented those that had dried, and the round grains represented those that were still moist.Created: 2006

Under a very low magnification of 50x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. Note the pod-like configuration of the anther, within which reside many pollen grains ready for dissemination into the passing wind, or to become attached to a pollinator such as a bee. Judging by the shape of these pollen grains, it appears that the majority had yet to dry, for the elliptical, "football"-shaped grain, closer to the lip of the anther, represented those that had dried, and the round grains represented those that were still moist.Created: 2006

Under a low magnification of 98x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. Note the pod-like configuration of the anther, within which reside many pollen grains ready for dissemination into the passing wind, or to become attached to a pollinator such as a bee. Judging by the shape of these pollen grains, it appears that the majority had yet to dry, for the elliptical, "football"-shaped grains, closer to the lip of the anther, represented those that had dried, while the round grains represented those that were still moist.Created: 2006

Magnified 101x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. Note the pod-like configuration of the anther, within which reside many pollen grains ready for dissemination into the passing wind, or to become attached to a pollinator such as a bee.Created: 2006

Magnified 201x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. The circular shape of these grains means that they still need to further dry before they are ready to be dispersed. The drying will also change their morphology, whereupon, the grains will become elliptical, or "football"-shaped. These pollen grains were of the "tricolpate" type, which means that the outer surface is traversed from pole to pole, by three symmetrically placed furrows.Created: 2006

Under a high magnification of 3375x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. The circular shape of these grains means that they still need to further dry before they are ready to be dispersed. The drying will also change their morphology, whereupon, the grains will become elliptical, or "football"-shaped. These pollen grains were of the "tricolpate" type, which means that the outer surface is traversed from pole to pole, by three symmetrically placed furrows.Created: 2006

Under a moderately high magnification of 1687x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. The circular shape of these grains means that they still need to further dry before they are ready to be dispersed. The drying will also change their morphology, whereupon, the grains will become elliptical, or "football"-shaped.Created: 2006

Under a moderately high magnification of 844x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. Note the granules embedded in a sandy-like substance. This finely granulated substance represents the contents of the disintegrated tapetum cells, which during the pollens' development, surrounds the maturing pollen grains, and has been termed "pollenkitt".Created: 2006

At a low magnification of 99x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. Amongst this grouping were pollen grains representing various stages of drying through which these pollen grains pass as they mature. The drying of the grains changes their shape making them more elliptical-shaped, and less circular.Created: 2006

Magnified 192x, this scanning electron micrograph (SEM) revealed some of the morphologic ultrastructure found amongst a collection of pollen found within the dehisced, or split open, anther of a yellow "Fireworks" sundrops, Oenothera fruticosa flower. Amongst this grouping were pollen grains representing various stages of drying through which these pollen grains pass as they mature. The drying of the grains changes their shape making them more elliptical-shaped, and less circular.Created: 2006

Hábito y Flores de Oenothera epilobiifolia. Foto: Milady Alfaro.

The upper photograph was taken at a flower garden near a sidewalk in Urbana, Illinois, while the lower photograph was taken at M