Orsolya Haarberg / Calyx tube of the Northern catchfly (Silene uralensis apetala) Abisko National Park, Sweden, July

Wild Wonders of Europe / Lilja / Long beaked storksbill (Erodium gruinum) flower, Akamas Peninsula, Cyprus, May 2009

Nigel Cattlin / Dandelion (Taraxacum officinale), cross section of composite flower with disk and ray florets, on black background.

Nigel Cattlin / Fly orchid (Ophrys insectifera) flower. Hampshire, England, UK.

Heather Angel / Common drone fly (Eristalis tenax) nectaring on Winter aconite (Eranthis hyemalis). Surrey, England, UK.. February.

Heather Angel / Peach leaved bellflower (Campanula persicifolia) dissection, petals removed to show how stamens transfer pollen to style via secondary pollen presentation in bud stage. Focus stacked.

Heather Angel / Scarlet monkey flower (Mimulus cardinalis). The high position of the stamens and stigma ensure that the heads of hummingbird pollinators make contact with them whilst nectaring. Cultivated in garden,...

Heather Angel / Winter aconite (Eranthis hyemalis) flower and bud. Ring of nectaries formed from petals. In garden, Surrey, England, UK. February.

Heather Angel / Winter aconite (Eranthis hyemalis) with ring of nectaries below stamens. Focus stacked.

Heather Angel / Winter aconite (Eranthis hymenalis) in UV light, pollen on outer stamens that have dehisced fluorescing. Focus stacked.

Edwin Giesbers / Pasture goatsbeard (Geropogon hybridus) flower, close up. Cyprus. April.

Edwin Giesbers / Pasture goatsbeard (Geropogon hybridus) flower. Cyprus. April.