Heather Angel / Broomrape (Pedicularis longiflora) in wet meadow amongst Horsetail (Equisetum sp). Maroon marks on flowers act as Nectar guides. Road from Barkham to Ruo Er Gai, Sichuan Province, China. July.

Heather Angel / Seep monkey flower (Mimulus guttatus), bifid stigma above stamens. Nectar spot guides and central groove leading pollinators to nectar. Focus stacked.

Heather Angel / Prophet flowers (Arnebia pulchra) with dark spots that act as nectar guides. Caucasus, Russia. June.

Heather Angel / Balsam (Impatiens rosulata) with yellow nectar guides. Endemic to Kitulo Plateau, Tanzania.

Heather Angel / Chilean monkey flower (Mimulus naiandinus). The lower lip has a groove to guide the pollinator's proboscis to the nectar source, with red spots acting as nectar guides. Cultivated in garden, Surre...

Heather Angel / Spiderplant (Cleome hirta) flowerhead.Patterns on two banner petals serve as nectar guides. Tanzania.

Heather Angel / Gold band lily (Lilium auratum) flower. Yellow nectar guides lead pollinators to nectaries. Pollinators are swallowtail butterflies and hawkmoths. Cultivated in garden, Surrey, England, UK. Native to...

Heather Angel / Ivy leaved toadflax (Cymbalaria muralis) flowers with orange nectar guides. Surrey, England, UK. April.

Heather Angel / Gold band lily (Lilium auratum) with yellow nectar guides. In cultivation. Native to Japan.

Heather Angel / Lisbon false sun-rose / Yellow rock rose (Halimium lasianthum) flowers. Blotch at base of petals guides pollinators to nectar source.

Heather Angel / Afghanistan Juno iris (Iris cycloglossa) with yellow nectar guides. In cultivation, Kew Gardens, London, England, UK. Native to Afghanistan.

Heather Angel / Common toadflax (Linaria vulgaris), orange nectar guides on lower lip and long spur containing nectar. Surrey, England, UK. Focus stacked.

Heather Angel / Foxglove (Digitalis purpurea) corollas with spatter mark nectar guides. Pollinated by long tongued bumblebees able to reach nectar. Long guard hairs said to prevent small insects from entering, could...

Heather Angel / Foxglove (Digitalis purpurea), blue nectar guides and anthers, pollen and stigma fluorescing in UV light. Focus stacked.

Heather Angel / Southern catalpa (Catalpa bignonioides) flowers. Recently opened with yellow nectar guides, purple in older pollinated flowers. Surrey, England, UK. Native to USA.

Heather Angel / Yellow mariposa lily (Calochortus luteus) with dark nectar guides. Cultivated in glasshouse, Surrey, England, UK. Endemic to California.