Jack Dykinga / Foothills of the Temblor Range, carpeted with Coreopsis (yellow) and Purple Owl's Clover (Castilleja exserta) flowers. Carrizo Plain, California, USA. 30th March 2019.

Floris van Breugel / Paintbrush (Castilleja parviflora) flowering in withered sage bush, White Mountains, California, USA, July

Alex Hyde / Fragrant Orchid (Gymnadenia conopsea) and Yellow Rattle (Rhinanthus sp.) flowering in ancient alpine hay meadow. Nordtirol, Austrian Alps. June.

Nick Upton / Traditional organic hay meadow with a profusion of wild flowers and grasses including Pyramid orchid (Anacamptis pyramidalis) Common spotted orchid (Dactylorhiza fuchsii, Rough hawkbit (Leontodon hisp...

Wild Wonders of Europe / Benvie / Broomrape (Cistanche phelypaea) in flower, killing its host Glasswort (Salicornia sp) Huelva, Andalucia, Spain, April 2009

Mike Read / Indian paintbrush (Castilleja linariaefolia) flowering on roadside bank near Signal Mountain, Grand Teton National Park, Wyoming, USA, June.

Mike Read / Bracted lousewort (Pedicularis bracteosa) on a roadside bank near Signal Mountain, Grand Teton National Park, Wyoming, USA, June.

Steve Nicholls / Seed head of Yellow-rattle (Rhinanthus minor), limestone grassland on Rodborough Common, Gloucestershire, UK. September 2011

Erlend Haarberg / Alpine bartsia (Bartsia alpina), Jotunheimen National Park, Norway, July.

Nigel Cattlin / Knapweed broomrape (Orobanche elatior) flower spike in grassland. Disused chalk pit nature reserve, Berkshire, England, UK. June

Nick Garbutt / Alpine Wildflower meadow, a diversity of species including Meadow clary (Salvia pratensis), Sainfoin (Onobrychis sp) and Rattle (Rhinanthus sp). North Tyrol, Austria. June.

Nigel Cattlin / Knapweed broomrape (Orobanche elatior) flowers, parasite of Knapweed (Centaurea). Kent, England, UK.

Heather Angel / Bumblebee scarab beetles (Pygopleurus humeralis) feeding on Phelypaea flower (Phelypaea coccinea). Flower has marks that mimic beetle elytra wings to attract pollinators. Plant parasitic on Tanacetum...

Heather Angel / Texas bluebonnets (Lupinus texensis) and Indian paintbrush (Castilleja coccinea) amongst wildflowers in ditch beside byway. Rains triggered germinaton of annual seeds. Cuero, Texas, USA. April.

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 / Lousewort (Pedicularis oxycarpa), a hemi-parasite on grass. Pollinated by bumblebees through buzz pollination, rapid vibration of flight muscles releases pollen in the flower. Near Barkham, Sichuan Pr...

Adrian Davies / Knapweed broomrape (Orobanche elatior), parasite on roots of Greater knapweed (Centaurea scabiosa). Hampshire, England, UK. June.

Phil Savoie / Indian paintbrush (Castilleja angustifolia) flower, Beaverhead National Forest, Montana, USA. July.

Ross Hoddinott / Green-veined white butterfly (Pieris napi) resting on yellow rattle (Rhinanthus minor) flower, Volehouse Moor Nature Reserve, Devon, England, UK. July.

Nick Upton / Alpine eyebright (Euphrasia alpina) flowering on montane pastureland among limestone rocks, Covadonga, Picos de Europa, Asturias, Spain, August.

Colin Varndell / Red bartsia (Odontites verna) in flower. Hod Hill, Dorset, UK, July.

Adrian Davies / Toothwort (Lathraea squamaria), parasitic on hazel (Corylus avellana) tree roots, ancient woodland indicator species. Surrey, England, UK. April.

Adrian Davies / Toothwort (Lathraea squamaria), parasitic on hazel (Corylus avellana) tree roots, ancient woodland indicator species. Surrey, England, UK. April, 2018.

Adrian Davies / Toothwort (Lathraea squamaria), parasitic on hazel (Corylus avellana) tree roots, ancient woodland indicator species. Surrey, England, UK. April.

Mike Read / Wildflowers growing in puszta grassland with Yellow rattle (Rhinanthus minor) near Tiszaalpar, Kiskunsag National Park, Hungary, June 2017

Mike Read / Wildflowers growing in puszta grassland with Yellow rattle (Rhinanthus minor) near Tiszaalpar, Kiskunsag National Park, Hungary, June 2017

Stephen Dalton / Brimstone butterfly (Gonepteryx rhamni) on Yellow rattle flower (Rhinanthus minor) Somerset, England, UK, May.

Rod Williams / Yellow rattle flowers (Rhinanthus minor) and Wild Marjoram (Origanum vulgare) Hutchinson's Bank, New Addington, London, England, UK. August.

Fabrice Cahez / Field cow-wheat (Melampyrum arvense) in flower, Vosges, France, May.

Fabrice Cahez / Field cow-wheat (Melampyrum arvense) in flower, Vosges, France, May.

Felis Images / Tube lousewort (Pedicularis siphonantha) flowers by a waterfall, Sikkim, India.

Felis Images / Royle's lousewort (Pedicularis roylei) flowers, Sikkim, India.

Felis Images / Royle's lousewort (Pedicularis roylei) flowers, Sikkim, India.

Felis Images / Royle's lousewort (Pedicularis roylei) flowers, Sikkim, India.

Felis Images / Royle's lousewort (Pedicularis roylei) flowers, Sikkim, India.

Jouan Rius / Indian paintbrush in flower (Castilleja coccinea), Capitol Reef National Park, Utah, USA, April.

Jussi Murtosaari / Lapland lousewort (Pedicularis lapponica) in flower, Finland, July.

Sue Daly / Ivy broomrape (Orobanche hederae), Alderney, British Channel Islands, May.

Sue Daly / Eyebright (Euphrasia sp) Jersey, British Channel Islands, August.

Sue Daly / Lousewort (Pedicularis sylvatica) Sark, British Channel Islands, April.

Sue Daly / Lousewort (Pedicularis sylvatica) in graveyard, Sark, British Channel Islands, April.

Sue Daly / Lousewort (Pedicularis sylvatica) Sark, British Channel Islands, April.

Stephen Dalton / Larger skipper (Ochlodes sylvanus) feeding on Yellow rattle (Rhinanthus minor) Rookery Wood, Sussex, England, UK. June.

Stephen Dalton / Yellow rattle in flower (Rhinanthus minor) Sussex, England, UK, July.

Juan Carlos Munoz / Purple toothwort (Lathraea clandestina) Liendo, Cantabria, Spain, April 2016.

Juan Carlos Munoz / Purple toothwort (Lathraea clandestina) Liendo, Cantabria, Spain, April 2016.

Fabrice Cahez / Meadow with flowers of Meadow clary (Salvia pratensis), Yellow rattle (Rhinanthus minor), Sainfoin (Onobrychis viciifolia) and Ox-eye daisy (Leucanthemum vulgare), Vosges, France. May.

Fabrice Cahez / Meadow with flowers of Meadow clary (Salvia pratensis), Yellow rattle (Rhinanthus minor), Sainfoin (Onobrychis viciifolia) and Ox-eye daisy (Leucanthemum vulgare), Vosges, France. May.