Albert Lleal / Albany Bottlebrush (Callistemon speciosus) SEM close-up view of the pollen covered anther at 70x magnification

WILLIAM OSBORN / Rainbow lorikeet in bottlebrush tree, Queensland, Australia {Trichoglossus haematodus}

Dave Watts / Two Little pygmy possum {Cercarteus lepidus} Australia

Steven David Miller / Rainbow lorikeet (Trichoglossus moluccanus) feeding on Bottlebrush nectar. Lane Cove National Park, Sydney, New South Wales, Australia.

Steven David Miller / Rainbow lorikeet (Trichoglossus moluccanus) feeding on Bottlebrush nectar. Lane Cove National Park, Sydney, New South Wales, Australia.

Heather Angel / Red wattlebird (Anthochaera carunculata) nectaring on Bottlebrush (Callistemon sp). Bird has brush-tipped tongue. Quaalup Homestead near Fitzgerald River National Park, Western Australia.

Ingo Arndt / Squirretail grass (Elymus elymoides), Badlands National Park, South Dakota, USA September.

Ingo Arndt / Paperbark trees or White Bottlebrush (Melaleuca quinquenervia) in the wet season after bushfire with charred bark, Kakadu National Park, Australia, December

Rolf Nussbaumer / Baltimore Oriole (Icterus galbula), adult male feeding on Lemon / Crimson bottlebrush flower (Melaleuca citrina), South Padre Island, Texas, USA. April

Rolf Nussbaumer / Tennessee Warbler (Vermivora peregrina), adult feeding on blooming Lemon bottlebrush, crimson bottlebrush (Melaleuca citrina), South Padre Island, Texas, USA. April

Rolf Nussbaumer / Orchard Oriole (Icterus spurius), male feeding on blooming Lemon bottlebrush, crimson bottlebrush (Melaleuca citrina), South Padre Island, Texas, USA. April

Nick Upton / Crimson / Lemon bottlebrush flower (Malaleuca / Callistemon citrinus), an introduced species from Australia, Kilada, Argolis, Peloponnese, Greece, July 2013.

Juan Manuel Borrero / Weeping bottlebrush tree (Callistemon viminalis) cultivated plant occurs in Australia.

MYN / Gil Wizen / Bearded weevil (Rhinostomus barbirostris), Caves Branch, Cayo District, Belize, September. meetyourneighbours.net project

MYN / Lily Kumpe / Swamp Bottlebrush (Beaufortia sparsa) Denmark Shire, Warren Bioregion, Western Australia. Meetyourneighbtous.net project

MYN / Andrew Snyder / Bottlebrush Weevil (Rhinostomus barbirostris), Berbice River, Guyana, September. Meetyourneighbours.net project.

MYN / Andrew Snyder / Bottlebrush Weevil (Rhinostomus barbirostris), Berbice River, Guyana, September. Meetyourneighbours.net project.

MYN / Andrew Snyder / Bottlebrush Weevil (Rhinostomus barbirostris), Berbice River, Guyana, September. Meetyourneighbours.net project.

Markus Varesvuo / Blackcap (Sylvia atricapilla) male perched in Bottlebrush tree, Israel, May

MYN / JP Lawrence / Bearded Weevil (Rhinostomus barbirostris) Gamboa, Panama. Meetyourneighbours.net project

MYN / JP Lawrence / Bearded Weevil (Rhinostomus barbirostris) Gamboa, Panama. Meetyourneighbours.net project

Roland Seitre / Bottlebrush (Melaleuca quinquenervia) trees in dry forest, Poindimie, North Province, New Caledonia

Roland Seitre / Bottlebrush tree (Melaleuca quinquenervia) forest, Poindimie, North Province, New Caledonia

Roland Seitre / Bottlebrush Hakea (Hakea francisiana) Banksia Farm, Mount Barker, South-West Land Division, Western Australia.

Roland Seitre / Bottlebrush Hakea (Hakea francisiana) Banksia Farm, Mount Barker, South-West Land Division, Western Australia.

Marie Read / Macleay's Honeyeater (Xanthotis macleayana) perching amid bottlebrush (Callistemon sp.) flowers. Atherton Tableland, Queensland, Australia, October.

Marie Read / New Holland / Yellow Winged Honeyeater (Phylidonyris novaehollandiae) attracted to feed on bottlebrush (Callistemon sp.) flower, Kangaroo Island, Australia, December.

Marie Read / Macleay's Honeyeater (Xanthotis macleayana) perching amid bottlebrush (Callistemon sp.) flowers. Atherton Tableland, Queensland, Australia, October.

Jeff Vanuga / Bottlebrush Squirreltail (Elymus elymoides)close up in fall. Denali National Park, Alaska, USA.

Nick Upton / Silver Oak / Silky Oak tree (Grevillea robusta) with orange bottlebrush flowers. Introduced from Australia. Campomoro, Corsica, France, June.

Ingo Arndt / Paperbark (Melaleuca quinquenervia) forest in the wet season after bushfire, Kakadu National Park, Australia

Jouan & Rius / Close up of Bracelet Honey Myrtle tree flower (Melaleuca armillaris) Lesueur National Park, Western Australia

Rolf Nussbaumer / Baltimore / Northern Oriole (Icterus gabula) male feeding on Lemon Bottlebrush (Callistemon citrinus) Sinton, Corpus Christi, Coastal Bend, Texas Coast, USA

Rolf Nussbaumer / Baltimore / Northern Oriole (Icterus gabula) feeding on Lemon Bottlebrush (Callistemon citrinus) Sinton, Corpus Christi, Coastal Bend, Texas Coast, USA

Vincent Grafhorst / Natal Bottlebrush (Greyia sp) flowering, Royal Natal National Park, South Africa

Wild Wonders of Europe / Radisics / Weeping bottlebrush (Callistemon viminalis) flower, Madeira, March 2009

Albert Lleal / Bottlebrush (Callistemon sp) SEM close-up view of a grain of pollen at 2800x magnification

Doug Perrine / Bottlebrush black coral {Parantipathes tetrasticha} viewed from submersible growing at about 900 ft depth. Grand Cayman Is, Caribbean

Dave Watts / Little pygmy possum feeding in Bottlebrush tree {Cercarteus lepidus} Tasmania

Michael & Patricia Fogden / Roth's Tree Frog (Litoria rothii) on Paperbark Tree (Melaleuca quinquenervia), Kakadu National Park, Northern Territory, Australia

WILLIAM OSBORN / Weeping bottlebrush flowers on tree {Callistemon viminalis} Queensland, Australia

Yva Momatiuk & John Eastcott / Paperbark (Melaleuca quinquenervia) growing in shallow pond, Washpool National Park, New South Wales, Australia

Roland Seitre / Rainbow lorikeet (Trichoglossus moluccanus) feeding on Common red bottlebrush (Melaleuca citrina) nectar, Australia.

Roland Seitre / Rainbow lorikeet (Trichoglossus moluccanus) feeding on Common red bottlebrush (Melaleuca citrina) nectar, Australia.

Roland Seitre / Rainbow lorikeet (Trichoglossus moluccanus) feeding on Common red bottlebrush (Melaleuca citrina) flowers, Queensland, Australia.

Roland Seitre / Scaly-breasted lorikeet (Trichoglossus chlorolepidotus) feeding on Common red bottlebrush (Melaleuca citrina) flower, Queensland, Australia.

Roland Seitre / Scaly-breasted lorikeet (Trichoglossus chlorolepidotus) feeding on Common red bottlebrush (Melaleuca citrina) flower, Queensland, Australia.

Jiri Lochman / Southern bush rat (Rattus fuscipes assimilis) feeding on the flower nectar of Crimson bottlebrush (Callistemon citrinus), Greater Blue Mountains UNESCO Natural World Heritage Site, New South Wales, Au...

Jiri Lochman / Southern bush rat (Rattus fuscipes assimilis) feeding on the flower nectar of Crimson bottlebrush (Callistemon citrinus), Greater Blue Mountains UNESCO Natural World Heritage Site, New South Wales, Au...

Jiri Lochman / Southern bush rat (Rattus fuscipes assimilis) feeding on the flower nectar of Crimson bottlebrush (Callistemon citrinus), Greater Blue Mountains UNESCO Natural World Heritage Site, New South Wales, Au...

Jiri Lochman / Western spinebill (Acanthorhynchus superciliosus) male, feeding on One-sided bottlebrush (Calothamnus sanguineus) flowers, John Forrest National Park, Darling Range, Western Australia.

Bruce Thomson / Little wattlebird (Anthochaera chrysoptera) perched in flowering Bottlebrush (Callistemon / Melaleuca sp.) Jervis Bay, Australian Capital Territory, Australia.

Bruce Thomson / Scarlet honeyeater (Myzomela sanguinolenta) male in Bottlebrush shrub (Callistemon / Melaleuca sp.) Brisbane, Queensland, Australia.

Bruce Thomson / Scarlet honeyeater (Myzomela sanguinolenta) male in Bottlebrush shrub (Callistemon / Melaleuca sp.) Brisbane, Queensland, Australia.

Jiri Lochman / Honey possum (Tarsipes rostratus), feeding on Honey possum favourites, the nectar of One-sided Bottlebrush (Calothamnus quadrifidus), at night, Peak Charles National Park, Australia.

Jiri Lochman / Honey possum (Tarsipes rostratus), feeding on Honey possum favourites, the nectar of One-sided Bottlebrush (Calothamnus quadrifidus), at night, Peak Charles National Park, Australia.

Jiri Lochman / Honey possum (Tarsipes rostratus), feeding on Honey possum favourites, the nectar of One-sided Bottlebrush (Calothamnus quadrifidus), at night, Peak Charles National Park, Australia.

Jiri Lochman / Eastern Pygmy-possum (Cercartetus nanus) feeding on the Lemon Bottlebrush (Callistemon citrinus), Greater Blue Mountains UNESCO Natural World Heritage Site, New South Wales, Australia.

Jiri Lochman / Eastern Pygmy-possum (Cercartetus nanus) feeding on the Lemon Bottlebrush (Callistemon citrinus), Greater Blue Mountains UNESCO Natural World Heritage Site, New South Wales, Australia.

Jiri Lochman / Eastern Pygmy-possum (Cercartetus nanus) feeding on nectar of the Lemon Bottlebrush (Callistemon citrinus), Greater Blue Mountains UNESCO Natural World Heritage Site, New South Wales, Australia.

Dave Watts / Prickly bottlebrush (Callistemon viridiflorus). Tasmania, Australia. November.

Rolf Nussbaumer / Orchard oriole (Icterus spurius) male feeding on Lemon bottlebrush (Callistemon pallidus) flowers. South Padre Island, Texas, USA.

Marie Lochman / Bottlebrush grevillea (Grevillea paradoxa) northern wheatbelt, Western Australia. Western Australian endemic

Marie Lochman / Bottlebrush grevillea (Grevillea paradoxa) northern wheatbelt, Western Australia. Western Australian endemic

Marie Lochman / Bottlebrush grevillea (Grevillea paradoxa) northern wheatbelt, Western Australia. Western Australian endemic

Philippe Clement / Bottlebrush in flower, Callistemon species endemic to Australia. May