These are my 25 plants, with scientific names and a brief explanation about each species:
1. Weeping paperbark Melaleuca leucadendra - A 20m swamp-forest tree from northern Australia, New Guinea and Southeast Asia to India
2. Teak Tectona grandis - A dry forest and savannah tree of up to 30m, found through South and Southeast Asia
3. Tree rhododendron Rhododendron arboreum - A large flowering tree that averages around 12m high, native to the Himalayas
4. Pampas grass Cortaderia selloana - A distinctive South American grassland plant
5. Screw pine Pandanus - Palm-like shrubs and trees native to the Old World tropics, although they are best-known from the South Pacific islands
6. Antarctic hair grass Deschampsia antarctic - A tussock-forming grass that is common in penguin colonies and is one of just two Antarctic flowering plants
7. River red gum Eucalyptus camaldulensis - An important food tree for the koala, which typically grows to 20m
8. Nara melon Acanthosicyos horridus - A low, wide-spreading, thorny bush from the Namib desert that produces fruits eaten by elephant, ostrich and gemsbok
9. Oriental persimmon Diospyros kaki - A 10m tall temperate tree from Central, Eastern and northern Southeast Asia that produces edible orange fruit
10. Sea buckthorn Hippophae rhamnoides - A small thorny shrub that grows in poor soils like coasts and alpine areas across Europe and Asia
11. Traveller's tree Ravenala madagascariensis - A strange palm-like Madagascan tree closely associated with ruffed lemurs, which are its pollinators
12. Longleaf pine Pinus palustris - A 30m tall conifer native to the grasslands of the southeastern USA
13. Water cabbage Pistia stratiotes - A floating aquatic plant native to Africa but now naturalised through all tropical freshwater habitats
14. Nyala tree Xanthocercis zambesiaca - A floodplain tree of southern Africa named because its fruit are favoured by nyala as food
15. Jackalberry tree Diospyros mespiliformis - Another African savanna tree that averages 4-6m in height, although it can grow to 20m
16. Whistling thorn Vachellia drepanolobium - Another African savanna tree most famous for producing rounded galls that provide homes for ants
17. Bull kelp Nereocystis luetkeana - Not a plant, but a marine algae of the Pacific coast that forms part of the habitat for sea lions
18. Mopane tree Colophospermum mopane - An African tree that forms dense woodland, often home to elephant, giraffe and sable antelope
19. Raffia palm Raphia - A rainforest tree mostly associated with the tropical rainforests of mainland Africa and Madagascar
20. Limbali tree Gilbertiodendron dewevrei - Often the dominant tree in the tropical rainforests of Central and Western Africa
21. Cedar of Lebanon Cedrus libani - A huge tree that can reach 40m in height, native to the eastern Mediterranean and a common ornamental tree
22. Wild daffodil Narcissus pseudonarcissus - A more muted wild relative of the ornamental daffodil, suitable for European exhibits
23. Bluebell Hyacinthoides non-scripta - Speaking personally, a badger enclosure does not feel complete without these west European flowers
24. Joshua tree Yucca brevifolia - A North American desert tree that probably evolved to have its fruit dispersed by mammoths and ground sloths
25. Venus flytrap Dionaea muscipula - Might be too small, but it is one of the most charismatic plants - bonus points if one of the traps occasionally closes