Wing · 16 specimens
The Glasshouse keeps the living specimens — equally impossible, but on balance on our side. They are watered, recorded and, where possible, thanked.

Calendula hilarans
A marigold that sprouts only at funerals and makes the mourners remember something funny about the dead.

Hedera reparans
A climbing ivy that slowly repairs whatever it grows over — cracked pots, torn paper, once a broken wrist.

Trifolium somniferum
A clover that closes its leaves at the exact moment anyone in the building falls asleep, and opens them for dreams that go well.

Dendrobium epistolare
An orchid whose petals carry faint handwriting — always a letter of thanks, never to anyone the gardener knows.

Lecanora liminis
A grey doorstep lichen from Mansourah that keeps a circle of perfect silence around itself, 2 mm wider every year.

Nymphaea moratoria
A Lapland water lily that, for the nine weeks it is in flower, stops every legal deadline in sight of its pond: tax, leases and evictions.

Sorghum bicolor
A Javanese sorghum whose stalks stop at the exact height of any child who stands beside them, and once stopped for the night watchman.

Ocimum gratissimum
A fokontany-office basil from Toamasina adds one name to every list made beside it: a living person no register has ever recorded.

Sarracenia purpurea
A purple pitcher plant whose tin chapel turned up in a 1790 vestry minute, just in time to beat a council demolition order.

Dioscorea meridiana
In a Leeds curry house, everything near this yam cast the shadow of the sun over Kozhikode, and the cook rang home by the salt cellar.

Lilium caliginosum
On fog nights in the St. John's Narrows, skippers steered home by a widow walking Signal Hill, because every compass near her lily pointed at her.

Washingtonia filifera
A fan palm from a Basque net-loft yard keeps the sky over the Palm House grey for as long as anyone beneath it owes money to anyone else.

Hydrangea macrophylla
Walk the full 31 metres of this Penzance hydrangea hedge and no one can hear you for an hour, as a neighbour did at two in the morning in March 1971.

Sarcocornia quinqueflora
A Tasmanian saltmarsh glasswort gives the crabs and one wombat sheltering in it freehold title, stamped and registered in Hobart.

Peraxilla tetrapetala
From 1967 to 1994 a Te Anau florist could see herself only with someone else in the mirror, so her neighbour came round every morning at 7.40.

Mammillaria griseiflora
A Kutaisi windowsill cactus flowers grey to every human eye and bright to every spectrometer, and one unclaimed exam answer names the colour.