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Greater Butterfly-orchid

Platanthera chlorantha

A greater butterfly orchid in a meadow

How to Identify:

Annual/Perennial/BiennialPerennial
HeightUp to 60cm high
Flower typeAlong the rather loose flower spike are 10-40 greenish-white flowers with a long, narrow undivided flower lip and long spur to the rear of the flower
LeavesTwo shiny leaves at the base of the plant are 5-15cm long, with further smaller leaves higher up the stem

 

Butterfly orchid differences.

How to Spot Narrow-leaved Water-dropwort

You’re most likely to find Greater Butterfly-orchid on old or recently restored hay meadows, particularly on well drained calcareous soils. You can also find them on pastures, open scrub and woodland.

They look very similar to their close cousins the Lesser Butterfly-orchid but have slightly larger flowers that are green tinged rather than pure white. You can also look for the pollen bearing structures on their petals called pollinia. These sacs of pollen are V shaped on the Greater Butterfly-orchid but parallel shaped on the Lesser Butterfly-orchid.

Where to Find Greater Butterfly-orchid

This is found across Britain particularly in the south. It’s has steadily declined across the UK over the past 100 years. The reasons are varied but in woodlands where they need dappled sunlight, they have suffered from conifer plantation planting and changes to traditional woodland management.

In grasslands, farming changes, such as too much or too little grazing, or early hay cutting before the plant has chance to flower and set seed, have had a particularly negative effect. The use of chemical fertilizers have also disrupted the delicate soil fungal network that orchids rely on for survival.

Plantlife owns and manages two reserves in Wales that are rich in Greater Butterfly-orchid – Caeau Tan y Bwlch on the Llŷn peninsula in the north, and Cae Blaen-dyffryn above Lampeter in mid Wales. The latter also contains Lesser Butterfly-orchid, so giving you a great opportunity to see the subtle differences between these two beautiful orchid species.

Carolyn Thomas MS, is currently working with us as a Species Champion to raise awareness of Greater Butterfly-orchid and its causes of decline. Find out more about Species and Nature Champions here.

Facts About Greater Butterfly-orchid

  • At night, they exude a vanilla like scent to attract pollinating moths particularly owlet moths and hawkmoths.
  • The moths’ long proboscis and eye placement are crucial for successful pollination, as they need to reach the nectar deep within the flower’s spur. Pollen is usually deposited onto their eyes.
  • This eye-attachment method of pollination has been found to be very effective, with a high percentage of flowers setting seed.
  • The vanilla flower scent can be smelt inside the mature brown seedpod.
  • If you stick a small pencil into the flower, the pollen bearing pollinia will likely stick to the pencil, and if you look closely, they will gradually rise up.
  • Greater Butterfly-orchid can establish within 3-4 years on restored hay meadows that have received green hay from another orchid-rich meadow.

Other Species

Greater Butterfly-orchid
A greater butterfly orchid in a meadow

Greater Butterfly-orchid

Narrow-leaved Water-dropwort
A close up of the top of a Narrow-leaved Water-dropwort flower head, the pretty white petals stand out against a background of grasses

Narrow-leaved Water-dropwort

Narrow-leaved Water-dropwort

Oenanthe silaifolia

A close up of the top of a Narrow-leaved Water-dropwort flower head, the pretty white petals stand out against a background of grasses

How to Identify:

Annual/Perennial/BiennialPerennial
HeightUp to 1 metre high
Flower typeHas 4-8 smaller rounded, umbrella shaped flower clusters about 2 cm in diameter. Each tiny flower has 5 unequal petals with the outer ones slightly larger.
LeavesLeaves branched 1 to 4 times
StemsHollow stem with thin walls

 

How to Spot Narrow-leaved Water-dropwort

This is not an easy plant to easily identify because it looks like a lot of other ‘umbellifers’, plants topped by a mass of frothy white flowers such as Cow Parsley, Wild Carrot and Hogweed. But there are a few clues to help you find it.

First, like the other six native species of Water-dropwort in the UK, it is found in wet places. But this species is particularly associated with floodplain meadows where its tall, hollow, grooved, thin stems can reach up higher than most surrounding wildflowers. These are topped by 4-8 roundish masses of white flowers known as umbels, each lacking modified leaves (bracts) beneath the umbel.

Below ground, it has thick spindle shaped tubers.

A close up of the top of a Narrow-leaved Water-dropwort flower head, the pretty white petals stand out against a background of grasses

Where to Find Narrow-leaved Water-dropwort

As floodplain meadows have dramatically disappeared from the British countryside, so has Narrow-leaved Water-dropwort. There are only an estimated 1,100 hectares of water meadows remaining in England and Wales, less than the size of Heathrow Airport, but there are causes for optimism as society is waking up to the sustainable benefits of these special habitats. These irreplaceable meadows are incredible carbon stores and flood defences, as their deep and absorbent soils hold and slow the flow of flood water.

A heartening example is Lugg Meadow, one of the UK’s most important and historic floodplain meadows. The only known stronghold for Narrow-leaved Water-dropwort in Herefordshire, the county Wildlife Trust is currently delivering a Natural England Species Recovery project to secure the plant’s future on the meadow. Also found on stream sides, and Narrow-leaved Water-dropwort known to colonise restored wet grassland on habitat restoration schemes.

Ellie Chowns MP, is currently working with us as a Species Champion to raise awareness of Narrow-leaved Water-dropwort and its causes of decline.

Find out more about Species and Nature Champions here.

Fun Facts About Narrow-leaved Water-dropwort

  • Lugg Meadow has been managed as a water meadow since at lest the time of the building of Hereford Cathedral around a 1000 years ago
  • Its nectar feeds all kinds of insects but the caterpillar of the parsnip moth is the only insect known to feed on the leaves and stem of the Narrow-leaved Water-dropwort in Britain
  • It wasn’t until 1819 that this plant was first described in print. This was done by a German botanist with the rather grand name of Friedrich Augusr Marschall von Bieberstein
  • Narrow-leaved Water-dropwort has its own official champion in Parliament, Dr Ellie Chowns MP for North Herefordshire
  • A “dropwort” is a plant with drop-shaped tubers.

Other Species

Greater Butterfly-orchid
A greater butterfly orchid in a meadow

Greater Butterfly-orchid

Narrow-leaved Water-dropwort
A close up of the top of a Narrow-leaved Water-dropwort flower head, the pretty white petals stand out against a background of grasses

Narrow-leaved Water-dropwort