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It is commonly believed that the word “butterfly” is a derived from “butter-coloured fly” which is attributed to the yellow of the male Brimstone butterfly, the female being a much paler whitish-green. The Brimstone has a most exquisite wing shape, perfectly matching a leaf when roosting overnight or hibernating within foliage. This is one of the few species that hibernates as an adult and, as such, spends the majority of its life as an adult butterfly. Subspecies: rhamni This subspecies represents the population in the British Isles, with the exception of Ireland. Subspecies: gravesi This subspecies represents the population found in Ireland, and exhibits minor colour differences with the subspecies rhamni.
The distribution of this species closely follows that of the larval foodplant and is rarely seen, therefore, in parts of Wales, northern England and Scotland.
This single-brooded butterfly can be found in most months of the year, although peak flight times are in April and May as the hibernating adults emerge, and again in August when their offspring reach adulthood. Autumn is a good time to see this species as the adults are avid nectar-feeders as they build up their fat reserves in preparation for hibernation. Subspecies: rhamni Subspecies: gravesi
The Brimstone is a great wanderer and can be found in almost any habitat, from chalk downland to woodland rides to gardens.
The main larval foodplants are Alder Buckthorn (Frangula alnus) and Buckthorn (Rhamnus cathartica).
The main nectar source is Thistles (Cirsium spp.). Betony (Stachys officinalis), Bluebell (Hyacinthoides non-scriptus), Carline Thistle (Carlina vulgaris), Dandelion (Taraxacum agg.), Devil's-bit Scabious (Succisa pratensis), Fleabane (Pulicaria dysenterica), Knapweeds (Centaurea spp.), Marjoram (Origanum vulgare), Primrose (Primula vulgaris), Ragged Robin (Lychnis flos-cuculi), Red Campion (Silene dioica), Selfheal (Prunella vulgaris) and Vetches (Vicia spp.) are also used.
Newly-emerged adults spend much of their time feeding, where they always settle with their wings closed, showing a preference for purple and nectar-rich flowers such as Thistle, Devil’s-bit Scabious and Buddleia. The long proboscis of this species also allows the butterfly to take nectar from flowers, such as Teasel, that are beyond the reach of many other butterfly species. With the approach of autumn, the butterfly settles down to hibernate – often among leaves of Ivy, Holly or Bramble. Adults emerging in the spring nectar on a variety of available flowers, such as Dandelion, Primrose, Cowslip, Bugle and Bluebell. They can often be seen resting with their wings at right angles to the sun to gain the full effect of the warm rays at this relatively-cool time of year. Males are the first to be seen in the spring and can be seen patrolling woodland edges, hedgerows and other habitats looking for a mate. When a virgin female is found, male and female fly high into the air, often out of sight, before tumbling back down into a bush where they then mate. Females are quite selective about the plants on which they lay – even on sites with many Buckthorns present, only a very small proportion of these will tend to be used by females in the area. Subspecies: rhamni
Subspecies: gravesi
Description to be completed
The skittle-shaped eggs are laid singly on the undersides of the youngest Buckthorn leaves at all heights on the foodplant. Although several eggs may be found together, this is either the result of different females using the same leaf, or the same female revisiting the spot at a different time. Newly-laid eggs are pale green, turning yellow and eventually grey as the larva develops inside. This stage lasts between 1 and 2 weeks.
The newly-emerged larva moves to the upperside of the leaf and starts to feed. Despite their superb camouflage, larvae can be relatively-easy to find since they nibble away the edges of the leaf on which they are resting and the feeding damage gives their presence away. When at rest, the larva has a curious habit of lifting the front half of its body off the leaf. The larva goes through 4 moults in total and this stage lasts about a month.
The fully-grown larva usually pupates away from the foodplant and, like the adult butterfly, the pupa is a curious shape, looking like a curled leaf. It is secured to the underside of a leaf or plant stem by a silk girdle and the cremaster. Before the adult butterfly emerges, the yellow spot found in the centre of the forewing can be clearly seen through the pupal case. The pupal stage lasts about 2 weeks.
No similar species found.
No videos are currently available for this species.
Click here to see the distribution of this species overlaid with specific site information. Alternatively, select one of the sites listed below.
The status of the Brimstone is considered stable and it is not, therefore, considered a species of conservation concern.
From The State of Butterflies in Britain and Ireland and the UK Biodiversity Action Plan (UK BAP) (2007 review).
The following links provide additional information on this butterfly.
The species description provided here has been derived from the author's own observations and the information contained in the following works:
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![Brimstone - imago - Holywells Park, Ipswich - 23-Jun-05 [Matt Berry]](phpBB/gallery/images/upload/ffa433b49cbff75580374798e1d5a316.jpg "Brimstone - imago - Holywells Park, Ipswich - 23-Jun-05 [Matt Berry]")
![Brimstone - imago - Holywells Park, Ipswich - May-06 [Matt Berry]](phpBB/gallery/images/upload/4ca897b571666bdb6499ec679388bd9c.jpg "Brimstone - imago - Holywells Park, Ipswich - May-06 [Matt Berry]")
![Brimstone - imago - Lough George, Co Clare - Unknown date [Adrian Riley]](phpBB/gallery/images/upload/4fe85ac0fae1458d7daca9a3eb4fe117.jpg "Brimstone - imago - Lough George, Co Clare - Unknown date [Adrian Riley]")
![Brimstone - ovum - Bathampton Down - 19-Apr-07 [Chris Isles]](phpBB/gallery/images/upload/222f32b2ef9a2f9974b266a0b50ed101.jpg "Brimstone - ovum - Bathampton Down - 19-Apr-07 [Chris Isles]")
![Brimstone - larva - Thatcham - 12-Jul-04 [REARED]](phpBB/gallery/images/upload/615c90aedbc8a2fe2ce6309f049e548e.jpg "Brimstone - larva - Thatcham - 12-Jul-04 [REARED]")
![Brimstone - pupa - Thatcham - 25-Jul-04 [REARED]](phpBB/gallery/images/upload/7c6b3ae860c87716071ad2f18da7866b.jpg "Brimstone - pupa - Thatcham - 25-Jul-04 [REARED]")
![Brimstone - pupa - Thatcham - 31-Jul-04 [REARED]](phpBB/gallery/images/upload/9eb2dfb6572af8d368ed2a4ea0dd30b5.jpg "Brimstone - pupa - Thatcham - 31-Jul-04 [REARED]")
