CUT-LEAVED DEAD-NETTLE

Lamium hybridum

Mint / Dead-Nettle Family [Lamiaceae]

month8mar month8march month8apr month8april month8may month8jun month8june month8jul month8july month8aug month8sep month8sept month8oct

status
statusZarchaeophyte
flower
flower8lilac flower8pink
inner
inner8purple
inner
inner8red
morph
morph8zygo
petals
petalsZ2
type
typeZtieredwhorls
stem
stem8square
stem
stem8hollow

7th Aug 2007, arable fields, Burscough Bridge, Lancs. Photo: © RWD
A lovely clump interspersed by some yellow Asteraceae species.


13th Sept 2018, arable field, Upholland, Wigan, Lancs. Photo: © RWD


7th Aug 2007, arable fields, Burscough Bridge, Lancs. Photo: © RWD
The stems are square and hollow inside.


6th June 2015, arable field, Aughton, Ormskirk, Lancs. Photo: © RWD
Very much like Red Dead-Nettle (Lamium purpurum), the only definitive difference being in the shape and size of the teeth on the leaves.


13th Sept 2018, arable field, Upholland, Wigan, Lancs. Photo: © RWD


7th Aug 2007, arable fields, Burscough Bridge, Lancs. Photo: © RWD
Top down view.


13th Sept 2018, arable field, Upholland, Wigan, Lancs. Photo: © RWD


6th June 2015, arable field, Aughton, Ormskirk, Lancs. Photo: © RWD
The flowers are much the same colour and size as those of Red Dead-Nettle (both corollas 10-18mm [up to 20mm])


7th Aug 2007, arable fields, Burscough Bridge, Lancs. Photo: © RWD


6th June 2015, arable field, Aughton, Ormskirk, Lancs. Photo: © RWD
But unlike Red Dead-Nettle where the teeth on the leaves are crenate to crenate-serrate and less than 2mm long, those on Cut-leaved Dead-nettle are deeply serrate and with many teeth longer than 2mm.


6th June 2015, arable field, Aughton, Ormskirk, Lancs. Photo: © RWD
Whereas the leaves near the top of Red Dead-Nettle are much more rounded, those near the top of Cut-leaved Dead-nettle are pointedly serrate and more deeply cut.


6th June 2015, arable field, Aughton, Ormskirk, Lancs. Photo: © RWD
The corolla tube of the flowers comes in the same range of sizes as those of Red Dead-Nettle, being 7-12mm long.


6th June 2015, arable field, Aughton, Ormskirk, Lancs. Photo: © RWD
Sepal tubes purple-brown and with 5 long teeth, the total length of the sepal tubes are 5-7mm (up to 10mm) which means that they can be slightly longer than those on Red Dead-Nettle which are from 5 - 7.5mm long, but there's not a lot in it!


13th Sept 2018, arable field, Upholland, Wigan, Lancs. Photo: © RWD


13th Sept 2018, arable field, Upholland, Wigan, Lancs. Photo: © RWD


13th Sept 2018, arable field, Upholland, Wigan, Lancs. Photo: © RWD


6th June 2015, arable field, Aughton, Ormskirk, Lancs. Photo: © RWD
Leaves hairy, with longer hairs at the edges. Flowers with two splayed-out lower lips, just like those of Red Dead-Nettle.


6th June 2015, arable field, Aughton, Ormskirk, Lancs. Photo: © RWD
The purple-pink corolla with two sets of anthers within the top of the hood. A final difference between the two Dead-nettles is that the flowers often do not even open on Cut-leaved Dead-nettle - note the two un-opened flowers in their purple-brown sepal tubes.


6th June 2015, arable field, Aughton, Ormskirk, Lancs. Photo: © RWD
Note the 'green-X' centres of the sepal tubes. Are these also failed flowers? Or are they nascent fruits awaiting development?


6th June 2015, arable field, Aughton, Ormskirk, Lancs. Photo: © RWD
A typical more deeply-cut leaf without the crenate teeth of Red Dead-Nettle.


6th June 2015, arable field, Aughton, Ormskirk, Lancs. Photo: © RWD
The stems are square (and probably also hollow like the stems of Red Dead-Nettle). Rear of leaf showing [The ribbed stem of a Horsetail is on the right of it].


13th Sept 2018, arable field, Upholland, Wigan, Lancs. Photo: © RWD
Hydathodes at the tips of the leaf teeth, to dispose of excess water.


Easily mistaken for : Red Dead-Nettle (Lamium purpurum) where the major difference is only in the shape of the teeth on the upper leaves (see captions). In fact, it is so alike Red Dead-nettle that it is sometimes treated as a cut-leaved variety of that: Lamium purpureum var. incisum. Cut-leaved Dead-nettle is also sometimes reddish as some of the above photos show.

Your Author knows not why the scientific name of Cut-leaved Dead-nettle has the specific epithet 'hybridum' for he cannot find out what it is the hybrid of. Maybe the person who named it was mistaken in his belief?

Some similarities to: Henbit Dead-Nettle (Lamium amplexicaul), but just below the inflorescence that has a leaf which completely encircles the stem (it is amplexicaul). The leaves are also cut like those of Cut-leaved Dead-nettle, but the upper leaves are without stalks. The flowers also have a slightly longer corolla tube (10-14mm - but often much shorter and not opening either!) [as opposed to the 7-12mm corolla tube of Cut-leaved Dead-nettle] and the two lowest lobes of the flower have a reddish dot each.

Uniquely identifiable characteristics

Distinguishing Feature : The more deeply cut upper leaves which are never crenate (rounded at the end), but rather taper to a blunt tip.


  Lamium hybridum  ⇐ Global Aspect ⇒ Lamiaceae  

Distribution
 family8Mint / Dead-Nettle family8Lamiaceae

 BSBI maps
genus8Lamium
Lamium
(Dead-Nettles)

CUT-LEAVED DEAD-NETTLE

Lamium hybridum

Mint / Dead-Nettle Family [Lamiaceae]