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RED-LEAVED ROSE

REDLEAF ROSE

Rosa glauca

Rose Family [Rosaceae]

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category
category8Shrubs
 
category
category8Deciduous
 
category
category8Broadleaf
 
status
statusZneophyte
 
flower
flower8bicolour
 
flower
flower8mauve
 
inner
inner8white
 
morph
morph8actino
 
petals
petalsZ5
 
stem
stem8round
 
stem
stem8spines stem8thorns
spines
contact
contactZlowish
 

6th June 2011, Bolsterstone, Nr. Sheffield. Photo: © RWD
The whole plant is suffused with a beetroot-red colouring that makes what would otherwise be green leaves look darker and redder.


6th June 2011, Bolsterstone, Nr. Sheffield. Photo: © RWD
The flowers are mauve fading to white in the centre, a little like those of Wood Crane's-bill. The leaves a dark glaucous colour with beetroot undertones and fine teeth mostly at the far end.


6th June 2011, Bolsterstone, Nr. Sheffield. Photo: © RWD
The stems are beetroot red.


6th June 2011, Bolsterstone, Nr. Sheffield. Photo: © RWD
Flowers have five somewhat irregular petals.


6th June 2011, Bolsterstone, Nr. Sheffield. Photo: © RWD
And a multitude of stamens bearing cream-coloured pollen. Note the long narrow hairy sepals behind which taper to a point.


6th June 2011, Bolsterstone, Nr. Sheffield. Photo: © RWD
Sepals, which are hairy and green, are even longer here.


6th June 2011, Bolsterstone, Nr. Sheffield. Photo: © RWD
The hip is beetroot-coloured whilst the sepals of un-opened flowers are long and red. Note new leaves emerging are reddish.


6th June 2011, Bolsterstone, Nr. Sheffield. Photo: © RWD
Both beetroot-coloured hips and the red sepals have hairs with a blob on the end. Sepals green and hairy on the inside.


6th June 2011, Bolsterstone, Nr. Sheffield. Photo: © RWD
The underside of the leaves is a lighter shade of same.


6th June 2011, Bolsterstone, Nr. Sheffield. Photo: © RWD
Leaves pinnate, ending in a triplet, with fine forward-pointing teeth mainly beyond halfway. red stems.


6th June 2011, Bolsterstone, Nr. Sheffield. Photo: © RWD
The stem barbs are few, straight, long and narrow, and red. Very sharp!


This rose is not listed in the BSBI site, so it is not known which, if any, other Roses it will hybridize with. It may, or may not, grow wild.

It certainly looked as though it was growing wild, being in a hedrerow on top of the moors beside a track backing onto farmers fields. But as with all tracks, habitation is not far away.

The flower, having mauve petals with white centres, is reminiscent of those of Wood Crane's-bill.

Uniquely identifiable characteristics

Distinguishing Feature : Leaves suffused through with a weak beetroot colouring making them a muddy green, or dark glaucous.

RUBIXANTHIN & CRYPTOXANTHIN


 Rubixanthin is an orange-red Xanthophyll and carotenoid pigment that is isomeric with Cryptoxanthin both of which are present in the hips of many Roses, including probably Red-leaved Rose. Rubixanthin lacks a ring at the far end, which has been un-folded and now forms an extended linear section. It is also found in the flowers of the orange-red coloured French Marigold (Tagetes patula) which also grows wild in the UK. In the human body ot is converted into Vitamin A, aka Retinal, which is one half of the molecule but with two extra OH moieties.

Rubixanthin is not soluble in water, but forms deep-red needle crystals from a benzene methanol solution, and orange crystals from a benzene petroleum ether solution. Licensed as a food colourant called Natural Yellow 27 (E-number E161d) in Australia and New Zealand it is not licensed in the EU nor the USA.

Rubixanthine should not be confused with Rhodoxanthin, another carotenoid.


  Cryptoxanthin is isomeric with Rubixanthine and is present in the hips of many roses, and but unlike Rubixanthin, is almost symmetrical, apart from an OH group on one of the rings. It is also present in the flowers ofJapanese Lantern (Physalis alkekengi) and other Physalis species as well as in the yolks of eggs, butter, orange rind, apples and papaya. It is identical to β-Carotene apart from the addition of the -OH group on the ring, and indeed, in the human body, it is converted into Vitamin A aka Retinol, and is thus considered as one of the provitamin A's. It too is used as a food colourant under the name E161c but is not approved for use within the European Union nor USA.


  Rosa glauca  ⇐ Global Aspect ⇒ Rosaceae  
genus8Rosa
Rosa
(Roses)

RED-LEAVED ROSE

REDLEAF ROSE

Rosa glauca

Rose Family [Rosaceae]

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