Helleborus argutifolius (Introduced- USA/UK)

Helleborus argutifolius Viv., Fl. Cors. Prodr.: 8 (1824) (syn: Helleborus corsicus Willd. ex Mabille; Helleborus corsicus f. angustifolius Schiffn.; Helleborus corsicus f. latifolius Schiffn. ; Helleborus lividus subsp. corsicus (Briq.) P.Fourn.; Helleborus lividus var. serratifolius DC. ; Helleborus spinescens Tausch ex Schiffn. ; Helleborus trifolius subsp. corsicus Briq.; Helleborus trifolius var. serratifolius (DC.) Gürke); 

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Corse, Sardegna; Introduced into: Austria, France, Great Britain as per POWO;
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Ranunculaceae Week: Helleborus argutifolius cv Silver Lace from California:
Helleborus argutifolius Viv. cv. Silver Lace syn: Helleborus lividus subsp. corsicus (Willd.) Tutin; H. corsicus Willd.
Herbaceous plant with spinescent-dentate leaf segments which are usually three in number, paler green above; flowers up to 7 cm across, pale green or suffused with purple.
Photographed from SFO Botanical Garden in California in July, 2008.
Common name:  Corsican hellebore, the cultivar is known as Silver Lace

Ranunculaceae Week: Helleborus sp. for ID 050511MK1:
Please help to ID this Helleborus sp. I am not sure that this plant is found in (temperate) India. I photographed this at Cambridge city of UK on last week of March, 2011. Please resolve this ID.
.. indicated in earlier post that this resembles H. niger.

Helleborus argutifolius from California:GS08052025-1: 5 high res. images.
Helleborus argutifolius Viv., photographed from Fremont California

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References:

Catalogue of life  POWO