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Rules for the design of description for plant images: https://translate.google.com/translate?sl=ru&tl=en&u=https://www.plantarium.ru/page/help/service/pictures.html

Both Allium nevskianum and Allium alexeianum although superficially something similar, both are different not only by morphology and growing habitats in the wild but also genetically, and they are different in cultivation, too, so joining of both under one name is incorrect. See WCSP and IPNI. Best wishes Ruksans

Do you mean that this particular plant should be assigned to A. nevskianum if it is recognized as an independent species?

This comment have to be placed in discussion of taxon (here it will be lost and ignored with hight probability). To start/view discussion of taxon click "Начать обсуждение" or "Обсуждение" (with "bubble" icon) on the left pane of page: https://www.plantarium.ru/page/view/item/1869.html

Yes, this one picture and another one of same plant in cultivation.

Janis, could you add information on the date of this photo (year, month...)?

1982, the first week of May, Expedition to CA together with Tallinn BG.

This information have to be added in description of the photo, not in discussion. Please, do it. See https://translate.google.com/translate?hl=&sl=ru&tl=en&u=https://www.plantarium.ru/page/help/service/pictures.html