Allium macranthum is an Asian species of wild onion native to Bhutan, Sikkim, Gansu, Shaanxi, Sichuan and Tibet. It grows in wet places at elevations of 2700–4200 metres.Flora of China v 24 p 176 Allium macranthumNoltie, H.J. (1994). Flora of Bhutan 3(1): 1-456. Royal Botanic Gardens, Edinburgh
Allium macranthum has short, thick roots and a cylindrical bulb. Scapes are up to 60 cm tall. Leaves are flat, long, and thin, about the same length as the scapes but less than 2 cm across. Umbels have only a few purple, bell-shaped flowers.Baker, John Gilbert. 1874. Journal of Botany, British and Foreign 12(142): 293.Regel, Eduard August von. 1884. Trudy Imperatorskago S.-Peterburgskago Botaničeskago Sada 8: 658.Augustin Abel Hector Léveillé. 1913. Repertorium Specierum Novarum Regni Vegetabilis 12(325–330): 288.line drawing of Allium macranthum, Flora of China Illustrations vol. 24, fig. 170, 1-4 photo of herbarium specimen at Missouri Botanical Garden, collected in Bhutan, Allium macranthum
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