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Allium hollandicum is a bulb-forming perennial with scapes up to 90 cm (35 in) tall. It has long, flat, strap-shaped leaves up to 60 cm (24 in) long. Umbels are relatively small and spherical, up to 10 cm (3.9 in) in diameter, composed of many purple to reddish-purple star-shaped flowers appearing in late spring and early summer. [11] [12] [13]
A. hollandicum 'Purple Sensation' is one of the most popular and has been given an Award of Garden Merit (H4). [49] These ornamental onions produce spherical umbels on single stalks in spring and summer, in a wide variety of sizes and colours, ranging from white ( Allium 'Mont Blanc'), blue ( A. caeruleum ), to yellow ( A. flavum ) and purple ...
Allium aflatunense is a 0.9 m (36 in) tall bulbous perennial plant with basal, straplike leaves, and hollow, slightly ribbed scapes (flower stems). [1] The flower heads are dense, globular umbels, about 10 cm (4 in) across, made up of numerous star-shaped, purplish-pink flowers. [1] It flowers in May and June, with seeds ripening in August.
The number of accepted species in the genus Allium varies depending on the source, but as of November 2024, World Flora Online accepts 969 species, [3] while Plants of the World Online accepts 1077 species: [2]
An onion (Allium cepa L., from Latin cepa meaning "onion"), also known as the bulb onion or common onion, is a vegetable that is the most widely cultivated species of the genus Allium. The shallot is a botanical variety of the onion which was classified as a separate species until 2011.
Allium atropurpureum grows from a spherical to egg-shaped bulb. Its scape is up to 100 cm (39 in) tall. The green, [4] leaves are broadly linear, up to 7 mm across, tapering at the tip. [5] It blooms in late spring and early summer, [4] the umbel is hemispherical, with many dark purple flowers. Ovary is very dark purple, almost black.