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Marjoram
From Cookipedia
Marjoram (Origanum majorana, Lamiaceae) is a somewhat cold-sensitive perennial herb or undershrub with sweet pine and citrus flavours. It is also called Sweet Marjoram or Knotted Marjoram and Majorana hortensis.
Marjoram is cultivated for its aromatic leaves, either green or dry, for culinary purposes; the tops are cut as the plants begin to flower and are dried slowly in the shade. It is often used in herb combinations such as Herbes de Provence and Za'atar.
Perhaps someone can help me out here: I am struggling to discover the true culinary distinction between marjoram and oregano. Chef
Alternatives
Oregano would be a reasonable substitute.
