Definition of "ilex"

There is a point of strand / Near Vada's tower and town; and on one side / The treacherous marsh divides it from the land, / Shadowed by pine and ilex forests wide, / And on the other creeps eternally, / Through muddy weeds, the shallow, sullen sea.

1818 (date written), Percy Bysshe Shelley, “Mazenghi”, in Mary W[ollstonecraft] Shelley, editor, Posthumous Poems of Percy Bysshe Shelley, London: […] [C. H. Reynell] for John and Henry L[eigh] Hunt, […], published 1824, stanza 9, page 259

Many nights, though autumnal mists were spread around, I passed under an ilex—many times I have supped on arbutus berries and chestnuts, making a fire, gypsylike, on the ground […]

1826, [Mary Shelley], chapter X, in The Last Man. […], volume III, London: Henry Colburn, […]

Sometimes I lost track of them and had to hunt round in a circle, thrusting through sharp-scented bushes, scratching myself on various plants which were still new to me: resinaceous rock-roses, juniper, ilex [translating chênes verts], yellow and white asphodel.

1962, Simone de Beauvoir, translated by Peter Green, The Prime of Life, Cleveland, OH: The World Publishing Company, translation of La Force de l'âge, page 77