Definition of spine

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Categorized under "General"

Definition as written by Plant_Geek:

A rigid, sharp pointed, deep seated outgrowth from the stem, not pulling off with the bark as a prickle does. Differs from a thorn in not having a vascular system.

Definition as written by Xenomorf:

A modified leaf, usually a stiff, pointed structure arising from an areole; compare central spine, radial spine.

Definition as written by Xenomorf:

The long pointed things in the photo below.

(Click for full-size)

Definition as written by Monocromatico:

Spines can also be several modified structures, like leaves (Cactaceae), stipules (some Leguminosae and Euphorbias), bracts (I can´t think of any now...) or vascularized projections from the stem (Smilax and Dioscorea).

Must not be confused with thorns, as explained above.

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