Photo by Melody
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Definition of spine

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.

Thumbnail of spine by Xenomorf
(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 canīt 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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