FOUQUIERIACEOUS SPINE

Fouquieraceous spine (Fouquieria): a spine forms by the fusion (adnation) of stem tissue to the abaxial surface of the petiole, with the tip being the abaxial surface of the midvein.

Examples:

1. Petiole abscising during the formation of a new spine; another species
2. Leafy older stem
3. Closer view of leafy stem of an arborescent species of Fouquieria
4. Fouquieria fasciulata

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