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Spadix
In botany, a '''spadix''' (pl. ''spadices'') is a type of raceme|spike: an inflorescence with small flowers crowded on a thickened, fleshy axis. The term is applied to certain monocotyledons, especially members of the Family Araceae called arums or aroids. In these flower heads there is typically also a '''spathe''' (from Ancient Greek ''spathe'' "broad blade") present: a large, usually showy and solitary, bract that either subtends (lies just below) or partially encloses the spadix. The "flower" of the anthurium is a typical spadix with a large colorful spathe.
In Plant sexuality|monoecious aroids (possessing separate male and female flowers, but with both flowers present on one plant), the spadix is usually organized with female flowers towards the bottom and male flowers towards the top. In aroids with perfect flowers the stigma is no longer receptive when the pollen is released, thus preventing self-fertilization. There are also some Plant sexuality|dioecious species.
Gallery
Image:Arum flower.jpg|Elephant ear or ape flower (''Xanthosoma roseum'') with a white '''spadix''' partially surrounded by a green-, rose-, and cream-colored spathe
Image:Anthurium scherzerianum 2.jpg|Anthurium scherzerianum inflorescence with spathe and spadix.
Image:Spathiphyllum floribundum1.jpg|Spadix of Spathiphyllum floribundum.
Image:Titan-arum1web.jpg| Titan arum (Amorphophallus titanum) spadix at the United States Botanic Garden
Image:Flamingo Flower.JPG| Flamingo Lily (Anthurium andraeanum) at the United States Botanic Garden
Image:Jack in the pupit.jpg| Jack in the Pulpit (Arisaema triphyllum) in the Allegheny National Forest, Pennsylvania)
Image:Funchal - Zantedeschia aethiopica IMG 1904.JPG|Calla lily (Zantedeschia aethiopica) in Funchal, Madeira
Category: plant morphology
Category: Pollination
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Sources: StartLearningNow, Wikipedia | Usage license: GNU FDL
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