spadix

1. Leaves and Inflorescence of the Arum maculatum, 2. Underground root-stock, 3. Lower part of spathe cut open, 4. Spike of fruits- showing in succession (from below) female flowers, male flowers, and sterile flowers forming a ring of hairs borne on the spadix.

In botany, a spadix (pl. spadices) is a type of 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 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 dioecious species.

Gallery

Elephant ear or ape flower (Xanthosoma roseum) with a white spadix partially surrounded by a green-, rose-, and cream-colored spathe	Anthurium scherzerianum inflorescence with spathe and spadix.	Spadix of Spathiphyllum floribundum.	Titan arum (Amorphophallus titanum) spadix at the United States Botanic Garden
Flamingo Lily (Anthurium andraeanum) at the United States Botanic Garden	Jack in the Pulpit (Arisaema triphyllum) in the Allegheny National Forest, Pennsylvania)	Calla lily (Zantedeschia aethiopica) in Funchal, Madeira