Spadix (botany)

: spadices /ˈspeɪdɪsiːz/ SPAY-dih-seez, /speɪˈdaɪsiːz/ spay-DY-seez) is a type of inflorescence having small flowers borne on a fleshy stem.

[1] In this type of inflorescence, the peduncle is thick, long and fleshy, having small sessile unisexual flowers covered with one or more large green or colourful bracts (spathe).

Typically, the stigmas are no longer receptive when pollen is released which prevents self-fertilization.

[citation needed] In many arums with unisexual (imperfect[2]) spadices, the upper portion of the spadix contains infertile male flowers[3][additional citation(s) needed] and is referred to as the appendix.

[4][5] The appendix in certain species, such as Amorphophallus paeoniifolius, is enlarged, highly modified and shows variability in shape.

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.
Diagram of spadix