Stamens Positioned on One Side of Echinopsis Flowers

October 11, 2023



Photographer: Menashe Davidson  

Summary Author: Menashe Davidson   

The Echinopsis cactus, also known as the Easter Lily cactus or the hedgehog cactus, is a type of cactus that produces trumpet-shaped large blooms. The blooms are typically open in the morning and close in the evening, lasting for just one day before withering away. While watching the bloom of Echinopsis cacti in my home garden in Rishon LeZion Israel on April 23, 2023, I realized that the stamens are positioned on one side of the flower.

Echinopsis is a bisexual flower. The stamens are positioned on one side of the trumpet-shaped flower to prevent self-pollination and to facilitate cross-pollination. The style, which is the female reproductive organ in the center of the flower, is curved to one side, creating a landing platform for pollinators.  Also, there‚Äôs a temporal separation of the male and female reproductive organs within the same flower -- male reproductive organs (anthers) mature at a different time than female reproductive organs (stigma).

As shown above in the top photo, taken at 08:32 a.m. (local time), we see the style (long-tube connecting the stigma and the ovary) curved to one side, allowing open accessibility to both anthers and pollinators alike. On the bottom photo, taken 5 hours 41 minutes later, the style is straighter, and the stigma passage has been closed so that pollen can be received from visiting pollinators.


Rishon LeZion, Israel Coordinates: 31.9730, 34.7925

Related Links:

Nyctinasty in Cacti

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