Question

What is unusual about the perianth of the Cactaceae?

   What is unusual about the perianth of the Cactaceae?

Plant Systematics

Plant Systematics

Michael G. Simpson 2nd Edition

Chapter 8, Problem 37

Instant Answer

Solved by Expert Sam Limsuwannarot

06/18/2020

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In the case of the Cactaceae family, there are a few unusual characteristics of their perianth: Show more…

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What is unusual about the perianth of the Cactaceae?

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Key Concepts

Floral Morphology

Floral morphology is the study of the structure, form, and arrangement of the parts of a flower. This field examines how floral parts such as the perianth evolve and adapt in different plant families. Understanding floral morphology is essential for interpreting unique adaptations like the undifferentiated perianth observed in the Cactaceae.

Cactaceae

Cactaceae, commonly known as the cactus family, are well known for their specialized adaptations to arid environments. Their flowers often exhibit unusual morphological traits compared to other flowering plants, such as a perianth composed entirely of tepals rather than distinct sepals and petals. This adaptation is a significant aspect of their evolutionary strategy.

Perianth

The perianth refers to the collective term for the outer parts of a flower, which in many species is divided into the calyx (sepals) and corolla (petals). However, when these parts are undifferentiated, they are generally called tepals. This concept is fundamental in understanding variations in flower structure across different plant families.

Tepals

Tepals are the undifferentiated segments of a perianth when there is no clear distinction between sepals and petals. They play a crucial role in groups where the typical division into calyx and corolla has been modified, and their presence is a key feature in recognizing unusual floral morphologies, such as those seen in the Cactaceae.

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