Morphology Of Flowering Plants Practice Test

Cylindrical thorns are characteristic of which genus?

Opuntia Euphorbia Citrus Bougainvillea

Correct Answer:

Euphorbia

Explanation:

Cylindrical thorns point to Euphorbia because many species in this genus have long, pencil-like spines along the stems. These spines are a common defensive feature and arise from the plant’s stems as true thorns, a form Euphorbia is well known for in its various succulent and dry-adapted species. By contrast, Opuntia bears spines on flat pads (cladodes) with spines that are often short or needle-like, while Citrus and Bougainvillea show different thorn forms that are not characterized by long cylindrical spines. So the cylindrical shape of the thorns aligns best with Euphorbia.

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