any of several varieties of dahlia having large flower heads with numerous rays incurved to a quill-like form.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use cactus dahlia in a sentence
The cactus dahlia, usually red, has put out flowers almost orange and with exterior florets sometimes nearly yellow.
If you have not tried the Countess of Lonsdale you should; it is a cactus dahlia and a very free bloomer.