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having no petals.
Historical Examples

Rivina, ri-vī′na, n. a genus of apetalous plants, the pokeweed family.
Chambers’s Twentieth Century Dictionary (part 3 of 4: N-R) Various

Our genera are apetalous and with the calyx free from the ovary.
The Manual of the Botany of the Northern United States Asa Gray

Stackhousia juncea, according to Clarke, has mixed with its perfect flowers a number of apetalous blossoms destitute of anthers.
Vegetable Teratology Maxwell T. Masters

apetalous Trees or Shrubs, having their flowers destitute of corolla; as the box.
Lives of Eminent Zoologists, from Aristotle to Linnus William MacGillivray

apetalous flowers occur in the Ranunculace and Caryophyllace.
The Manual of the Botany of the Northern United States Asa Gray

I desire now to call attention to chemical groups under the apetalous plants having simplicity of floral elements.
Scientific American Supplement, No. 623, December 10, 1887 Various

Thus, certain species of Helianthemum are apetalous in Lapland.
Vegetable Teratology Maxwell T. Masters

Of apetalous Gymnoblasts, some important species are to be recorded, since they form the chief pride of the forests.
The Highlands of Ethiopia William Cornwallis Harris

There is also a variety which is apetalous, or has its petals reduced to mere rudiments.
The Variation of Animals and Plants Under Domestication, Vol. I. Charles Darwin

Salicornia, sal-i-kor′ni-a, n. a genus of apetalous plants—the glass-wort, marsh-samphire.
Chambers’s Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) Various

adjective
(of flowering plants) having no petals