from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Having no petals: an apetalous floret.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Having no petals.
from the GNU version of the Collaborative International Dictionary of English
- adj. Having no petals, or flower leaves. [See Illust. under anther].
from The Century Dictionary and Cyclopedia
- In botany, having no petals or corolla; pertaining to the Apetalœ.
- In the echinoids or seaurchins, having one of the five ambulacral rays more or less imperfectly developed.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. (of flowers) having no petals
Sorry, no etymologies found.
Vascular plants found in Mt. Assiniboine park include American alpine smelowskia Smelowskia calycina, Raynold's sedge Carex raynoldsii, Cusick's Indian paintbrush Castilleja cusickii, stalked-pod locoweed Oxytropis podocarpa, sub-alpine grassland Saussurea nuda and apetalous campion Silene uralensis attenuata.
The following references apply some to apetalous and others to dimorphic flowers, but it must be remembered that the latter plants are not necessarily wanting in petals or stamens, &c., though the functional activity of the parts may be impaired:
The flowers in this case were apetalous and imperfect.
Thus, certain species of _Helianthemum_ are apetalous in Lapland.
= -- Deficiency of the entire corolla occurs in conjunction with similar reductions in other organs, or as an isolated phenomenon in the many apetalous varieties of plants recorded in books.
The starting-point of the class, however, and the position within it of apetalous families with frequently unisexual flowers, have provoked much discussion.
All these plants are grouped under three main divisions: apetalous, monocotyledonous, and dicotyledonous; and these main divisions are further subdivided.
I desire now to call attention to chemical groups under the apetalous plants having simplicity of floral elements.
The highest apetalous plants contain camphors and oils; the highest of the monocotyledons contain a mucilage and oils; and the highest dicotyledons contain oils and special acids.
No plants containing saponin have been found among apetalous groups.