from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Arranged in or forming whorls or a whorl.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Forming whorls
from the GNU version of the Collaborative International Dictionary of English
- adj. Arranged in a transverse whorl or whorls like the rays of a wheel.
from The Century Dictionary and Cyclopedia
- Whorled; disposed in a verticil, as leaves or flowers; having organs so disposed.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. forming one or more whorls (especially a whorl of leaves around a stem)
Sorry, no etymologies found.
The panicle in _Sporobolus coromandelianus_ is pyramidal and the branches are all verticillate, the lower being longer than the upper.
Branches are capillary, stiff and spreading, horizontally verticillate or subverticillate, the lowest whorl consisting of five to sixteen or seventeen branches and the others from three to nine, shining, swollen at the point of insertion and provided with a glandular scar a little above the point of insertion; branchlets are very close, appressed to the rachis of the branch never drooping or spreading, each bearing two to five spikelets.
For example in the panicle of _Eragrostis Willdenoviana_, the branches are irregularly disposed, whereas in _Sporobolus coromandelianus_ the branches are verticillate.
Branches are effuse, fine, capillary (more so than in S. coromandelianus), obliquely ascending, never stiff and horizontal, verticillate or irregularly subverticillate, the lowest whorl of five to twelve and the others three to seven branches; the rachis of the branches is obscurely scaberulous, slightly swollen at the point of insertion; branchlets are never appressed to the branch, always drooping and spreading on all sides, and bearing two to four spikelets.
In the verticillate or simultaneous arrangement of leaves the case is somewhat different.
The tendency to petalification is, moreover, greater among those plants which have their floral elements arranged in spiral series, than among those where the verticillate arrangement exists; and in any given flower, if the stamens are spirally arranged while the carpels are grouped in whorls, the former will be more liable to petalody than the latter, and _vice versâ_.
In addition to these changes, which are those most commonly met with, the number of the parts of the flower is sometimes augmented, and a tendency to pass from the verticillate to the spiral arrangement manifested.
Again, the simultaneous evolution of the parts of the flower and their consequent verticillate arrangement, are often associated with the production of different forms from those characteristic of organs developed in succession, and, in consequence, arranged spirally.
Displacement of the parts of the flower from elongation of the receptacle is a not infrequent teratological occurrence, resulting sometimes in the conversion of the verticillate into the spiral arrangement.
If, on the other hand, the carpels be few in number, and placed in a verticillate manner, the axis then generally passes upwards without any change in the form or position of the carpels being apparent, as in a proliferous columbine, figured in the 'Linnean Transactions,' vol. xxiii, tab. 34, fig. 5.