Decrease in head diameter, thousand achene
weight and number of achenes
with increasing plant population was also recorded by Al-thabet (2006).
The following observations were noted; Number of days taken to emergence, number of days taken to flower completion, number of days taken to maturity, number of plants m-2, Plant height at maturity, head diameter, number of achene
's per head, 1000-Achene weight and achene
Although, this winged structure aids in dispersal to some degree, we believe a primary function is to prevent the achene
from becoming buried too deeply in the sandy soil.
Description: Small, well-preserved, relatively smooth achenes
As a precaution to prevent mold, achenes
were surface sterilized with a 5% v:v sodium hypochlorite (household bleach) solution in distilled water for 5 min with agitation.
To characterize population differentiation in achene
and head traits morphologically, a correlation analysis and a principal component analysis were performed on the population means of the traits defined in the previous paragraph.
The weather (mainly the temperature and precipitation during the achene
filling period) affected the linoleic acid content of hybrids.
The only taxa where the developed prophyll accompanies the achene
Roasted and peeled, the achene
(true fruit) is considered a valuable delicacy for its taste and texture.
The fruit is a narrow five-lobed achene
[1 .The general practice of multiplication for most of the perennial ornamental plants is by the use of vegetative plant parts including stem, leaves, terminal buds and roots due to its simplicity and practicability in developing countries .
The obtained results revealed that there was a significant difference for days taken to flowering (DF), achene
's formation (DAF) and physiological maturity (DPM) and yield in both of the hybrids except, number of days to germination (DG.).
In addition to the small and rarely seen flowers, an unusual structure of the achene
provides an important taxonomic characteristic.