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's yield.
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 (Fig.
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 are Lipocarpha.
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 [3].
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.