He states that the germ is never to be seen in the seed till the apices (anthers) shed their dust; and that if the stamina be cut out before the apices open, the seed will either not ripen, or be barren if it ripens.
Sepals are generally of a more or less oval, elliptical or oblong form, with their apices either blunt or acute.
This union generally takes place at the base, and extends more or less towards the apex; in Phyteuma the petals are united at their apices also.
In their direction they are erect or reflexed (with their apices downwards), spreading outwards (divergent or patulous), or arched inwards (connivent).
Usually dilated and coloured at the apex; the apices are usually cemented together into a definite layer, the epithecium (fig.
The perception of the changes, or, in other words, the reception of the stimulus, is associated for example, with the tips of roots and the apices of stems. The first recognition of a specially receptive part was made by Charles Darwin, who identified the perception of stimulation with the tip of the young growing root.
In these instances most of the flowers were abortive, but a few were fertile, which he attributes to the dust of the apices having been wafted by the wind from other plants.