achenes

Over the years, the shape of the inflorescence changes according to the number of achenes that have been dispersed form the peripheral zone.
在以后的多年里，随着外围的种子逐渐被传播，花序的形状发生变化。
Receptacle glabrous, rarely with a few hairs; achenes glabrous.
We conclude that the mucilage layer of A. sphaerocephala achenes plays an important ecological function in seed dispersal and germination.
研究表明：瘦果的粘液物质对白沙蒿种子的传播与萌发具有重要的生态意义。
The main characters of this species are small leaflets and compressed achenes with narrow, lateral wings.
本种的主要特征是小的小叶和压扁的瘦果具狭窄的，侧翅。
Stigmas capitate. Achenes exceeding persistent perianth, brown, shiny, broadly ellipsoid, trigonous.
柱头头状瘦果超过宿存花被，棕色，发亮，宽椭圆形，三棱。
In very old inflorescence, however, from which the achenes have already dispersed, the mechanism no longer works and the bracts are shed.
然而，在很老的花序里，瘦果早已完全传播，这种机制就不再起作用，苞片闭合。
This effect of position ensures that achenes of each whorl germinate when they reach the periphery and are disconnected.
这种位置效应确保了每一圈的瘦果在到达外围并且分离的时候才萌发。
Achenes narrowly ellipsoidal, tuberculate.
The central achenes are the last to go.
Achenes grooved; angles rounded below middle, sharply acute above; pedicel articulate at middle.
开槽的瘦果；有棱圆形的中间以下，在上面锐锐尖；花梗有节在中部。