Leaf base often narrowed into a petiole, spurless.
基部通常缩小成为柄,无距。
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That this is the origin of the caudicle, even when of considerable length and highly developed, we have good evidence in the aborted pollen-grains which can sometimes be detected embedded within the central and solid parts.
这就是叶柄起源, 即使在叶柄相当长且高度发达情况下,我们在花粉粒败育中也有很好证据, 有时可以检测到花粉粒嵌在中央和实心部分中。