cocklebur

名词 n.
中文释义

英文释义

名词 n.
  1. Any of the coarse composite weeds of the genus Xanthium, with a prickly fruit.
    — Fig. 1.—Spiculated pollens of ragweeds (ambrosias) low in protein. […] In the cocklebur (Xanthium americanum) and the rough wild elder (Iva ciliata), the spicules are shorter, being 0.7 and 0.5 microns, and the reaction is proportionately less active than with the ragweeds (ambrosias). […] While the grass pollens have so light a coat that they are frequently crushed in the ordinary process of mounting, the ragweed (ambrosias) pollen grains resist pressure between two glass slides carried to the point of crushing the glass.

词形变化

cockleburs plural

词源

From cockle + bur.
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