[Studies on the pollen morphology of ten species of  Achillea].
OBJECTIVE
To study the pollen morphology of ten species of Achillea.


METHODS
The pollen morphology of ten species of Achillea was examined with LM and SEM.


RESULTS
The pollen grains were usually 3-colporate, subspheroidal. The exine ornamentation consisted of verrucate, spinulate and foveolate. But some differences in size, colpae and exine ornamentation were found.


CONCLUSIONS
The slight differences of the pollen morphology are useful to some extent for the classification of the ten species of Achillea.
Yang
Yan-fang
YF
School of Pharmaceutical Sciences, Peking University, Beijing 100083, China.
Ai
Tie-ming
TM
D031162:Achillea / Q000145:classification / Q000648:ultrastructure*; D008855:Microscopy, Electron, Scanning; D011058:Pollen / Q000648:ultrastructure*; D013045:Species Specificity