122  Crocus  and  its  Adulterants.  {^Stim™' 
vessels  running  lengthwise  throughout  portions  of  the  flower, 
between  which  are  found  the  spiral  ducts,  the  whole  being  sur- 
rounded by  numerous,  matted,  one-celled,  colorless  hairs. 
The  shape  of  the  pollen  grains,  some  of  which  are  elliptical, 
together  with  the  large  number  of  grains  present  in  this  powder, 
PLATE  II. — At  Fragments  of  stigma  and  anther  and  pollen  grains  of  Crocus 
sativus,  L.;  B,  fragment  of  corolla  and  several  pollen  grains  of  Calendula 
officinalis,  L. ;  C,  fragment  of  corolla  and  some  pollen  grains  of  Carthamus  tinc- 
lorius,  L. 
forms  a  very  striking  characteristic ;  they  possess  spines  somewhat 
shorter  than  those  of  calendula,  but  more  numerous;  also  differing 
from  those  of  the  latter  in  that  their  method  of  arrangement  is 
scattered,  these  spines  measuring  2-38  mikrons,  the  grain  having  a 
diameter  of  60-69  mikrons,  with  a  wall  of  3-57  mikrons. 
