Tauschia Schlecht. Both 7’ bicolor and T. tarahumara 
were previously uncounted. Five other species of the 
genus have revealed only n=11 and n=22, so the count 
of n=44 for 7. tarahumara, a probable octoploid, rep- 
resents a new polyploid level for the genus. 
Arracacia Baner. There is no previous chromosome 
count for A. edulis, a species which has been placed al- 
ternately under T'auschia. The complement of 72=20 is 
equally discordant in both genera. The fifteen specific 
taxa of Arracacia examined heretofore have all shown a 
haploid number of 22, except for one unexplained occur- 
rence each of the numbers 14 and 82. 
Ligusticum L. The count of n=11 for L. Porter, 
which has been made before, agrees with findings on 
some 16 species of this cireumboreal genus, all of which 
showed n=11, n =22, or 2=33, save for an anomalous 
n=12 and one n=27. 
Pseudocymopterus C. & R. The count of 2=11 for 
P. montanus coincides with earlier findings for this genus 
and species. 
Prionosciadium S$. Wats. Of eight taxa of this genus 
counted, six have n=22, two have n=21. A count of 
22 for P. madrense conforms to earlier information. 
n= 
gryngium L. Of the six counts reported here, only 
that for #. Gentryi, n=7, is new. From some 100 spe- 
cies that have been counted in this very distinctive cos- 
mopolitan genus, it seems clear that the basic number is 
n=8. However, there are descending aneuploid series 
extending to n=7, 2 =6, or even nm=5 in both hemi- 
spheres, sometimes in what appears to be the same spe- 
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