4 Mededeelingen van ’s Rijks Herbarium Leiden. 
cotype I saw is BArANSA no. 6a. In the BALANSA Herbarium at 
Leiden is a fine specimen showing this clearly, this plant growing 
with Panicum cordovense on the same rootstock. Prof. Mrz 
has neglected the work of American agrostologists. 
Panicum Schwackeanum, Mez, probably belonging to the 
section ,Parvifolia", cannot be recognized from the very short 
and bad description given by MEZ. - 
Panicum errabundum, HrrcHc. is allied to the Panicum 
helobium, Mez. This species differs only by the firm hairy 
blades, but than this character is also given in the description of 
the Panicum helobium (,laminis utrinque pilosis vel glabris"). 
Panicum helobium is according to the cotypes a variable 
species having glabrous or pubescent and thin or firm blades. It is 
interesting to remark that Panicum parvifolium presents the 
same phenomenon and it is very probable that extensive fieldstudy 
will prove that this species is also a mixtum. 
