Many investigators have determined that certain grasses are able to reproduce sexually as well as apomictically. Many hybrid forms showing a wide range of chromosome variability are able to reproduce themselves agamospermically (by seeds formed without fertilization). Some of these local races would seem to have a very special advantage in their struggle for life. Project Number 78.
"An Investigation of Modes of Reproduction in Grasses,"
Jackson Hole Research Station Annual Report: Vol. 1955
, Article 8.
Available at: http://repository.uwyo.edu/jhrs_reports/vol1955/iss1/8