The IUPAC name for glycine is aminoethanoic acid.
Details about the structures of alpha,beta,and gamma glycines are given by the reference in the link below.
http://escholarship.org/uc/item/9rj2t1kn#page-1
These are three molecular crystal structures for Glycine, which is the IUPAC name. Quoting from T. Baraniraja &, P. Philominathan Journal of Minerals & Materials Characterization & Engineering, Vol. 10, No.4, pp.351-356, 2011, "Among all the amino acids glycine is the simplest one and it has three polymorphic forms alpha, beta and gamma. It is reported that alpha and beta forms of glycine crystallizes in centrosymmetric space group P21/c [3,4] ruling out the possibility of optical
second harmonic generation [5,6]. But gamma glycine crystallizes in noncentrosymmetric space group P31 making it a candidate for piezoelectric and nonlinear optical applications [7]. For diagrams and images see:-
https://www.google.ca/search?q=alpha+glycine+crystal&rlz=1C1GGGE___CA567CA567&espv=2&tbm=isch&tbo=u&source=univ&sa=X&ei=BWIAVO7dAoLKggTj0IGgBA&ved=0CFwQsAQ&biw=1232&bih=801
You might also find this useful.
http://www.jointlab.nsu.ru/resources/education/chemistry/glycine_ascona_2004_2.pdf
and http://en.wikipedia.org/wiki/Glycine
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