TY  - BOOK
AU  - Gunn,Charles R.
ED  - United States Department of Agriculture.
TI  - Families and genera of Spermatophytes recognized by the Agricultural Research Service
T2  - Technical Bulletin
U1  - 589.092 
PY  - 1992///
CY  - Springfield, VA
PB  - United States Department of Agriculture, 
KW  - ESPERMATOFITAS
UR  - https://www.cicy.mx/sitios/sib/doctoelectronico/10138.pdf
ER  -