Richard
A French botanist.
Rich.
Nor.
Nutt.
Ort.
Otth.
Otto.
Pall. turalist.
Panz. de Beauv.
Pers.
Pet.
Pet. Th.
Ph., Psh.
P. L.
Plin.
Plu.
Poit.
Poll.
Pour.
Raddi.
R. & S.
Risso.
R. L.
Rosc.
Rotb.
Roth, Rth.
Roxb., Rox.
AUTHORITIES FOR GENERIC AND SPECIFIC NAMES.