(2) For edaphic forms the term varietas followed by the ordinary ecological term such as ophytica halophytica, etc.
(3) For life-period forms varietas annua, biennia, etc.
(4) For seasonal forms varietas hyemalis, aestivalis, etc.
(5) For "lines" varietas Mendeliana followed by the letters of the Greek alphabet.
(6) For forms of inconstant species forma is the ultimate unit, to be grouped about recognizable lines of evolution in various ways. For this case it is not possible to suggest hard and fast rules. The study of these inconstant species is a special one, for which the name micro-systematics might be used. A good many European and American genera have been studied in minute detail, and recently Ammannia and Rotala in India by Blatter and Hallberg in Journ. Bom. Nat. Hist Soc.
C. For hybrids the usual multiplication sign.
It will be argued that we do not know which variant forms are to be assigned to which class in the above scheme. And this is true. But temporary ignorance is no valid excuse for continuing to confuse under one term phenomena which are not homologous. Gradually the truth will emerge.
