In the genus _Anemone_, Janczewski obtained the same results. Some characters of course may split, but others remain constant, and when only such are present, hybrid races result with new combinations of characters, which are as constant as the best species of the same genus. The hybrids of Janczewski were quite fertile, and he points out that there is no good reason why they should not be considered as good new species. If they had not been produced artificially, but found in the wild state, their origin would have been unknown, and there can be no doubt that they would have been described by the best systematists as species of the same value as their parents. Such is especially the case with a hybrid between _Anemone magellanica_ and the common _Anemone sylvestris_. Starting from similar considerations Kerner von Marilaun pointed out the fact long ago that many so-called species, of rare occurrence, [267] standing between two allied types, may be considered to have originated by a cross. Surely a wide field for abuse is opened by such an assertion, and it is quite a common habit to consider intermediate forms as hybrids, on the grounds afforded by their external characters alone, and without any exact knowledge of their real origin and often without knowing anything as to their constancy from seed. All such apparent explanations are now slowly becoming antiquated and obsolete, but the cases adduced by Kerner seem to stand this test. Kerner designates a willow, _Salix ehrhartiana_ as a constant hybrid between _Salix alba_ and _S. pentandra_. _Rhododendron intermedium_ is an intermediate form between the hairy and the rusty species from the Swiss Alps, _R. hirsutum_ and _R. ferrugineum_, the former growing on chalky, and the other on silicious soils. Wherever both these types of soil occur in the same valley and these two species approach one another, the hybrid _R. intermedium_ is produced, and is often seen to be propagating itself abundantly. As is indicated by the name, it combines the essential characters of both parents. _Linaria italica_ is a hybrid toad-flax between _L. genistifolia_ and _L. vulgaris_, a cross which I have repeated in my garden. _Drosera obovata_ [268] is a hybrid sundew between _D. anglica_ and _D. rotundifolia_. _Primula variabilis_ is a hybrid between the two common primroses, _P. officinalis_ and _P. grandiflora_. The willow-herb (_Epilobium_), the self-heal (_Brunella_) and the yellow pond-lilies (Nuphar) afford other instances of constant wild hybrids. Macfarlane has discovered a natural hybrid between two species of sundew in the swamps near Atco, N.J. The parents, _D. intermedia_ and _D. filiformis_, were growing abundantly all around, but of the hybrid only a group of eleven plants was found. A detailed comparison of the hybrid with its parents demonstrated a minute blending of the anatomical peculiarities of the parental species.