378 BOTANICAL GAZETTE [NOVEMBER 
(Cirsium palustreXspinosissimum, Cirsium heterophyllumX spinosissimum, 
Achillea moschataXnana, Achillea macrophyllaXmoschata, Carex echinataX 
foetida, ferner Melandryum albumXrubum, hier eine vollkomme gleitende 
Reihe von einer Art zu andern). Dabei ist mir zweifelhaft gebleiben, auch 
nur bei einzigen dieser Bastarde in einem einzigen Merkmalspaar ein wirkliches 
Dominiren verkommt, ganz sicher ist, dass in fast allen Punkten, in denen die 
Eltern differiren, der Bastard die Merkmale beider Eltern zeigt, jedes abge- 
- schwiacht, wenn auch in verscheidenem Grade. 
Other paragraphs might be cited which bear more or less upon 
the subject, but I shall cite but the closing line of the article. 
Die Aufdeckung der Mendel’schen Regeln wird also kaum dazu beitragen, 
dass von jetzt ab Speciesbastarde und Rassenhbastarde in einem Topf geworfen 
werden, und man statt dessen nur von Mono- Di- etc., Polyhybriden sprechen 
wird, sie wird im Gegentheil wohl der Anfang fiir eine scharfere Trennung der 
beiden sein. 
The Rosaceae, which is the last of the families mentioned as 
being a perplexing problem for the systematist, has among its 
many genera several whose species are very much unséttled. Of 
these Crataegus, Rosa, and Rubus may be mentioned as distinctive. © 
With these 3 genera there have been great changes wrought within 
the last few years. Taking Crataegus, for example, we find a very 
interesting account of its present condition by Brown (32). When 
Gray’s Field, forest, and garden botany was published in 1857 
there were listed in it but 12 species and 2 varieties. Again, in 
Gray’s Manual of botany of 1867 we find only 1o species and 4 
varieties given. It was not until after the publication of CHAPMAN’S 
Flora of the southern United States in 1897, which gave but 15 
species within its range, that we find any great increase in the 
number of species. Since then many species have been described. | 
In fact, since 1896 there have been, according to Brown, 864 
species and 18 varieties described. Where will this species making 
end? As Brown states, “‘Why did not the systematists discover 
this great number of species before? Have they been recently 
hybridizing? Undoubtedly a part of the great increase may be 
explained by a more intensive study upon the part of the systematic 
botanist, but does this account for it all?’”’ BrarNerp, in reply to 
Brown’s inquiry, states that “the Rosaceae of all orders is the 
most predisposed to hybridize. Rosa, Rubus, Geum, Amelanchier, 
