Chromosome Numbers of Spermatophytes, Mostly Californian

Studies of chromosomes are normally confined to limited taxonomic groups, for very good reasons. Studies thus restricted are not only apt to yield more accurate results than those concerned with a wide variety of plants, but the patterns within these groups may become obvious with relatively little effort. One unfortunate effect of this kind of orientation, however, has been that many groups of plants have never or very rarely been examined cytologically, and many interesting facts thus remain unknown.