Torreya

Cover Torreya
Torreya
Torrey Botanical Club
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L. Lyon * noted a considerable difference in the development of the young sporophyte of B, obliquum on the one hand, and of B, simplex, B, neglectiim^ and B, virginianum on the other. This difference is interesting, but it cannot be con- sidered of value, even to separate the groups, unless it is shown to be constant for other and diverse species in both groups.
Two other groupings of the species have been made. Milde recognized two subgenera, Eubotrychium and Osmundopteris, The latter included
... only B, virginianum^ and was based on a very artificial character, the fact that in this species, the bud-sheath is partly open. Prantl divided the genus into groups nearly like those used here, but differed in placing B. virginianum with B.
ternatum and others of that type to form his subgenus Phyllo- trychium^ of which the principal distinctive character is the pos- session of a hairy bud. But B, virginianum seems to find its closest affinities with B, lanceolatum, and it is more reasonable to suppose that it represents an extreme development of this type than to relate it to the much more different B, ternatum group.


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