1896 | BOTANICAL PAPERS AT BUFFALO 229 
ent station doubtless contains the largest remnant of its former 
wide distribution. 
FRANCIS RAMALEY: On the stem anatomy of certain Onagrace@.— 
Seven genera of the disintegrated genus CEnothera, represented 
by thirteen species, were examined, with the following conclu- 
sions. There seem to be no marked anatomical characters of 
the stem which can be set down as belonging to one species and 
tono other. Plants of the same species growing under different 
conditions may present as great differences as are to be noted 
between species of comparatively remote genera. Slight differ- 
ences in the thickness of the various zones of tissue are evident, 
as are also variations in the size of the constituent elements in 
some of the tissues. The following generalizations may be 
drawn : (1) there is a striking similarity in stem structures 
throughout all the genera examined, and stem anatomy will not 
Serve to distinguish one genus from another; (2) the cortex 
. absent from old stems, being replaced by cork of characteris- 
he structure; (3) the normal phloem is in all cases poorly 
developed ; (4) bicollateral vascular bundles occur in all the 
species examined ; (5) intra-xylar phloem islands are found in 
the stems of all the robust species; (6) raphides of calcium 
Oxalate are Present in all cases, generally occurring in both cor- 
tex and pith, often in the pericycle and phloem. 
Cuartes E. Bessey: Zhe point of divergence of monocotyledons 
Bi dicotyledons.— In discussing this question I assume that it is 
ey to bring forward proofs as to the common origin of 
= = subclasses, Monocotyledone and Dicotyledone. It is 
Ca Ae in my opinion improbable, that some plants are 
®W included in them which have had an independent origin, 
” a will agree that after making the most liberal subtractions 
es Ee awe subclasses must still remain as two very closely 
them ie with essentially the characters now —— to 
that s € must bear in mind the well-known biological ie 
oe esneral, the relationship of allied groups is most mar e 
fen their lower members, that is, between those members 
