Notes on dédoublement. 
AUG. F. FOERSTE. 
Trillium sesstle. Three interesting cases of more or less 
quaternate structure in this species of Trillium have recently 
come under our observation. One of these is quite simple in 
character. First came a pair of opposite broader leaves, fol- 
lowed in decussating order by a pair of narrower leaves, an 
outer pair of sepals, an inner pair of sepals, then by a set of 
four petals decussating with the two sets of sepals taken asa 
whole, next by four outer stamens, these by four inner sta- 
mens, but of practically similar insertion, and lastly by an 
ovary which bore four distinct styles. 
Mr. Ed. Rynzrson, teacher of botany at the Dayton High 
School, found a vastly more interesting case which he placed 
at the writer's disposal. To appreciate this fully it must be 
remembered that the sepals of this species are green and the 
principal veins are longitudinal and parallel, while the petals 
are dull purple brown in color and have veins which incline 
towards either side of the petals and 
show more or less of an anastomosing 
structure. First there is a pair of op- 
posite leaves (fig. I), next a pair of 
slightly narrower leaves. With these 
four leaves as a whole, the sepals if 
there be four acting together as a 
whorl should decussate. And with 
these four sepals four petals should 
-_* decussate. To determine how a plant 
with only six floral envelopes could manifest this tendency 
might puzzle a mathematician, but the question has been 
solved by this curious plant ina very odd manner. 
On either side of one of the second pair of leaves is found 
a sepal in decussating position. On either side of the opp? 
site leaf is found a floral envelope in position a petal but in 
appearance partly petal and partly sepal. One of these 1S 
colored and veined like a petal on the outer half, and colored 
and veined like a sepel on the inner half, so that this innet 
half falls in the proper space to represent a third sepal. The 
other floral envelope is colored and veined like a petal on the 
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