366 THE ORCHID REVIEW. 
The following are believed to be natural hybrids, their supposed parents 
being placed in the two right-hand colums :— 
P. X siamense, Rolfe, derived from P. callosum and P. Appletonianum. 
P. x Petri, Pfitz., S » P..Dayanum ,,. P. virens. 
P. X Littleanum, Rolfe, oe Pate Ai ;, P. Lawrenceanum. 
P. X Kimballianum, Rolfe, ,, a », P. Rothschildianum, 
This completes the outline of the Bdborter Diandre, the genera and 
species being arranged as far as possible in systematic order, and by the aid 
of the keys it will be possible for anyone to find the name and position of 
any doubtful species they may possess. Such an arrangement has never 
before been given, and other details, such as full descriptions, references to 
figures, geographical distribution, &c., can all be found in the various works 
devoted to the subject. In order to prevent any uncertainty, it may be 
pointed out that the specific names are the same as those by which they 
have previously been known under other genera. With respect to 
Selenipedium, it may be asked why the name was not retained for the 
cultivated species now ranked under Phragmipedium, rather than for the 
other group. To which it must be answered that neither the name nor 
the character given by Reichenbach belong to the former. The name 
alludes to the small lip (selents, a little crescent), and the character of having 
round, crustaceous, Vanilla-like seeds is only found in Selenipedium as now 
limited. Reichenbach spoke of it as occurring in two species (S. palmifolium 
and S. Chica), and the further remark, “perhaps in all the species,” has 
proved erroneous. The amended spelling, Cypripedilum, Selenipedilum, I 
see no reason to adopt (this question has been fully discussed by Buser in 
Bull. Herb. Boiss., 11., p. 642), and although Paphiopedilum was the original 
spelling in this case, it is clearly advisable that the termination should be 
uniform in the four genera. 
It may be i g to the above with a few remarks 
about the remaining great suborder Monandre, and its relationship to the 
Diandre. It differs essentially in having only a single perfect stamen,— 
the median one of the outer staminal whorl ;—by the pollen grains being 
compound, and variously agglutinated together into masses, or pollinia; 
and by one of the three stigmas being modified into a special organ, called 
the rostellum, which serves the purpose of secreting the viscid matter by 
which the pollinia are attached to the bodies of insects which visit the 
flowers ; and also, in the majority of cases, of preventing the pollinia from 
reaching the stigma of the same flower. The column is also generally 
much more developed, owing to the elongation of the disc-like base. 
It may be divided into tribes and genera, like the Diandra, but the 
only point which concerns us now is the exact point of contact with the 
latter. Dr. Pfitzer, who has attempted an arrangement of the Order with 
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