308 MR. W. B. HEMSLEY ON THE 
divided between us the remaining Monocotyledonous orders, in 
which our work was often materially assisted, but never super- 
seded, by previous monographs, Hooker prepared the Nudi- 
florous orders ( Aroidez and allies) and the A pocarpe (Alismaceg, 
Naiadacee, and allies), the others falling to my share. 
We hope that it will be distinctly understood that throughout 
the work, where there is no special indieation to the contrary, 
our characters have been drawn up from the actual examination 
of specimens ; and for some further details as to the plan of the 
work, we would refer to my Report read in Section Biology of the 
meeting of tbe British Association at Belfast in 1874. 
On the Synonymy of the Orchidaceous Genus Didymoplevis, 
Griffith, and the Elongation of the Pedicels of D. pallens 
after Flowering. By W. Borrrya Hxwsrbt, A.L.S. 
[Read February 15, 1883.] 
(Puate XXVIII.) 
Iv 1844 William Griffith published* a detailed description of an 
orchid, found near Serampore, in Lower Bengal, which he re- 
garded as the type of a new genus, and named Didymoplezis pal- 
lens. A few years later Blumet published his genus Leucorchis, 
describing one species, L. sylvatica, a native of Java. In 1851 
Wight figured f and described an orchid, collected in Coorg by 
Jerdon, under the name of Apetalon minutum. The same year 
M*Clelland$ published Griffith's plant under his original manu- 
script name of Arethusa ecristata. 
Whether these three plants represent only one species is 
perhaps not quite certain; but there is no doubt about their 
belonging to the same genus. Lindley, in a manuseript note in 
his herbarium, suggests that Leucorchis of Blume is the same 
* Caleutta Journal of Natural History, iv. p. 383, t. 17. 
t ‘Museum Botanicum Lugduno-Batavum,’ i. p. 31 (1849), and * Les Orchi- 
dées de l'Archipel Indien,’ p. 146, eum ic. 
1 ‘Icones Plantarum Indis Orientalis, v. t. 1758. 
* $ Posthumous papers of W. Griffith, “ Notule ad Plantas Asiaticas,” iii. 
p. 378, and ** Icones Plantarum Asiaticaruin,” tt. 343 & 344. 
