Thouars's figure that the same thing happens to the large con- 

 volute bracts. This unusual singularity has suggested the 

 name Pesomeria (7ri7TTco, I fall off, and ixepos a part of any 

 thing); of which the following is a character and description. 



PESOMERIA. ' 



Nat. ord. Orchidace^e, § Epidendre^e. 



Sepala subfequalia, libera, sponte decidua. Petala conformia, basi columnar 

 adnata, persistentia. Labellum posticum, cum columna connatum, basi 

 gibbosum, limbo indiviso convoluto. Columna clavata, semiteres, clinan- 



drio dentato. Pollinia 4, cuneata. Herba terrestris ; caule tetra- 



gono ; foliis membranaceis plicatis ; racemo laterali simplici, bracteis 

 sponte secedentibus ; radicibus crassis, simplicibus , fibrosis . 



1 . P. tetragona. 



Epidendrum tetragonum. Thouars Orch. Afr. tt. 33. 34. 



Sepala carnosa, patula, oblonga, carinatoacuminata, luteo-viridia, intus fusca, 

 lineis intensioribus, omnino libera, aequalia, sponte decidua ! fere pollicem 

 longa, 3 lineas lata. Petala aliquoties breviora et angustiora, obovata, acu- 

 tissima, intus luteo-fusca, cum columna parallela ejusque basi utrinque ad- 

 nata, haud decidua. Labellum posticum, convolutum, carnosum, cum co- 

 lumna semiconnatum, ima basi gibbosum, cuniculo intus pubescente ; lamina 

 obscure lutea, venis divergentibus fusco-purpureis, latiore quam longa, apice 

 cuspidata et crispa, intus sparse villosa, linea media elevata. lata carnosa 

 sursum sulcata. Columna clavata, semiteres, clinandrio dentato. Stigma 

 lunatum : rostello plicato ? Anthera obtuse conica, pilis albis erectis 

 villosa, apice membranacea, bidentata, suberosa, obsolete 8-locularis. Pol- 

 linia 4, cuneata, cereacea, materie pulverulenta elastica coha?rentia (ulte- 

 rius indaganda). 



7. EPIDENDRUM Boothlanum. 



E. Boothianum ; pseudo-bulbis ovatis subdiphyllis, foliis ligulato-oblongis un- 

 dulatis apice subobliquis, racemo terminali laxo sub-7-floro basi spathaceo 

 foliis longiore, sepalis petalisque subsequalibus patulis ovali-llnearibus acucis 

 fusco-variegatis, labello semilibero rhomboideo acuto utrinque deflexo. 



I have had an account of this pretty species of Epiden- 

 drum in my possession for nearly two years, without being- 

 able to satisfy myself about its being certainly new, so many 

 are the species of this extensive genus. Upon a recent 

 examination of the evidence it does appear distinct, and 

 therefore it is named in compliment to Air. W. B. Booth, 

 one of the most intelligent gardeners in this country, 

 to whom I am obliged for a drawing and the following de- 

 scription of it ; Sir Charles Lemon has supplied me with 

 some excellent specimens. 



