It is not improbable that, besides these, Max'illaria 

 tetragona, and a few others, may require to be furtlier 

 separated. 



Having- thus explained my notions of the manner in which 

 Maxillaria and the genera allied to it may be best systema- 

 tised, I proceed to add very brief characters of the new genera 

 and their species. 



Promen.ea. Sepala patula. Labellum trilobum, medio cris- 

 tatum V. multo-tuberculatum. Columna brevis, semiteres. 

 Glandula ovata. Pollinia 4, geminata, sessilia. 



1. P. stapelioides {M&xiW.. stapelioides, L. 146. B. R. 1839. t. 17.); pseudo- 



bulbisovatis tetragonis 1-2-phyllis, foliis tenuibus lanceolatis patentibus 

 pallide glaucis reticulatis, peduuculo diffuso bifloro, scpalis petalisque 

 subrotundo-ovatis acutis patulis suba^qualibus, labello oblongo tiilobo : 

 laciniis lateralibus erectis linearibus obliquis obtusis intermedia, ovato- 

 oblonga basi cucullata, crista transversa flexuosa carnosa. intiis dente 



carnoso ovato aucta. Bi-azil. Flowers green externally, yellowish 



internally, speckled and banded with purple. 



2. P. xanthina (Maxill. xanthina, Lindl. Bot. Reg. 1839. sub t. ITO; pseu- 



dobulbis ovalibus tetragonis 1-2-phyllis, foliis anguste lanceolatis, pe- 

 dunculis ascendentibus unifloris pedicello sterili terminatis, bractea ovata 

 mucronata cucullata, sepalis petalisque oblongis acutis patulis subaequa- 

 libus, labello oblongo trilobo laciniis lateralibus erectis linearibus obtu- 

 sissimis integris intermedia bilabiata: labio superiore carnoso abbreviate 

 truncato 5-dentato inferiore oblongo acuto. — Brazil. — Flowers yellow. 



3. P. lentiginosa (MaxilL lentiginosa, Lindl. hi Bot. Reg. 1839, misc. 93.) ; 



bracteis lat^ ovatis acuminatis, labeUi lobo medio ovato-oblongo obtuso, 

 crista transversa medio processu quadrato tridentato aucta, antherae 



apice incurvo ; alioquin M. stapelioidi maxWs,. Brazil. Very like 



P. stapelioides ; but the sepals are more acute, the purple spots redder, 

 more distinct, and less run into bars ; the lip is of the same colour 

 as the petals, and its transverse crest has a square three-toothed process 

 in the middle. 



4. P. Rollissonii (Maxill. Rollissonii, Bot. Reg. sub/ol.\986.et 1838, ^.40.); 



pseudobulbis subrotundis compressis bifoliis, foliis lanceolatis apice re- 

 curvis, scapis subunifloris diffusis laxfe vaginatis, sepalis carinatis latera- 

 libus basi subsequalibus petalisque acutissimis, labeUi lobis lateralibus 

 ovatis angustis acutis intermedio oblongo membranaceo apiculato mar- 

 gine deflexo ; callo disci elevato carnoso antice transverso lobos laterales 

 labelli conjungente medio producto truncato tridentato et denticulis re- 

 flexis postic^ fornicato truncato bilobo. Brazil. Flowers pale yel- 

 low, with purple spots on the lip. 



5. V.graminea (Maxill. graminea, Bot. Reg. sub fol. 1802.); pseudobidbis 



nuUis, fohis gramineis recurvis, perianthio campanulato, sepalis oblongis 

 obtusis laterahbus paululum connatis, petalis angustioribus, labello cum 

 pede longe producto columnse articulato trilobo : lobis lateralibus semi- 

 ovatis acutis ascendentibus intermedio majore reniformi, tubcrcnlo disci 



magno carnoso truncato postice bilobo. Guayana; Brazil, in theprov. 



of Bahia. Flowers pale yellow, banded with dull purple. 



