13 
It is not improbable that, besides these, Maxillaria 
tetragona , and a few others, may require to be further 
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 (Maxill. stapelioides, L. 146. B. R. 1839. t. 1 70; pseudo- 
bulbis ovatis tetragonis 1-2-pbyllis, foliis tenuibus lanceolatis patentibus 
pallide glaucis reticulatis, pedunculo dilFuso bifloro, sepalis petalisque 
subrotundo-ovatis acutis patulis subeequalibus, labello oblongo trilobo : 
laciniis lateralibus erectis linearibus obliquis obtusis intermedia ovato- 
oblonga basi cucullata, crista transversa flexuosa carnosa inths dente 
carnoso oyato aucta. Brazil. Flowers green externally, yellowish 
internally, speckled and banded with purple. 
2. P. xanthina (Maxill. xanthina, Lindl. Bot. Reg. 1839. sub t. 1/.); 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 subeequa- 
libus, labello oblongo trilobo laciniis lateralibus erectis linearibus obtu- 
sissimis integris intermedia bilabiata: labio superiore carnoso abbreviato 
truncato 5-dentato inferiore oblongo acuto. — Brazil. — Flowers yellow. 
3. P. lentiginosa (Maxill. lentiginosa, Lindl. in Bot. Reg. 1839, misc. 93.) ; 
bracteis latk ovatis acuminatis, labelli lobo medio ovato-oblongo obtuso, 
crista transversa medio processu quadrato tridentato aucta, antherse 
apice incurvo ; alioquin M. stapelioidi similis. 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 fol. 1986. et 1 838, t. 40.) ; 
pseudobulbis subrotundis compressis bifoliis, foliis lanceolatis apice re- 
curvis, scapis subunifloris diflusis lax& vaginatis, sepalis carinatis latera- 
libus basi subsequalibus petalisque acutissimis, labelli 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. P .graminea (Maxill. graminea, Bot. Reg. sub fol. 1802.); pseudobulbis 
nullis, foliis gramineis recurvis, perianthio campanulato, sepalis oblongis 
obtusis lateralibus paululum connatis, petalis angustioribus, labello cum 
pede longe producto columnse articulato trilobo : lobis lateralibus semi- 
ovatis acutis ascendentibus intermedio majore reniformi, tuberculo disci 
magno carnoso truncato postice bilobo. — Guay ana ; Brazil, in theprov . 
of Bahia. Flowers pale yellow, banded with dull purple. 
