ORCHIDS OF MADAGASCAR. 121 



breve clavatum saccatum obtnsunj, ovario multo brevius; columna 

 brevis; autliora subcoiiieaj aplce obscura. 



Central Madagascar, Baron no. 3423, 



A stragii;ling plant with long narrow leaves and a lax tbin 

 panicle of small flowers*. It seems to be most nearly allied to 

 the West-African E. lurida^ Lindl. 



PoLYSTAcnTA FFSiFORMis, Lindl, — Dendrobium fusiforme, 

 Thouars, Angavokely, near Ambatovory, Dr. Fox, no. 39. To 

 this species must be referred, I fear, my P. minutiflora, I was 

 misled by a couple of flowers in the British-Museum Herbarium 

 received from Du Petit Thouars as those of P.yw5^/br«^^>, but 

 which seem rather to belong to P. cultrata^ Lindl. 



PoLTSTAcnA ROSEA, Midi., witli flowers both purple and white, 

 was obtained at Ambatovory by Dr. Pox. 



AERANTHrs poLTANTHEMUS, D. sp. — Eadiccs lati crassiusculi ; 

 caulis biuncialis ; folia angusta ligulata obtusa vis biloba striata, 

 circiter 7 uneias louga | uucise lata ; racemi graciles e basi caulis 

 orti penduli 5-unciales, 9-flori ; flores laxi mediocres virides- 

 centes inexpansi ; bractese lanceolatse dimidio ovarii brevis sub- 

 foqualcs ; sepala lanceolata acuminata, lateralia basi angulata ; 

 petala subsimilia sequalia, basi dilatata vix angulata, |-uncialia; 

 labellum basi concavum, marginibus brevissime lobulatis, medio 

 perforato, lamina lanceolata subacuminata multinervia basi an- 

 gustata ; columna brevissima semiteres, rostellum breve, stigma 

 semilunare; calcar breve crassiusculum obtusum incurvum. 



Ambatovory, Imerina, no. 32. Plowers nearly transparent, 

 greenish yellow. — Dr. Fox. 



This species, a true Aer ant 7i us ^ differs from^. grandifiorus and 

 A, Arachnites in its closer raceme of many small green flowers. 

 The lip is adnate to the base of the column and its base forms a 



A 



somewhat deep depression, on each edge of which is a short blunt 

 lobe. Just before the lip expands into its thin lanceolate pointed 

 lamina, the basal depression is perforated by the entrance to the 

 short blunt incurved spur. The blade of the lip is thrown up so 

 as to be approximately parallel to the petals, and forms an angle 

 with the pedicel. The lateral sepals have an abrupt angle, almost 

 a lobe at the base. 



Angrcecum pahniferiun^ Thouars, is, I suspect, a near ally of 



