64 



The leaves are succulent, brittle, and veinless when 

 fresh. 



69. D. undulatum (R. Brown, Prodr. SS^. L. no. 62. D. dis- 

 color, Lindl. in Bot. Reg, 1841. t. 52) ; foliis ovato- 

 oblongis emarginatis, racemis longissimis, sepalis peta- 

 lisque undulatis, labelli trilobi lobis acutis intermedio 

 lanceolate, lineis quinque elevatis intermedia apice 

 fluxuosa. — — Java^ Tropical New Holland. — — A species 

 with singular dingy yellow-brown flowers, of little beauty. 



70? D. affinc (Omjchium affine, Decaisne herb, timor. 37); 

 foliis lineari-oblongis acutiusculis coriaceis, pedunculo 

 foliis triplo longiore oppositifolio ? laxifloro, floribus 

 spicatis; perianthioerecto, segmentis exterioribus lineari- 

 lanceolatis acutis, interioribus subobovatis rotundatis 

 mucronulatis ; labelli unguiculati lobis 3, medio lineari- 



lanceolato, lateralibus subrotundis. Timor. Since 



M. Decaisne compares this with D. Mirbelianum, it pro- 

 bably belongs to the present section. The petals are 

 said to be obovate and mucronate. 



Next after these species must be placed those plants which 

 Dr.. Blume calls Pedilonum, of which one species only is 

 known to me. In that I long since (Bot. Reg. 1839, misc. 

 169) stated that the structure is of the following singular 

 nature : — In the first place the lateral sepals and the base of 

 the lip are so united into a spur, that their separate nature is 

 entirely concealed towards the point of the spur. In the next 

 place the rostellum is a deep two-lobed lip curved down over 

 the stigmatic surface. The pollen-masses are in two pairs, 

 and deep purple ; and, which is extremely curious, they lie 

 upon a loose hard transverse crustaceous gland, which seems 

 to replace the gland and caudicula of Vandese, and which 

 projects beyond the anterior edge of the anther, resting upon 

 the two-lobed rostellum. The anther-bed itself is deeply 

 excavated, and three-lobed, the anther adhering to the back 

 lobe which is the narrowest. 



Should these characters, all or any of them, prove common 

 to the plants now collected into this section, there will be no 

 doubt about their forming a perfectly distinct genus. In the 

 mean while I would not extend its definition beyond that of 

 Dr. Blume. 



