60 



DENDROBIUM Ruckeri. 

 Mr. R.uckcr's Dendrohium. 



GYNANDRIA MONANDRIA. 



Nat. ord. Orchidace^. § Malaxed — Dendrobid.e. 

 DENDROBIUM. Supra, vol. 15. fol. 1291. 



Sect. EuDENDROBiUM. Caiile tei'eti, foliis plants, floribiis gemellis, labello 



trilobo. 



D. Ruckeri (Liudl. in Bot. Reg. 1843. misc. 38.) ; caulibus teretibus, foliis 

 ovato-lanceolatis acuminatis planis, floribus gemellis, sepalis patulis ob- 

 tusiusculis convexis margine reflexis lateralibus subtriangularibus, labelli 

 trilobi lobis rotundatis intermedio undulato axi elevata villosa. 



We presume this plant to be one of Mr. Cuming's discove- 

 ries in the Philippines, although no trace of it is to be found 

 among his dried specimens. 



It belongs to the same set as D. Pierardi, among which 

 it is one of those with yellow flowers, the others being 

 D. sanguinolentum, chrysanthum, Cambridgeaniim, rugosum, 

 salaccense, Paxtoni, and aureum. Although it may not be 

 quite so handsome as some of these, yet it is a very fine 

 species, and perfectly distinct, both in colour, habit, and the 

 structure of the flowers. 



Its leaves are exactly lanceolate, very sharp-pointed, and 

 a little disposed to curve backward at the end. The flowers, 

 although of a rich yellow nankin colour when expanded, are 

 almost white externally ; their lower sepals, which are really 

 ovate in form, are rolled back at the edge, near the middle, 

 so as to look as if contracted there. The petals and upper 

 sepal are nearly of the same size and form, linearly obovate, 

 acute and spreading. The labellum is deep orange, with a 

 white edge and a pale pink outside ; when spread flat it is 

 roundish obovate, with three rounded lobes, of which the 



