76 THE BOOK OF ORCHIDS 



glass as is possible ; for, if far away from the glass, the 

 stems become drawn and the flower spikes weak. 

 Water the plants all through the growing season as 

 advised for Calanthes. While at rest, an occasional 

 sprinkle on the surface of the soil will assist to keep 

 the tubers plump. 



Houlletia 



A genus allied to Stanhopea, and requiring similar 

 culture, except that its members may be grown in a 

 trifle lower temperature. Houlletias are natives of 

 Northern Columbia and Southern Brazil. The genus is 

 represented by such well-known species as H. Brockle- 

 hurstiana, H. chrysantha, and H. odoratissima. 



Ionopsis 



A genus of dwarf-tufted epiphytes, widely dispersed 

 over tropical America. The best known are 1. paniculata 

 and 7. utricularioides. The plants should be placed in 

 small perforated pans, using a compost of peat and 

 moss, hung near the glass in the intermediate house, 

 and be freely supplied with water. 



Ipsea 



I. speclosa is a terrestrial, deciduous Orchid, with 

 tuberous rhizomes. It grows on the mountains in 

 Ceylon, amongst long grass on exposed slopes, at an 

 elevation of about 4000 to 5000 feet. The erect flower 

 scapes are about eighteen inches high, bearing several 

 large bright yellow fragrant blossoms. The cultural 

 treatment of Ipsea speciosa is the same as that of the 

 Pleiones, but it requires a much higher temperature. 



