18 6 ORCHID ACE M. [ LIPARIS . 



Pehra Dun (Falconer, Mackinnon, Duthie). Flowers in. Sep. DISTRIB. : 

 Subtrop. Himalaya in Garhwal and Kumaon, up to 3,000 ft., and 

 eastwards to Sikkim, Bhutan and the Khasia Hills, also on the Nil- 

 giris and in Ceylon, extending to China and to the Malay and Pacific 

 Islands. A widely distributed and polymorphic species. The 

 Dehra Dun plant agrees best with Lind ley's L. spathulata, which has 

 shorter and thicker pseudobulbs, rather broader leaves and shorter 

 racemes than in the type. Hooker observes that it occurs frequently 

 in company with the form having long pseudobulbs, and that inter- 

 mediates abound. 



4. DENDROBIUM, Swartz ; Fl. Brit. Ind. v, 710. 



Epiphytic herbs. Pseudobulbs short and fleshy or elongate 

 and stem-like, usually tufted. Leaves usually sessile and with 

 slender bases, never plicate. Flowers solitary or in fascicles or 

 racemes, often large and showy. Sepals subequal, the lateral 

 pair obliquely adnate to the foot of the column and forming with it 

 a sac or mentum. Petals usually similar to the sepals. Lip sessile 

 or clawed at the base, adnate to and incumbent on the foot of the 

 column ; side-lobes embracing the column, or spreading, or absent ; 

 terminal lobe broad or narrow, flat convex concave or saccate, 

 the disk sometimes lamellate. Column short, with a long or short 

 foot and with usually a nectar-secreting cavity at its extremity, 

 the apex angled or 2-toothed. Anther 2-celled ; pollinia 4, equal 

 in length, usually all slightly coherent but sometimes in free pairs, 

 ovoid or oblong, slightly compressed, waxy. Species 700 or more, 

 in Temp, and Trop. regions of both hemispheres. 



Flowers small, not exceeding J in. across, dull- 

 yellow with stripes of red spots . . . 1. D. bicameratum. 

 Flowers about 1 J in. across or larger : 

 Basal portion of lip convolute : 



Apical portion of lip pale-yellow, basal 



portion white . . 2. D. primulinum. 



Lip pale-yellow with purple veins at the 



base 3. D. Pierardi. 



Lip convolute throughout its length, pale- 

 yellow with reddish-purple veins . . 4. D. Gamblei. 



