290 



TiMEHRI, 



have pseudo-bulbs, from below which rise the flower- 

 spikes. Two species : — 



1. O. citrosmum ... Flowers waxy-white with a rosy lip. 



2. O. epidendroides ... Flowers yellow, dotted with purple. 



28. Oncidium. — A large genus containing some very 

 fine plants, chara6lerised by having a little pile of 

 excrescences on the base of the lip. The species vary in 

 size from an inch or two high (O. iridifolium) to as much 

 as ten or twelve feet (O. altissimum). Some are pro- 

 vided with monster pseudo-bulbs, while others are des- 

 titute of these and have thick leathery leaves. The flowers 

 are generally of some shade of yellow with crimson 

 markings and are borne on spikes or panicles. Fourteen 

 species : — 



1. O. Lanceanum ... Without bulbs, leaves leathery, flowers 



pale yellow blotched and barred with 

 chocolate, lip violet. 



2. O. luridum ... Similar to the last but flowers smaller 



borne on longer flower-stems and dull 

 in colour. 



3. O. sanguineum ... Without bulbs, flowers-stems very long, 



flowers straw colour and crimson. 



4. O. tetrapetalum ... Without bulbs, flower yellow, spotted 



with brown. 



5. O. variegatum ... Without bulbs, flowers white, spotted 



with rose. 



6. O. pulchellum ... Without bulbs, leaves awNshaped trian- 



gular, flowers pale rose, with crimson 

 markings. 



7. O. nanum ... Without bulbs, leaves oval, concave, 



flowers white. 



8. O. iridifolium ... Very small, without bulbs, leaves spread- 



ing like a fan, flowers yellow. 



9. O. altissimum ... Pseudo-bulbs large, flower-stems 8 to 12 



feet high, flowers yellow, orange 

 spotted. 



