The Guiana Orchids. 



275 



0. p. orbicularis 



1. P. multicaulis 



2. P. succosa 



3. P. crassifolia 



4. P. sertularioides 



5. P. stenopetala 



6. P. rhombipetala 



7. P. Miqueliana 



8. P. Surinamensis 



9. P. acuminata 



20. P. biflora 



21. P. brevipes 



Flowers purple. 



Flowers yellowish green. 

 Flowers whitish, with yellow tips. 

 Flowers brownish yellow. 



Flowers dark purple, 

 Flowers yellow. 

 Flowers dull yellow^ 

 Flowers purple. 

 Flowers brownish purple. 



2. Stelis. — This genus is similar in habit to the pre- 

 ceding, but the plants are somewhat larger, and whereas 

 the floral divisions in Pleurothallis are generally pointed 

 and more or less connivant, in this they are rounded and 

 the whole flower almost flat. They are exceedingly 

 pretty little plants and S. grandiflora is a lovely gem. 

 Eight species : — 



Flowers greenish, tinged with purple. 

 Flowers green and purple. 

 , Flowers white and red. 

 Flowers yellow, zoned with mauve. 

 Flowers greenish purple. 

 Flowers dull yellow. 

 Flowers dull yellow. 

 Flowers green. 



3. Masdevallia. — A genus containing some very beau- 

 tiful plants and also others little more showy than 

 some species of Pleurothallis, which they much resemble 

 in habit as well as in the shape of the flowers, these being 

 however larger, fewer on a stalk and the divisions often 

 tapering to long points. Three species : — 



1. M. Guyannensis 



2. M. brevis ... Flowers yellowish brown with purple spots 



3. M, pifturata 



1. S. ophioglossoides 



2. S. argentata 



3. S. grandiflora 



4. S. zonata 



5. S. Heylidyana 

 6 S. ovalifolia 



7. S. flavida 



8. S. tristyla 



