The Guiana Orchids. 291 



10. O. Baueri ... Similar to the last, differing in the column 



J I. O. lunatum ... With bulbs, flower-stems rising a little 



beyond the leaves, flowers yellow, orange 

 spotted. 



12. O. Pirarense 



13. O, nigratum ... With bulbs, flowers crimson, brown 



spotted. 



14. O. orthostates. ... With bulbs ; flowers green, brown spotted. 



29. Brassia. —Handsome plants with pseudo-bulbs, 

 and flowers in spikes, generally yellow, with brown dots. 

 The two lower floral divisions (petals), are always longer 

 than the upper, sometimes very long and tail-like. The 

 two ranks of flowers on arching stalks, highly perfumed, 

 make the Brassias very desirable, especially as they 

 flower freely. Six species : — 



1. B. cochleata ... Lip broader than long, petals equal with 



the lip. 



2. B. Lanceana ... Lip oblong, wavy, shorter than the petals. 



3. B, Lawrenciana ... Similar to the last, hardly more than a 



larger and finer variety. 



4. B. caudata ... Lip ovate, petals very iong. 



5. B. verrucosa ... Lip oblong, curled, covered with shining 



warts. 



6. B. odontoglossoides 



30. Trizeuxis. — A single species, without pseudo- 

 bulbs, with narrow sword-shaped leaves and insignifi- 

 cant clustered flowers : — 



I. T. falcata ... Flowers greenish. 



31. Trigonidium. — Rather peculiar looking plants for 

 orchids as the flowers are almost regular, the outer 

 divisions enclosing the lip and petals, making the flower 

 appear something like a crocus, which resemblance is 

 increased by each being borne on a stalk by itself. All 

 the species have pseudo-bulbs and yellow flowers. Four 

 species : — 



