67 



ultraunciali [| vel 1|], sepalis purpiireis oblongis apice viridi seepius 

 tomeuto^'s, pctalis longioribus spatluilatis viridibua punctatis, germine 

 pubescente vel pubc obsolescente vol obsoleta. Var. 1, Simplex. B. sim- 

 plex, he>'h. Amur, pedunculis simplicibus. Var. 2. Pubescens; perian- 

 thio -|- unc. sepalis confertim tomentosis, ped. 1-2-floris. Var. 3. Sub- 

 pubescens; periauthio \\ unc. sepalorum et germinis pube rara, pedunc. 

 1-3-fions. Var. 4. Subglabra ; sepalorum et germinis pube fere vel 

 omnino obsoleta, periantbio 1|^ unc. ped. 1-3-floris. Var. 5. Albescens; 

 (apud me, puto, fortuita ex var. subglabra) caule et foliis pallidioribus 

 et germine glabro, sepalis albis glabris apice viridi, petalis costa lutes- 

 cente viridibus non punctatis. Species Peruviana et Boliviana in Audi- 

 bus passim ; in cultis eadem planta vel umbella quandoque involucri 

 bracteai rainutre vel foliiformes et sesquiunciam latas, peduuculi simplices 

 vel furcati, rariiis triflori. Cceli nostri patiens foliis, hieme superinjectis, 

 restate tota et autumno caulibus successivis floret. W. H. 



91. BOMAREA acutifolia. 



B. acutifolia ; Var. 3. Coccinea, periantbio coccineo, petalis luteo marginatis 

 intus punctatis. Ex ditione Meocicand. W. H. 



PLEUROTHALLIS. 



; This genus is one of those large assemblages of species, 

 which has been so much increased by modern discoveries as 

 no longer to resemble what it was only ten years ago. Of the 

 numerous kinds defined since the publication of the Genera 

 and Species of Orchidaceous Plants in 1830, the greater part 

 have been made known in a desultory manner, so that a 

 Botanist finds it difficult to compare them with each other. 

 They have moreover been insufficiently classified, in conse- 

 quence of which the difficulty of their determination has been 

 much increased. It therefore seems to me that a complete 

 recapitulation of all that are known up to the present time 

 cannot be otherwise than useful ; the more especially as their 

 smallness, and the minuteness of the characters by which 

 they are known, are sufficiently embarrassing even when the 

 exposition of the species is as clear and well arranged as art 

 can make it. Let me be permitted, however, before going 

 into an enumeration of the species of this genus, to oifer a 

 few general observations on the genera allied to it. 



Among Malaxeous Orchidacese, Pleurothallis undoubtedly 

 forms the type of a very natural group ; which, however, in the 

 Genera and Species of Orchidaceous Plants is not sufficiently 

 K— October, 1842. u 



