1923 



* TRIGONIDIUM obtiisum. 



Bhuit-pctuUed Trigonidium. 



GYNANDRIA UONANDHIA. 

 Nat. Old. ORCHIDACEa;, § VAiNDE*. 



TRIGONIDIUM. Sepala squalia, semiherbacea, in cyathuiii triguimin 



•isoscelem coliaerentia, apice patula. Petala corollina, duplo minora, venosa. 



Labellum nanum, trilobuni, cum columna articulatum, medio carnosum. Co- 



lumna nana, libera, semiteres. Anthera unilocularis. Pollinia 4, coha^rentia, 



ininoribus dorsalibus, in glandulam triangularem stigma parvum triangulare tegen- 



tem insidentia. Herba; epiphijttB, Americana, rhizomate repente Jiorifero ! 



et pseudobulbifero. Folia coriacea. Pedunculi erecti, uniflori, vaginati. 



T. obtusum ; foliis lineari-lanceolatis, vaginis acutis, sepalis obovatis, petalis 

 obtusis, labello dorso tuberculato, anthera glanduloso-pilosa. 

 Pseudobulbi compressi, oblongi, obsolete striati, in plantd spontaned 

 per duas uncias distantes, in rhizoma scapes plurimos promens insidentes. 

 Folia ctiique pseudobulbo duo, anguste lanceolata, pedalia, sesquiunciam 

 lata, fere enervia. Bateman in litt. Pedunculi palmares, erecti, foliis bre- 

 V ores ; vaginis 5, convolutis, acutis, pedmiculo appressis, superiore ovario 

 breviore. Sepala obovata, obtusa, basi quasi agglutinata in cyatlmm tri- 

 gonnm petalorum longitudine, luteo viridia, versus apicem fuscescentia. 

 Petala alba, apice aurantiaco-fusca et cullosa, venis purjmreis ornata. 

 Labellum petalis plus quam duplo brevius, trilobum, axi et lobo medio car- 

 nosis, infra apicetn extiis tuberculatum. Anthera glandulis piliformibus 

 cristata, l-locularis. 



For the opportunity of publishing this curious plant I am 

 indebted to Mr. Bateman, who sent it me in August 1836, 

 with the following note : — 



" This singular plant I owe to the exertions of Mr. CoUey 

 in Demerara. I received it from thence in the summer of 

 1834; the entire plant, at the time of its importation, con- 



* Named in allusion to the triangular form of several parts ; the sepals form 

 a 3-cornered cup, the gland on which the ])ollcii masses rest is an obtuse-angled 

 triangle ; and the stigma is a triangular excavation. 



