Tas. 8610. 
ZYGOPETALUM PrarInianum. 
Peru, 
ORCHIDACEAE. Tribe VANDEAE. 
ZYGOPETALUM, Hook. ; Benth. et Hook. f. Gen. Plant. vol. iii. p. 542, 
Zygopetalum Prainianum, Rolfe in Kew Bulletin, 1914, p. 876; Gard. 
Chron. 1914, vol. lvi. p. 195; Orch. Rev. 1914, p. 317; affinis Z. Burkei, 
Reichb. f., sed pseudobulbis longioribus, foliis latioribus, et colore florum 
differt. ea 
Herba terrestris. Psewdobulbi anguste oblongi, basi paullo incrassati, sulcati, 
3-10 cm. longi, apice 2-3-phylli. Folia elongato-lanceolata vel elongato- 
oblonga, subacuta, 25-35 cm. longa, 1°5-8 cm. lata, subcoriacea. Scapi 
erecti, circiter 60 cm. longi, basi vaginis spathaceis obtecti, 4—-5-flori; 
bracteae ovato-oblongae, subacutae, conduplicato-concavae, 1°5-2-cm, 
longae; pedicelli 3-4 cm. longi. Flores speciosi. Sepala et petala 
patentia vel subreflexa, lanceolato-oblonga, subacuta, subcarnosa, circiter 
2°5 cm. longa, 1 em. lata. Labellwm subpatens, pandurato-oblongum, 
subacutum, 2 cm. longum, 1°5 cm. latum, prope apicem subincurvum et 
crenulatum, basi callo crasso dentato instructum. Colwmna clavata, 
incurva, 1°5 cm. longa; alae triangulari-oblongae, subincurvae, 4 mm. 
longae. Pollinia 4, obovoidea, subcompressa; stipes squamiformis, 
glandula cordata.—R. A. Roure. 
The very interesting Zygopetalum which is the subject 
of our plate is one of the Peruvian discoveries of 
Mr. L. Forget when collecting in South America on 
behalf of Messrs. F. Sander and Sons. The plant flowered 
for the first time in their collection at St. Albans in 
September, 1914, and was then purchased from them for 
Kew. Its nearest ally appears to be Z. Burkei, Reichb. f., 
a native of Mount Roraima in British Guiana, the two 
species being extremely like each other as regards the 
shape of the labellum. They are, however, readily 
distinguished by their pseudobulbs and leaves which 
are considerably larger in the Peruvian than in the 
Guiana plant. They also differ as regards the colour of 
their- flowers, there being fewer green markings on the 
petals of the species here described. The treatment 
suitable for the stronger species of Zygopetalum, such as 
Z. crinitum or Z. intermedium, is found to be well 
adapted to the needs of Z. Prainianum also. 
May, 1915. 
