12 LINDLEY ON PERUVIAN ORCHIDES. 
but is not half the size, and wants the ciliated vagine of that 
species. The leaves are not more than halfan inch long, and the 
length of the tallest racemes does not much exceed an inch 
and a half; they are often much shorter. This is the smallest 
species, except S. pusilla. 
1. Stelis Zallii; foliis lineari-oblongis obtusis basi valde 
angustatis racemis filiformibus multifloris duplo brevioribus, 
bracteis infundibularibus, limbo obliquo acuto subcordato, 
sepalis ovatis acutis concavis, postico complete trivenio duplo 
majore, sepalis subrotundo-ovatis labelloque cuneato truncato 
carnosissimis.— Trunks of trees at Turuencho near Cuenga, 
Colonel Hall. 
8. DIOTHONEA.* 
Sepala conniventia, distincta; lateralibus paulo longioribus. 
Petala sepalo supremo concavo conformia et subzequalis. 
Labellum cum cyatho e lateribus dilatatis membranaceis 
columnz formato articulatum, obsolete lobatum, basi bila- 
mellatum, sepalis lateralibus multo longius, dependens. 
Columna erecta, clinandrio cucullato antheram obsolete 4- 
locularem semitegente. Pollinia 4, solida, pyriformia, 
apice materie pulverea cohzerentia.— Herba epiphyta, ra- 
mosa, ebulbis. Racemi axillares, multiflori, foliorum lon- 
gitudine. Flores majusculi. 
D. L loensis.—Valley of Lloa, western declivity of the 
Andes, Colonel Hail. 
Caulis ramosus, compressus, vaginis persistentibus foliorum 
squamatus, pedalis v. ultra. Folia lineari-lanceolata, stri- 
ata, margine revoluta, apice paululum obliqua, et subcar- 
tilaginea. Racemi 2 poll. longi, 9-flori. Bractee subu- 
latze, scariosz, reflexee. Flores membranacei, verosimili- 
ter flavescentes. ZLabellum subrotundum, concavum, obso- 
lete 4-lobum. 
This distinct genus is remarkable for a wide, compressed 
^ * From ev, a sail, in allusion to the two membranes stretched from the 
column to the lip, like jibs from the foremast to the bowsprit of a ship. 
