17 
15. PONERA graminifolia, (Nemaconia graminifolia, Knowles and Westcott, 
Floral Cabinet, p. 127); folis lineari-lanceolatis planis, labello oblongo 
acuto apice recurvo. : 
In the Genera and Species of' Orchidaceous plants, p. 113, 
a genus was established under the name of Ponera, (from 
rrovnpos, miserable, vile, alluding to the wretched appearance 
of the species) from a Mexican plant in the herbarium of 
Mr. Lambert. As I had originally no opportunity of criti- 
cally examining the structure of the plant, further than was 
afforded by the dissection of a single dried flower, its cha- 
racter was not very complete; and I presume the trifling 
differences which exist between this species and the descrip- 
tion in the above work, are owing to imperfect observations 
in the latter case. They have however led Messrs. Knowles 
and Westcott to suppose that this plant forms a new genus, 
an error which | hasten to correct. Having received flowers 
of it from Mr. Barker, I find that it agrees in every essential 
particular with the structure of P. juncifolia; so nearly 
indeed that, if the leaves of the two were not very different, 
some doubt might be entertained of their being specifically 
different. P. graminifolia is a plant of no beauty, and ;1s 
chiefly remarkable for having the scabrous stems, which are 
so conspicuous in the elegant Arpophyllum spicatum from the 
same country. 
16. ARPOPHYLLUM spicatum, La Llave. 
One of the most graceful and beautiful of the Mexican 
Orchidaceze; it has recently reached England in a living state. 
The stem is slender, and a foot or foot and half high, with 
the sheaths as rough as shagreen leather ; it is terminated 
by one long curved leaf, from the axil of which there curves, 
in an opposite direction, a dense spike of pink or palo papie 
flowers. It is a species of great rarity even in Mexico, 
where it has hitherto been only seen at Sultepec and near 
Arimbaro, growing upon trees. The genus belongs to Epi- 
dendrez, near Ponera, and not to Vandez. 
HORTICULTURAL SOCIETY'S GARDEN. 
All who are interested in the cultivation of exotic plants, 
will be glad to learn that the Horticultural Society of London 
are about to erect a most extensive conservatory in their 
garden at Chiswick. The range will be nearly 500 feet 
