24 
round, grey, in adult trees thick. Buds somewhat swollen, 
abounding in balsam smelling like storax. 
Stipules obtuse, adpressed, balsamiferous. 
Petioles short, from one third to one-sixth the length of 
the blade of the leaf, flattish above with a very open furrow. 
Leaves spreading-erect, extremely variable in form ; ob- 
long, somewhat roundish-rhomboid, oval, ovate-elliptic, or 
ovate ; apex more or less acute ; base rounded, sometimes 
slightly and perfectly, at others broadly cordate ; leaves five- 
nerved, often seven-nerved, with the mid-rib dilated towards 
the setting-oif of the nervures above the base; closely and mi- 
nutely crenated, crenatures glandular, often double ; smooth, 
above opaque and green, beneath whitish green, not entirely 
void of brightness, reticulated. 
Leaves on suckers often lanceolate, sometimes tapering to 
each end, feather-nerved. 
N.B. The grey aspect of this species renders it impossible 
to mistake it ; besides which there is its strong odour of storax, 
especially in the spring. It inhabits the eastern part of Si- 
beria. I do not know whether the Balsam poplar of the 
Kamtchadales is this or some other species. A single twig 
collected by Langsdorff between Ochotsk and Irkutsch has 
larger leaves and more slender leaf-stalks than the Davurian 
plant. — Gartenzeitung , Dec. 18, 1841. 
36. MAXILLARIA acutipetala. 
Hooker in Bot. Reg. t. 3966. 
M. acutipetala ; pseudo-bulbis oblongo-ovatis angulatis dipbyllis, foliis lato- 
linearibus acutis, scapis radicalibus uni-bifloris, sepalis petalisque ob- 
longis acutis patentibus subconformibus, labello oblongo trilobo centro 
striato basique lineis elevatis subquinque, lobis lateralibus brevibus co- 
lumnam involventibus intermedio acuto reflexo. Hooker , l. c. 
According to Sir William Hooker this species, although 
allied on the one hand to M. tenuifolia and on the other to 
M. picta, is abundantly distinct from both. It was collected 
in Central America by Mr. Barclay, a gardener attached to 
the Sulphur surveying ship, and has flowered in the Botanic 
Garden, Kew. It is very near M. picta. The flowers are 
pale orange, spotted and blotched with blood colour. The 
petals are smaller, but of nearly the same shape and colour as 
the sepals. The lip is of a paler colour below, but coloured 
and spotted like the other parts. The column is deep red purple. 
