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-off 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. Beg. t. 3966. 

 M. acutipetala; pseudo-bulbis oblongo-ovatis angulatis dipbyllis, foliis lato- 

 lineanbus acutis, scapis radicalibus uni-bifloris, sepalis petalisque ob- 

 longis acutis patentibus subconformibus, labello oblongo trilobo centro 

 stnato basique lineis*elevatis subquinque. lobis lateralibus brevibus co- 

 lumnam myolventibus intermedio acuto reflexo. Hooker, I. 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. 



