330 Sir W. J. Hooker on two new Orchideous Plants. 



liatis uninervibus, labello trilobo, lobo medio elliptico pubescenti-velu- 

 tino. (Plate XV.) 

 Hah. British Guiana. 



Cultivated in the stove of C. S. Parker, Esq., of Liverpool, 

 having been received with many other rarities from Deme- 

 rara. Whole plant scarcely 3 inches high. Leaves 3, in our 

 specimen spathulate, acute, an inch or an inch and a half 

 long, including the slender petiole into which it gradually 

 tapers. Scape very slender, twice as long as the leaves, bear- 

 ing a raceme of 3 — 4 flowers half an inch long. Perianth 

 erect. Sepals equal, lanceolate, 3-nerved, concave, dingy 

 yellow, spotted with purple, much acuminated, so as to be al- 

 most aristate at the extremity, the two lateral ones united at 

 their base. Petals about one third the length, and about one 

 third the breadth of the sepals, oblong, 1 -nerved, acuminate, 

 almost aristate, and strongly ciliated at the margin. Lip as 

 long as the petals, fleshy, contracted a little above the base, 

 narrow, oblong, 3-lobed, the side lobes obtuse, incurved, the 

 middle one elliptical, clothed on the upper side with velvety 

 down. Column wingless, slender, shorter than the petals. 

 Anther conical, oblique. 



The two lateral sepals are but slightly combined, and 

 though not serrate they are concave below, so that this plant 

 seems almost to combine the characters of Specklinia with 

 Pleurothallis. 



Plate XV. A. Pleurothallis aristala, nat. size. Fig. 1, flower; fig. 2, 

 the same laid open ; fig. 3, petal; fig. 4, labellum ; fig. 5, column and an- 

 ther, magnified. 



2. Stelis foliosa. 



Nana, foliis subtribus lineari-oblongis, scapo foliis breviore, spica sub- 

 compacta, floribns subcernuis, petalis lingulatis sepala subaaquantibus, 

 labello trilobo, medio dense glanduloso. (Plate XVIJ.) 



Hah. British Guiana ; whence it was introduced in a living state by C. 

 S. Parker, Esq. 



Root small, fibrous. Leaves 3 — 4, of which 2 are nearly 

 equal in length, 2 — 3 inches long, linear oblong, rather waved, 

 below there are one or two smaller ones. Scape shorter 

 than the foliage, bearing a short and rather compact spike 

 of 12 — 14 flowers, throughout of this same uniform pale 

 greenish colour, slightly drooping, each subtended by a small 



