NATURAL ORDER ORCHIDACES. 
Tribe—OPurRYDEm. Section of genus Orchis, having united glands. 
Puate XVII.—Orchis longibracteata. Bivona. De Candolle. Woods. 
Aceras longibracteata. Grenier & Godron. Barlia longibracteata. 
Parlatore. Loroglossum longibracteatum. Ardono. 
GeveERIC.— Perianth ringent, hooded. Lip 3-lobed, spurred. Glands 
of the stalks of the Pollen-masses in a common pouch.—Babington’s 
Manual. 
Speciric.—Stigmatic chamber vertical, pear-shaped, unusually large 
and distinct. Pollen-masses having their stalks united in a common 
gland. Staminodia distinct. Lip divided into three lobes, the terminal 
lobe being notched, and the lateral ones wavy and of variable length ; 
colour very inconstant, but frequently purplish with dusky edges. . Spur 
very short. Petals lanceolate, enclosed by the hood-shaped upper sepal. 
Sepals veined, the two lateral ones spotted with pinkinside. Bracts 
longer than the flowers. Leaves very large, frequently ten and sometimes 
thirteen inches long, by from three to five inches broad. Twubers large 
undivided. 
EXPLANATION OF PLate XVII.—In this plate is drawn Orchis longi- 
bracteata, with the large insect (Xylocopa violacea) which sometimes . 
visits these flowers, and bears away their pollen-masses, Fig. 1, 
Pollen-masses adhering by their flat, viscid gland to a bit of culm of 
grass, and widely separated as they appear on first removal. Fig. 2, the 
same, but having been exposed about 14 minute to the air, the Pollen- 
masses approach one another, still remaining nearly upright. Fig. 3, the 
same in the third position, bringing the stalks nearly parallel to the 
surface of the culm of grass. Fig. 4, a flower with 2 sepals, one petal 
and three quarters of the lip taken away ; the long bractis seen clinging 
round the base of the ovary, and the pear-shaped stigmatic chamber is 
represented as having been touched with pollen, grains of which are seen 
adhering on its surface ; above this chamber the pouch projects, standing 
high above the surface of the lip, and on either side of the Anther, glands 
or staminodia are found. These glands (staminodia) indicate the position 
of the Anthers in Cypripedium.: Fig. 5, a section of the spur cut 
parallel to the column, showing a curious fold in the interior which is 
