83. ORCHIDACEJE. 395 



stigmas reflexed. A. N. H. ser. 2. i. t. 8. E. B. S. 2993. 

 JElodea canadensis Pdch. P St. long, branching; whorls of leaves 

 many, close together. Fl. very small but with a very long slender 

 tube often 2 or 3 in. long. The spath in the axil of a leaflike 

 bract placed within the whorl of leaves. Sep. tinged with green 

 and pink externally, incurved, hooded. Pet. flat, transparent, 

 recurved, oblong. Filaments at first curved outwards, their 

 points placed under the hood of the sepals, afterwards erect, 

 linear, blunt. Anth. 0. Stigmas recurved, linear, or deeply 

 bifid. Sep. pet. and stigmas of about equal length. Style ad- 

 nate on 3 sides of the tube. In water. Probably introduced 

 from America. Canals and rivers. P. VII. IX. E. S. I. 



Order LXXXIII. ORCHIDACE^l. 



Sep. 3, usually coloured. Pet. 3, 2 above, 1 below (lip) fre- 

 quently lobed and spurred and unlike the others. Stam. 3, united 

 in a central column, 2 lateral abortive, or (in Cypripedium) the 

 middle one abortive. Pollen powdery or cohering in masses. 

 Ovary 1-celled, inferior, with 3 parietal placentas. Style form- 

 ing part of the column with the stamens ; stigma a viscid space 

 in front of the column. Caps. 3-valved. Seeds very many, 

 minute. Testa loose, netted. Raphidiferous. 



Tribe I. OPHRYDINE&. Anther wholly adnate to the co- 

 lumn. Pollen-masses in divisible lobes which are indefinite 

 in number and waxy, stalked. Hoot with 2 fleshy entire or 

 palmate knobs below the fibres. 



* Anther-cells with a prolongation of the stigma between their bases. 



1. ORCHIS. Perianth ringent, hooded. Lip 3-lobed, spurred. 

 Glands of the stalks of the pollen-masses in a common pouch. 



2. GYMNADENIA. Glands of the pollen-masses without a 

 pouch. Otherwise like Orchis. 



3. ACEHAS. Lip without a spur. Otherwise like Orchis. 



** A plate in front of the glands of the pollen-masses. 



4. NEOTINEA. Perianth ringent, hooded. Lip 3-lob^d, 

 spurred. Glands of the pollen-masses in separate hollows 

 behind the broad recurved rostellum, which is bounded 

 laterally by 2 semicylindrical ascending processes diver- 

 ging from its base. 



