KEY TO THE FAMILIES AND CENERA 



123 



DD. Infl. of 2 to few drooping fls.; lip 



turned upwards 83. Paphinia. 



cc. Stalk of pollinia short ; fls. many 84. Bateman- 



[nia. 

 AA. Pollinia upon 2 separate stalks 85. Bifrenaria. 



23. Zygopetalum Tribe. 



A. Lip clawed distinctly 86. Colax. 



AA. Lip not distinctly clawed. [lum. 



B. The Up with horseshoe-shaped callus 87. Zygopeta- 



BB. The lip with few longitudinal lamellro 88. Eriopsis. 



24. Gongora Tribe. 



A. Lip turned downwards. 

 B. Fls. with sepals and petals erect or incurved. 

 c. Hypochil separated from column by a 



strong stricture; no pleuridia 89. Lacsena, 



cc. Hypochil united with column by a broad 



base: pleuridia present. 

 D. Epichil movably attached to hypochil; 



pollinia with short stalk at most 90. Peristeria. 



DD. Epichil immovably attached to hypo- 

 chil; pollinia with elongated stalk. ... 91. Acineta. 

 BB. Fls. with sepals and petals spreading or 



reflexed. 



c. Lateral sepals much larger than the dor- 

 sal sepal and petals 92. Coryantkes. 



cc. Sepals and petals nearly alike. 

 D. Hypochil concave; epichil flat. 



E. Pollinia 2 93. Stankopea. 



EE Pollinia 4 94. Aganisia. 



DD. Hypochil not concave 95. Houlletia. 



AA. Lip turned upwards 96. .Gongora. 



25. Dendrobium Tribe. 



A. Sts. many-jointed; rhizome short. 

 B. Lip without callus, or with lamellate or 



elevated lines 97. Dendro- 



BB. Lip with basal callus: joints of st. long-fila- [bium. 



mentose 98. Inobulbon. 



AA. Sts. 1- or rarely 2-jointed; rhizome long- 

 creeping 99. Sarcopod- 



[ium. 



26. Bulbophyllum Tribe. 



A. Lateral sepals with their outer margins adher- [lum. 



ing, except at the free base 100. Cirrhupeta- 



AA. Lateral sepals free 101. Bulbophyl- 



[lum. 



27. Maxillaria Tribe. 



A. Lip without claw, movable: Ivs. normal 102. Maxillaria. 



AA. Lip clawed, or adnate to column-base: Ivs. 



whip-shaped 103. Scuticaria. 



28. Huntleya Tribe. 



A. Pseudobulbs distinct 104. Promensea. 



AA. Pseudobulbs wanting or rudimentary. 



B. Lip entire 105. Chondror- 



BB. Lip lobed. [rhyncka. 



c. Callus of lip fringed 106. Huntleya. 



cc. Callus not fringed. 



D. Column boat-shaped, concave 107. Bollea. 



DD. Column slender, not concave. 



E. Claw very short: callus free in front 



and resting upon the lip 108. Warscevric- 



[zeUa. 

 EE. Claw distinct: callus not free in front. 109. Pescatorea. 



29. Cymbidium Tribe. 



A. Lvs. many: sts. elongated 110. 



AA. Lvs. few: sts. short. 



B. Sts. concealed by the If. -sheaths. 



c. Pollinia pear-shaped, upon a quadrate 



stalk: st. not bulbous 111. 



cc. Pollinia round, upon a stalk much broader 



than high: st. bulbous 112. 



BB. Sts. naked : Ivs. only at its apex 113. 



30. lonopsis Tribe. 



A. Sepals free 1 14. 



AA. Sepals, the lateral ones, united, at least below. 



B. The lip spurred 115. 



BB. The sepals spurred. 



c. Spur short 116. 



cc. Spur long and slender 117. 



Grammat- 

 [ophyUum. 



Cyperor- 



[chis. 

 Cymbid- 



[ium. 

 Gram- 



[mangis. 



Trichocen- 

 [Irum. 

 Rodri- 



[guezia. 

 lonopsis. 

 C'&mparet- 

 [tia. 



31. Ada Tribe. 



A, Lvs. flat. 



B. Sepals free 118. Ada. 



BB. Lateral sepals united 119. Mesos- 



[pinidium. 

 AA. Lvs. cylindric 120. Quekettia. 



32. Trichopilia Tribe. 

 Lip rolled around the column 121. Trichopilia. 



33. Aspasia Tribe. 



A. Middle lobe of lip broad 122. .tspaia. 



AA. Middle lobe of lip narrow 123. Cochlioda. 



34. Odontoglossum Tribe. 



A. Lip surrounding column with 2 longitudinal 



calluses: blade reflexed 124. Gomeza. 



AA. Lip not as above. . 



B. Base of lip parallel to column and some- 

 times adnate to it 125. Odontoqlos- 



BB. Lip spreading from base of column. [num. 



c. Lateral sepals united entirely; lip like 



dorsal sepal 126. Palum- 



cc. Lateral sepals free or only partly united; [bina. 



lip unlike dorsal sepal. 

 D. Sepals and petals long and much 

 attenuated ; lip entire or fiddle- 

 shaped 127. Braasia. 



DD. Sepals and petals not much attenuated . 



E. The lip entire, flat, broad 128. Miltonia. 



BE. The lip mostly 3-lobed, with warts 



or a cushion at base 129. Oncidium. 



35. Aerides Tribe. 



A. Lip movaljly jointed to column. 



B. Middle lobe of spurless lip flat 130. Renan- 



(thera. 



BB. Middle lobe of spurred lip compressed 131. Arach- 



AA. Lip immovably united with column. [nanthe. 



B. Spurless. 



c. Column without a foot. 



D. Summit of lip laterally compressed. . . . 132. Vandopsis. 



DD. Summit of lip not compressed 133. Luisia. 



cc. Column with a foot, the lateral sepals 



attached to it 134. Phalaenop^ 



BB. Spurred. [is. 



c. Column without a foot. 



D. Pollinia upon a single stalk. 

 E. Spur appendaged. 



F. With a longitudinal septum 135. Sarcanthua. 



FF. With the mouth covered with a 



plate 136. Cleisos- 



EE. Spur not appendaged. [toma. 



F. Stalk of the pollinia filiform. 



a. Fls. firm; lip turned downwards.. 137. Saccola- 



[6mm. 



GO. Fls. fragile; hip turned upwards. . 138. Acampe. 

 FF. Stalk of the pollinia broadened 

 upwards or throughout. 



G. Spur short and broad 139. Vanda. 



GO. Spur long and slender 140. Anffraecum, 



DD. Pollinia on 2 separate stalks, or these 



united by the gland. 

 E. Stalks membranous, the pollinia 

 attached to the face. 



F. Plants leafy: lip entire 141. Mocropleo 



[trum. 



FF. Plants without Ivs.: lip 3-Iobed . . . 142. Polyrrhizo. 

 EE. Stalks slender. 



F. Column bent toward the dorsal 



sepal 143. Listro- 



[stochya. 



FF. Column straight 144. Mystoci- 



cc. Column with a foot, the lateral sepals [dium. 



attached to it. 



D. Spur curved upwards against the lip- 

 blade 145. ASridea. 



DD. Spur straight or reflexed. 



E. Lip 3-lobed 146. Camarotis. 



EE. Lip entire 147. Rhyn- 



[chostylis. 



Other orchid genera entered are: Acriopsis, Arethusa, Brom- 

 headia, Collabium, Corysanthes, Cryptophoranthus, Cryptostylis, 

 Diuris, Eria, Eriochilus, Geodorum, Govenia, Holothnx, lone, 

 Ijepanthes, Lueddemannia, Megaclinium, Monomnria, Moorea, 

 Neolauchea, Neottia, Nervilia, Neuwiedia, Notylia, Obcronia, 

 Octomeria, Ornithidium.Ornithocephalus, Ornithochilus, Panisea, 

 Physosiphon, Platylepis, Polycycnis, Pterostylis, Sarcochilus, 

 Satyrium, Scaphyglottis, Schlimmia, Sieyckingia, Sigmatostalix, 

 Solenidium, Stauropsis, Stelis, Stenia, Tainia, Thecostcle, Thely- 

 mitra, Trichoglottis, Trigonidium, Xylobium, and many bi- and 

 tri-generic hybrids. 



184. DIOSCOREACE^E. 



A. Fr. globose and berry-like, indehiscent 1. Tarmta. 



AA. FT. capsular, winged. 



B. Caps. 1-carpelled by abortion 2. Rajania. 



BB. Caps. 3-carpelled or -lobed, winged above... . 3. Testudi- 

 BBB. Caps. 3-carpelled or -lobed, winged below [naria. 



or all around, or rarely not at all 4. Dioscorea. 



