310 



ORCHIDACEAE 



Anthers 2 : lip a large inflated sac. 



Caulescent : leaves several : lip with a rounded opening : sterile stamen glabrous : stigma broadest 



sterile stamen 



at the base. 

 Scapose : leaves 2, basal : lip with a fissure down the front : 



glandular-pubescent : stigma broadest at the apex. 

 Anther solitary : lip various. 



Anther adnate to the column, erect, persistent. 



Lip with a tubular spur at the base : anther adnate to the apex of the col- 

 umn : sacs separate. 



Glands of the stigma enclosed in a pouch. 

 Glands of the stigma not enclosed in a pouch. 

 Stigmas without appendages. 



Lip entire or merely notched at the apex. 

 Stems normally leafy : 



anther-sacs parallel or nearly so. 

 nther dilated at the base, enclosing the 



glands surrounded by 



Valves of the 



glands. 

 Valves of the anther not dilated 



a thin membrane. 

 Stems scape-like, with 1 or 2 basal leaves and several scale-like 



leaves above : anther-sacs divergent. 

 Lip cutrtoothed or fringed. 

 Stigmas with appendages. 



Anther-bases with long slender appendages. 

 Lip 3-parted : stigmas erect. 

 Lip entire : stigmas drooping. 

 Anther-bases without appendages. 

 Lip spurless, or if with a spur, this merely sac-like : anther adnate to the 



back of the column ; sacs approximate. 

 Pollen masses 2. 



Lip flat, at least not saccate. 



Stems with alternate leaves, these often more or less reduced to 



scales : lip neither cleft nor parted. 

 Lip without a spur : stem-leaves partially or wholly reduced to 



scales. 

 Lateral sepals and column not decurrent on the ovary : 



foliage bright green. 



Lip merely adherent to the column or free and not embrac- 

 ing it : stigma 2-cleft : lip with callosities at the base. 

 Lip adnate to the column and embracing it : stigma en- 

 tire, pointed : lip without callosities. 

 Lateral sepals and column conspicuously decurrent on the 



ovary : foliage yellowish green. 



Lip with a sac-like spur : stem leaves not reduced to scales. 

 Stems with two opposite leaves : lip 2- c left or 2-parted. 

 Lip sac-like. 

 Pollen masses 4. 



Anther attached to the apex of the column like a lid, deciduous. 

 Pollen in loose powdery masses. 



Erect herbs with terminal spikes or racemes, or a solitary flower. 

 Scapose : leaves basal, sometimes mere scales. 



Leaves basal, sheathing the scape : bracts alternate : column 



winged at the apex. 

 Leaves none or mere basal scales : bracts leaf-like, whorled at 



the top of the scape. 

 Caulescent: leaves usually solitary or rarely several. 



Column club-shaped or very short, wingless : pollen-masses 2 or 



2-parted. 



Flowers normally solitary, terminal : lip crested. 

 Flowers axillary, forming few-many-flowered racemes: lip 



not crested. 

 Column elongated. 

 Column very short. 



Column dilated above, petal-like: pollen-masses 4. 

 Vines with axillary racemes. 

 Pollen in waxy masses. 



Pollen-masses without either elastic connecting tissue or stalks. 

 Stems furnished with normal leaves. 



Leaves sheathing the scape to near the middle : column minute, 



2-toothed at the apex. 

 Leaves barely sheathing the scape : column elongated, incurved, 



margined above. 

 Stems furnished with clasping or sheathing scales. 



Rootstocks coral-like : lip with a short spur adnate to the ovary : 



proper leaf none. 

 Rootstocks conn-like : lip spurless : proper leaf solitary, but absent 



during anthesis. 

 Pollen-masses with elastic connecting tissue and stalks. 



Lip with a slender free spur : scapes naked or nearly so : pollen- 

 masses 2 or 4. 



Terrestrial plants : pollen-masses 4. 

 Epiphytic plants : pollen-masses 2. 

 Lip spurless or the short spur adnate to the ovary. 

 Lip or its claw markedly adnate to the column. 

 Lip or its claw not adnate to the column. 

 A. Flower-stalk terminal. 



Pollen-masses 4 : plant epiphytic, with large leaves near the 

 base : inflorescence branched. 



1. CYPRIPEDIUM. 



2. FISSIPES. 



3. GALEORCHIS. 



4. PERULARIA. 



5. COELOGLOSSUM. 



H. LYSIAS. 



7. BLEPHARIGLOTTLS. 



8. HABENARIA. 



9. HABENELLA. 



10. GYMNADENIOPSIS. 



11. GYROSTACHNS. 



12. BEADLEA. 



1:5. STKNOUHYNCHUS. 



1 I. I'll YsriM'S. 

 l, r >. LI8TKKA. 



16. PERAMIUM. 



17. PONTHIEVA. 



18. LlMODORUM. 



19. I8OTK1A. 



20. POGONIA. 



21. TlMl'Moi: \. 



22. KriF'ACTis. 

 28. ARETHUSA. 

 24. VANILLA. 



25. ACHROANTHES. 



26. LEPTORCHIS. 



27. CORALLORHIZA. 



28. APLECTRUM. 



29. TIPULARIA. 



30. DENDROPHYLAX. 



31. EPIDENDRUM. 



32. POLYSTACHYA. 



