310 
ORCHIDACEAE 
Anthers 2: lip a large inflated sac. 
Caulescent: leaves several: lip with a rounded opening: sterile stamen glabrous: stigma broadest 
1. CYPRIPEDIUM. 
at the base. 
Scapose: leaves 2, basal: lip with a fissure down the front: sterile stamen 
glandular-pubescent : stigma broadest at the apex, 
Anther solitary : lip various. 
Anther adnate to the column, erect, persistent. 
Lip ap 
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. 
Valves of the anther dilated at the base, enclosing the 
glands. 
Lip with a tubular spur at the base: anther adnate to the apex of the col- 
Valves of the anther not dilated: glands surrounded by 
a thin membrane. 
Stems scape-like, with 1 or 2 basal leaves and several scale-like 
leaves above: anther-sacs divergent. 
Lip eut-toothed or fringed. 
Stigmas with 
appendages. 
Anther-bases with long slender appendages. 
Lip 3-parted : stigmas erect. 
Lip entire: stigmas drooping. 
Anther-bases without appendages 
urless, or if with a spur, this merely 
ack 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 
'sac-like : anther adnate to the 
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- 
a 2-cleft : lip with callosities at the base. 
e column and embracing it: stigma en- 
inted : lip without callosities. 
Lateral sepals and column conspicuously decurrent on the 
L 
Lip sac-like. 
_ ing it: sti 
ip adnate to 
tire, 
E . ovary : foliage yellowish green. 
Lip with a sac-like spur: stem leaves not reduced to scales. 
Stems with two opposite leaves: lip 2-cleft or 2-parted. 
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. 
Seapose : 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 ial Pa py 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. 
Colu 
mn 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-toot. 
hed at the apex. 
Leaves barely sheathing the scape: column elongated, incurved, 
margined above. : 
Stems furnished with clasping or sheathing scales. 
Rootstocks coral-like : 
proper leaf none. 
Rootstocks corm-like : lipspurless : proper leaf solitary, but absent 
du 
Pollen-masses wit 
anthesis. 
ip with a short spur adnate to the ovary : 
h 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 ipe adnate to the ovary. 
Lip or its claw marked 
y 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. 
2. FISSIPES. 
M2 o gos 
. GALEORCHIS. 
. PERULARIA. 
. COELOGLOSSUM. 
. LYSTAS. 
. BLEPHARIGLOTTIS. 
. HABENARIA. 
. HABENELLA. 
. GYMNADENIOPSIS. 
. GYROSTACHYS. 
. BEADLEA. 
. STENORHYNCHUS. 
. PHYSURUS. 
. LISTERA. 
. PERAMIUM. 
. PONTHIEVA. 
18. LIMODORUM. 
19. ISOTRIA. 
21. 
. POGONIA. 
TRIPHORA. 
. EPIPACTIS. 
23. ARETHUSA. 
24, 
VANILLA. 
25. ACHROANTHES. 
26. LEPTORCHIS. 
27. CORALLORHIZA. 
28. APLECTRUM. 
29. 
30. 
31. 
32. 
TIPULARIA. 
DENDROPHYLAX. 
EPIDENDRUM. 
POLYSTACHYA. 
