490 
XCVIII. ORCHIDACEJE 
position that the pollen comes in contact with the stigma of the next flower 
visited. The structural details by which this transference of pollen is facili- 
tated differ in the several genera, and in some cases they are of a wonderful 
mechanical complexity. 
A reference is given to the second edition of Darwin’s work whenever the 
species or an allied species is therein described. 
Anther one. Pollen cohering in pollinia. 
Perianth-segments united in a tube .... 
Perianth-segments distinct or only united near the 
base. 
Lip not spurred. 
Lip flat at the base. 
Lip short, broad, flat. 
Lip without glands at the base 
Lip with 2 small glands or glandular spots at 
the base ....... 
Lip long, deeply 3-lobed, mid-lobe large. 
Leaves 1 or 2, stalked. Column long, curved . 
Leaves usually several, base sheathing. Column 
short, thick ...... 
Lip long, narrow, 2-lobed at the tip . 
Lip concave at the base. 
Flowers sessile. 
Root fibrous. 
Spike spirally twisted .... 
Spike straight, one-sided .... 
Root tuberous ...... 
Flowers shortly stalked. 
Sepals and petals erect, tips converging . 
Sepals and petals spreading .... 
Lip spurred. 
Root fibrous. 
Height 6-10 in. Leaves ovate, netted with yellow 
veins ....... 
Height 12-24 in. Leaves narrowly lanceolate, 
not netted ....... 
Root creeping, producing a number of short, thick 
branches. Leaves none ..... 
Root tuberous. 
Glands of pollinia enclosed in a pouch 
Glands of pollinia naked. 
Stem bearing a single bract and one basal leaf 
Stem leafy, at least at the base. 
Spur one ....... 
Spurs two ...... 
Anthers two. Pollen-grains not cohering in pollinia. 
Lip folded, forming an inflated pouch 
9. Gastrodia. 
1. Microstylis. 
2. Liparis. 
3. Oreorchis. 
4. Calanthe A 
7. Neottia.. 
6. Spiranthes. 
8. Goodyera. 
14. Herminium. 
11. Cephalanthera. 
12. Epipadis. 
5. Ancedochilus. 
4. Calanthe . 2 
13. Orchis. 
16. Hemipilia. 
15. Habenaria. 
17. Satyrium. 
18. Cypripedium. 
1. MICROSTYLIS. From the Greek micros , small, and stylon, 
a column ; referring to the short column.' — Temperate and tropical 
regions, absent from S. Africa and Australia. 
Root fibrous. Flowering-stem 6-18 in., erect, swollen at the 
base. Leaves 1 or 2 or 2-4, base sheathing. Flowers small or 
minute ; bracts lanceolate, shorter than the ovary. Sepals and 
Except C. plantaginea. 
