I. ORCHIDEiE. 
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1. ARTIFICIAL KEY TO THE GENERA. 
A. Perennial epiphytes, with evergreen leaves. Pollen waxy, except in 1. 
Stems slender, leafy. Sepals free. Disk of lip naked. Pollen gra- 
nular 1. Earina. 
Stem slender, leafy. Lateral sepals adnate with column. Lip with 
crests on face 2. Dendrobium. 
Leaves in pairs on pseudobulbs 3. Bolbophyllum. 
Stems very short, leafy. Lip concave, middle lobe solid .... 4. Sarcochiia's. 
B. Stems annual ; roots terrestrial, bulbous, tuberous, or rarely creeping, 
a. Leaf solitary, broad, membranous. 
Flower 1, sessile, purple, large. Sepals very long, filiform ... 9. Corysanthes. 
Flower 1, long-peduncled. Sepals broad, upper concave .... 8. Adenockilus. 
Flowers few. Sepals and petals acuminate or awned 6. Acianthus. 
Flowers few. Sepals and petals linear, obtuse 7. Cyrtostylis. 
j3. Leaf solitary ( rarely 0 in Prasophyllum), slender, flat or terete (2 broad in Caladenia 
bifolia). 
Leaf tubular. Flowers many, minute, with the lip below' . . .10. Microtis. 
Leaf linear or terete. Flowers many, minute, with the lip uppermost 17. Prasophyllum. 
Leaf flat, pubescent. Flowers 1-4, pink. Lip glandular . . .11. Caladenia. 
Leaf terete, thick. Flowers 1 or more, yellow or blue. Lip sepals 
and petals all similar 15. Thelymitra. 
y. Leaves 2 or more, rarely 0 in Pterostylis ( see Caladenia bifolia, in /3). 
Flower solitary, large, green, galeate. Lip small, uarrow . . .12. Pterostylis. 
Flower solitary. Upper sepal arched. Lip with large, purple glands 13. Chiloglottis. 
Flowers several. Upper sepal galeate. Lip with 5 ridges . . . 14. Lyperanthus. 
Flowers several. Upper sepal galeate. Lip 3-lobed 18. Orthoceras. 
Mowers numerous. Upper sepal oblong. Lip with crumpled edges 16. Spiranthes. 
5. Leaves 0. Stem stout, with brown sheathing scales. 
Flowers numerous, brown. Sepals united in an urceolate tube . . 5. Gastrodia. 
2. NATURAL CLASSIFICATION OF THE GENERA. 
1. Anther terminal, deciduous. Pollen masses granular, attached to a short caudicle : — 
1, Earina. 
2. Anther terminal, deciduous. Pollen masses wasy, attached to a broad caudicle: — 
2, Dendrobium; 3, Bolbophyllum : 4, Sarcociiilus. 
3. Anther terminal, deciduous. Pollen masses of large loose grains, without caudicle : — 
5, Gastrodia. 
4. Anther terminal, persistent. Pollen masses attached by their bases to the stigmatie 
gland: — 6, Acianthus; 7, Cyrtostylis; 8, Adknochilus; 9, Corysanthes; 10, 
Microtis; 11, Caladenia ; 12, Pterostylis; 13, Chiloglottis ; 14, Lyperanthus. 
5. Anther parallel to the stigma, at the back of the column, persistent. Pollen masses 
attached by threads to the stigmatie gland : — 15, Thelymitra; 16, Spiranthes, 17, 
Prasophyllum; 18, Orthoceras. 
1. EARINA, Linclley. 
Rigid, erect, tufted epiphytes. Stems leafy, simple, compressed. Leaves 
distichous, narrow linear, numerous. Flowers small, whitish, in terminal 
simple or branched bracteate spikes or panicles. — Sepals and petals nearly 
equal, spreading, ovate or oblong. Lip superior, sessile or shortly stalked, 
3-lobed, disk eglandular, lateral lobes incurved. Column short. Pollen- 
masses 4, granular, united in pyriform pairs to a small short caudicle, which 
comes away with them. 
