Orchidea.] orchide^. . 351 



Racemes or flowers on peduncles or scapes inserted on the leafy 

 shoots amongst. or below, the leaves. 

 Pollen-masses 2 or 4. Leaves usually coriaceous or succulent. 

 Racemes leaf-opposed or axillary. 



Leaves terete ] 6. Luisia. 



Leaves flat. 



Labellum constricted in the middle, 2-lobed at the extremity 14. Cottonia. 



Labellum undivided at the end . 15. Acampe. 



Pollen-masses 8. Leaves thin, with prominent veins. Racemes 



on long scapes from below the leaves 18. Limatodes. 



Tribe II. Weottiese. — Anther adnate on the back of the column. Pollen-masses granu- 

 lar. Flowering stems usually leafy, without false-bulbs. Flowers usually sessile* 

 Spikes very short, mostly lateral. Lower sepals connate under the 



labellum. Stem tall, leafy 19. Tropidia. 



Spikes elongated, terminal. Stems leafy near the base. Rhizomes 

 shortly creeping or tuberous and annually renewed. 

 Sepals and petals erect or slightly spreading at the top, 2 lines 

 long or less. 

 Flowers in one spiral row. Labellum oblong, denticulate at the 



end. Leaves linear 20. Spiranthes. 



Flowers in a dense spike, not evidently spiral. 



Labellum concave at the base, shortly recurved at the end. 



Leaves ovate-lanceolate 22. Goodyera. 



Labellum connate with the column at the base, the lower part 

 narrow, with a transverse folding dilatation at the end. 



Leaves linear 21. Zeuxine. 



Lower sepals very spreading, 3 lines long or more. Labellum 



concave at the base, with a transverse dilatation at the end . . 23. H^emaria. 



Tribe III. Ophrydese. — Anther terminal, but adnate on the face of the column. 

 Pollen-masses granular. Flowering stems usually leafy at the base, the rhizomes tuberous 

 or fasciculate, annually renewed. Flowers usually sessile. 

 Labellum with a spur at the base. 



Glands of the pollen-masses enclosed each in a pouch or cavity of 

 the stigma. (Lateral lobes of the labellum long, filiform.) . . 24. Gloss aspis. 



Glands of the pollen-masses naked 25. Habenaria. 



Labellum without a spur. (Leaves small, radical.) . . . . . .26. Aopla. 



Tribe IV. Cypripediese. — Anthers 2, one on each side of the base of a petal-like 

 appendage to the column. 



Labellum large and inflated 27. Cypripedium. 



1. LIPARIS, Bich. 



Sepals and petals free, spreading, all alike, or the petals narrower. Lip 

 erect or ascending, shortly united with the column at the base, entire. Column 

 elongated, incurved, winged at the top. Anther terminal, lid-like. Pollen- 

 masses waxy, in 2 pairs, attached by their summit, but spreading laterally 

 into the 2 anther-cells. — Terrestrial or epiphytes. Leaves at or near the base 

 of the stem, which is often thickened at the base. Flowers small, greenish- 

 yellow or white, in a terminal raceme. 



A considerable genus, chiefly Asiatic and tropical, with a very few species from temperate 

 Asia, Europe, or N. America. 



Leaves thin, 2 or 3 times as long as broad. Perianth of 3 or 4 hues. Labellum with 2 

 tubercles at the base. 



