ORCHIDACEM 79 



2. Leaf linear, rounded-obtuse at apex. 



Leaf 5-7 cm. long. 8. D. tenue. 



Leaf 2.5-3 cm. long. 9. D. parvulum. 



3. Leaf narrowly oblanceolate or lanceolate, obtuse. Flowers in a dense 



slender raceme, petals 1-nerved. 



10. D. venustulum. 



11. D. strictiforme. 



4. Leaf, including tbe petiole, 1 dm. or more long, lanceolate to oblong- 



lanceolate, flowers in a loose raceme (except in no. 13), petals 

 3-nerved. 



*Middle lobe of the labelluni subquadrate or transversely 

 oblong, apiculate. 12. D. recurvum. 



**Middle lobe of the labellum triangular. 



13. D. mindorense. 



5. Leaf, including the petiole, rarely exceeding 8.5 cm. in length, lanceo- 



late, flowers in a loose raceme, petals 3-nerved. 



*Petals denticulate or erose-margined at tbe tip. 



14. D. anfractum. 

 **Petals entire. 



■(■Labellum bicallose. 15. D. simulacrum. 



ff Labellum tricallose. 16. D. pumilum. 



B. Lateral lobes of the labellum well developed, smaller than the middle lobe. 



*Lateral lobes of the labellum ovate-oblong. 



17. D. affine. 

 **Lateral lobes of the labellum linear-falcate. 



fMiddle lobe of the labellum quadrate, apiculate. 



18. D. Hutchinsonianum. 

 ffMiddle lobe of the labellum not apiculate. 



19. D. philippinense- 



C. Lateral lobes of the labellum much reduced. 



*Labellum subrotund. 20. D. turpe. 



**Labellum sagittate. 21. D. oliganthum. 



***Labellum hastate. 22. D. hastatum. 



****Labellum pentangular, monocallose. 



23. D. Whitfordii. 

 *****Labellum pentangular, tricallose. 24. D. ocellatum. 



******Labellum pandurate. 25. D. Merrillii. 



III. Platyclinis. 



A. Column arms consisting of a pair of short teeth on each side at base of 



column. 26. D. palawanense. 



B. Column arms well developed. 



1. Lateral lobes of the labellum denticulate. 



a. Column arms basal. 



*Margin of petals entire. 27. D. latifolium. 



**AIargin of petals denticulate. 28. D. longispicatum. 



b. Column arms near the middle of the column. 



*Labellum sulcate, concave. 29. ? D. magnum. 



**Labellum flat. 30. D. uncatum. 



