714 CXXV. ORCniDACE^. 



Petals 2-partite ; lip 3-lobed or 3-partite. 



Sepals with filiform tips 1. H. stenopetala. 



Sepals acute but not filiform at the tips. 



Lower segment of petals shorter than the upper ; 



pedicels very short or 0; stem leafy upwards 2. H. digitata. 



Lower segment of petals longer than the upper; 

 pedicels long ; stem with leaves at the base only. 

 Leaves mora than one, linear, oblong or lanceo- 

 late, narrowed and sheathing at tiie base; 

 upper segment of petals longer than broad ... 3. H. rarijlora. 

 Leaf solitary, subrotund ; upper segment of petals 



as broad as long 4. H. grandiflora. 



Petals entire. 



Side lobes of lip petaloid, broader than the midlobe. 

 Lip deeply 3-lobed or 3-partite, not or hardly longer 

 than the lateral sepals. 



Side lobes of lip small, rounded 6. H. platyphylla. 



Side lobes of lip large, obliquely truncate and 



denticulate at the apex 6. H. suaveolens. 



Lip deeply 3-lobed or 3-partite, much longer than the 

 lateral .sepals. 



Lobes of lip with long filiform tails 7. H. criiiifera. 



Lobes of lip not tailed. 



Spur reaching 4 in. long ; lateral sepals 5 in. 



long 8. H. longecalcarata. 



Spur \\ in. long ; lateral sepals 5 in. long ... 9. H. plantaginea. 

 Side lobes of lip not broader than the midlobe. 



Tubes of the anther-cells long ; lateral sepals very 

 gibbous with many arched nerves ; stem leafy 



upwards 10. H. commeliyiifolia. 



Tubes of tiie anther-cells short. 

 Stem leafy upwards. 



Bracts large, cucullate ; flowers secund. 



Leaves 1^ in. long; spur subacute; flowers 



greenish-yellow 11. H. Hcyneana. 



Leaves 2 in. long ; spur subobtuse ; flowers 



white 12. H. suhpnbens. 



Leaves 3-fi, clustered towards the middle or at the 

 base of the stem. 



Bracts as long as or longer than the ovary ; 

 lateral segments of lip narrower than the 

 central linear segment. 



Spur not longer than the ovary ; lateral 



segments of liii slender but not filiforu), 



scarcely or not longer than the midlobe. 



Spur slender, incurved ; leaves green 



tiu'oughout, placed near the middle 



of the stem 13. H. affints. 



Spur stout, clavate ; leaves witli nar- 

 row yellowish margins, placed near 



the base of the stem 14. H. marginata. 



Bracts much shorter than the ovary ; spur 

 slightly exceeding the ovary, thickened 

 below ; loaves green throughout, placed 



near the base of the stem 15. //, vi rid (flora var. 



DaLcllii. 

 Leaves 2 (rarely 3), radical or opposite on the 

 stem, broadly ovate or suborbicular, cordate at 

 tlio base. 



Plant 8-18 in. liigh ; bracts ^-f in. long ; 

 lateral lobes of lip shorter than the mid- 

 lobe 10. //. rras^i/iilia. 



Plant 4-10 in. high ; bracts ^ in. long ; lateral 



lobes of lip longer than the midlobe 17. II. dij>hj/llii. 



