818 THE ORCHID FAMILY. 



appreciate, that the species of both genera are included in the follow- 

 ing table. 



Spur of the perianth very slender^ and longer than the 

 ovary. 

 Flowers white, rather large, in a loose panicle. Two 



leaves only at the base of the stem 1. Butterfly H. 



Flowers usually red, rather small, in a dense spike. 

 Leaves several, narrowed. 

 Tubers of the rootstock entire. Spike ovate or pyra- 

 midal, very dense 9. Pyramidal O. 



Tubers lobed or divided. Spike cylindrical, at length 



rather loose 10. Fragrant O. 



Spur from half the length to about the length of the ovary. 

 Sepals all converging and arching over the column and 

 petals in the form of a helmet. Tubers entire. 

 Flowers few, in a loose spike. Lip broadly and 



shortly 3-lobed 1. Green-winged 0. 



Flowers numerous, in a dense or long spike. Lip 

 with 2 lateral, smaller lobes, and a large 2-cleft 



middle one 2. Military O. 



Sepals, at least the lateral ones, spreading. Petals, 

 either alone or with the upper sepal, arching over 

 the column. 

 Spike long or loose. Tubers entire. 



Bracts 1 -nerved. Upper sepal arching over the 



petals 4. "Early 0. 



Eracts with several veins. All 3 sepals spreading 5. Loose 0. 

 Spike dense. Tubers lobed. 



Bracts shorter than the flowers. Lip irregularly 



3-lobed 6. Spotted O. 



Lower bracts longer than the flowers. Lip toothed 



or scarcely lobed 7. Marsh O. 



Spur exceedingly shorty or reduced to a small pouch or 

 cavity. 

 Lip linear, 3-lobed, the middle lobe more than an inch 



long 8. Lizard O. 



Lip not above a quarter of an inch long. 



Spike rather loose. Flowers green, rather small, with 

 an oblong hanging lip, rather longer than the 



sepals 3. Green H. 



Spike dense, with numerous small flowers, the lip not 

 longer than the sepals. 

 Flowers purple before expanding. Lip white, 4- 



lobed (3-lobed, with a 2-cleft middle lobe) . . 3. Dwarf O. 

 Flowers white. Sepals ovate. Lip 3-lobed . . 2. Small H. 

 Flowers greenish-yellow. Sepals and petals very 



narrow. Lip 3-lobed Herminium. 



