7. Leaf solitary or 2 oppositely placed on the stem, attached to or spreading near 



middle of stem, broad and short (8) 



8(7). Stem produced from a small bulbous corm; leaves 1 or 2; lip broad and 

 short, obliquely tridentate or acutish at the apex 9. Malaxis 



8. Stem produced from a slender rhizome; leaves always 2, opposite; lip narrow 



and elongated, deeply bilobed 2. Listera 



1. Habenaria Willd. 



Terrestrial or semiaquatic herbs with fleshy or tuberous roots; roots ovoid to 

 fusiform-elongated or rarely palmate; plants erect, simple, glabrous; stem leafy or 

 merely bracted; leaves one or more, basal or cauline, essentially sessile, with the 

 basal part sheathing the stem; flowers usually small, in showy or inconspicuous 

 racemes; sepals free, similar or dissimilar; dorsal sepal erect or incurved to form a 

 hood over the column; lateral sepals spreading or deflexed; petals free, erect, 

 usually connivent with the dorsal sepal, simple or bipartite; lip lowermost or 

 occasionally uppermost, simple or tripartite (the divisions cuneate to filiform- 

 setaceous, entire or variously toothed or fringed), entire, toothed or fringed, 

 extended at the base to form a spur; spur elongated and filiform or filiform- 

 clavellate, shorter to much longer than the pedicellate ovary; column short; stigmas 

 with or without papillose processes; anther cells two, separate, relatively distant; 

 pollen granular, attached to exposed glands (not contained in a pouch); capsules 

 narrowly cylindrical to ellipsoid. 



A polymorphic genus of approximately 500 species native mainly to the warmer 

 regions of the world. 



1. Lip deeply 3-parted, that is divided at least halfway to the base of the lamina 



(2) 

 \. Lip simple (not 3-parted), linguiform, ligulate, linear or lanceolate, at most 

 fringed, angled, notched or lobed (4) 



2(1). Divisions of the lip fringed; petals simple (not 2-parted), crenate at most.. 

 1. H. lacera. 



2. Divisions of the lip not fringed, entire, linear or linear-filiform; petals 



2-parted (3) 



3(2). Spur more than 4 cm. long, much longer than the pedicellate ovary (often 

 as much as 6 times as long); lateral divisions of the lip 1.5 cm. 

 long or more 2. H. quinqueseta. 



3. Spur less than 2 cm. long, about as long as the pedicellate ovary; lateral divi- 



sions of the lip less than 1.3 cm. long 3. H. repens. 



4(1). Lip copiously ciliate-f ringed (5) 



4. Lip not fringed, at most coarsely erose (8) 



5(4). Flowers white, occasionally tinged with cream-color; lip narrowly ovate- 

 oblong 4. H. Blephariglottis. 



5. Flowers yellow or orange-color; lip ovate to oblong (6) 



6(5). Lip oblong, more than 8 mm. long; spur longer than the pedicellate ovary.. 

 5. H. ciliaris. 



6. Lip ovate, less than 6 mm. long; spur shorter than the pedicellate ovary (7) 



7(6). Spur less than 1 cm. long 6. H. cristata. 



7. Spur more than 1.1 cm. long 7. H. X Chapmanii. 



8(4). Lip entire or only crenate, not noticeably lobed nor notched (9) 



8. Lip angled or lobed at the base (rarely entire) or trilobulate or tridentate at 



the apex (19) 



691 



