484 
GYNANDRIA MONANDRIA. 
lis rotundatis, binis la- 
teralibus dentatis; cor- 
nu genuine breviore. 
the two lateral toothed; 
horn shorter than the 
germ. 
Mich. 2. p. 156. Sp. pi. 4. p. 9. Pursh, 2. p. 585. Nutt. 2. p. 188. 
Root tuberous. Stem erect, one to two feet high, slightly angled, leafy, 
glabrous. Leaves four to six inches long, one wide, lanceolate, nerved, 
sheathing at base. Flowers somewhat crowded, in a terminal spike. Pe- 
rianth six-parted, yellow, the three exterior segments oval, entire, equal; of 
the interior the two lateral are smaller than the exterior, obovate, obtuse, 
incised or sharply toothed, the lower or labellum a little longer than the ex- 
terior segments, lanceolate, fringed. Horn about half as long as the germ. 
Filament (Caudicula, Richard) short, thick, bifid, forming the back and up- 
per part of the genitaliferous column. (Gynostemium, R.) Pollinia in- 
curved, ovate, alternate at the summit, with a white gland on one side, open- 
ing at the summit and discharging elastically the pollen, which appears to 
be attached originally to a viscous pedicel. Germ inferior, somewhat spiral, 
attenuated toward the summit. Style short, thick, forming the lower part of 
the gynostemium. Stigma depressed, glandular. Seeds very numerous, 
small. 
Grows in damp soils along the margin of swamps, commonly intermin- 
gled with the two preceding species. It is readily distinguished by its small- 
er and more densely clustered flowers. 
Flowers July— -August. 
4. Lacera. Mich. 
O. labello petalis 
duplo-longiore, tripar- 
tite, laciniis multifidis; 
petalis exterioribus 
ovato-lanceolatis, inte- 
rioribus linearibus; 
cornu germine brevi- 
ore. E. 
Lip twice as long as 
the petals, three-part- 
ed, with the segments 
many cleft; exterior 
petals ovate lanceolate, 
the interior linear; 
horn shorter than the 
germ. 
Mich. 2. p. 156. Pursh, 2. p. 586. 
Root Stem twelve to eighteen inches high, slender, glabrous. 
Leaves narrow lanceolate, nerved, sheathing at base. Flowers rather scat- 
tered along a terminal spike. Bracteal leaf shorter than the germs. Exte- 
rior segments of the perianth equal, ovate lanceolate, rather acute, of the 
interior the two lateral are very narrow, strap-shaped, rather obtuse, as long 
as the exterior, the labellum twice as long, three parted from the middle, so 
t &at the undivided base is nearly as long as the segments. 
