Pogonia, CXL. ORCHIDACE. 535 
B. (O. incisa. Willd.) Lateral petals subdentate, terminal one incisely den- 
tate ; spur subulate. ’ 
18. O. LEucoPHEA. Nutt. Wiite-flowered or Prairie Orchis. 
St. leaty; dvs. lanceolate, tapering to a narrow, obtuse point, channeled; 
6racis shorter than the overies; rac. oblong; sep. roundish-oblong, acutish ; 
~ laierad peials obovate, denticulate; /’p 3-parted, flabelliform, segments deeply 
fimbriate ; spur subulate-clavate, curved, twice as long as the ovary—Wet 
prairies, Ohio, Ind.! lll. Stem 1—3i high. Leaves 2—6/ long. Raceme about 
12-flowered. Sepals and spur yellowish, petals white. Ovary curved, 1’ long. 
19. O. GRANDIFLORA. Bw. (Habenaria. Tvrr. Platanthera fimbriata. 
Lindl.) Large-flowering Orchis—WlLower lvs. oblong, oval, obtuse, wpper 
ones very narrow; bracts shorter than the ovary; rac. oblong; lip dependent, 
twice as long as the petals, 3-parted, the segments cuneiform and fimbriate, the 
middle one largest, with connivent fimbrize ; /ateral pet. fimbriate ; spur ascend- 
ing, clavate, longer than the ovary.—A superb plant, considered the most beau- 
titul of the genus, in wet meadows, N. H.! Can. Stem 2—3f high, thick, hol- 
low, with several sheathing bracts at base. Leaves 2 or 3 principal ones, 4—7’ 
by 1—2’, upper ones linear, an inch or two long. Flowers very large, purple, 
in a terminal raceme, 3—6’ long. Middle seg. of the lip nearly semicircular, 
twice as long as the lateral ones. June. 
Section 3. Pollen powdery, or consisting of loosely cohering 
granules. 
8. ARETHUSA. Switz. 
Arethusa was a fabulous nymph of Diana, who was transformed into a fountain. 
Perianth with its segments cohering at base; lip spurless, adnate 
to the column at base, deflected at the end and bearded inside ; pollen 
angular.— Small plants, inhabiting wet places. 
A. BuLBOsa. Bulbous Arethusa. 
Leafless; 7¢t. producing a globular tuber; scape sheathed, 1-flowered.— 
This beautiful and interesting plant isfound only in wet meadows and swamps, 
Can. to Va. Stem 6—12’ high, invested with about 3, long, loose sheathes with 
lanceolate points, the upper ones rarely at length produced into a short, linear- 
spatulate leaf. At the top is a single, large, fragrant flower of a rich purple 
color. A little below the base of the flower is a small spathe of 2 unequal 
bracts. June. ; 
9. POGONIA. Brown. 
Gr. twywy, beard ; in allusion to the bearded lip. 
Perianth with its leaflets distinct; lip sessile or unguiculate, 
cucullate, bearded inside ; pollen farinaceous. 
1. P.-opHioGLosséipes. Br. (Arethusa. Linn.) 
Rt. fibrous ; st. furnished with an oval-lanceolate leaf and a foliaceous 
bract near the flower; lip fimbriate—An interesting plant, much taller than 
the bulbous Arethusa, found in swamps and muddy shores, Can., N. Eng. to 
Car. and Ky. The stem is very slender, 9—16’ high, with 2 remote leaves, the 
one placed about midway, 2—3’ long, lanceolate, acute, sheathing at the base; 
the other (a bract?) much smaller, situated near the flower. Flower large, 
nodding, pale purple. Lip long as petals and sepals (?/). June. 
2. P. verticiuLAta. Nutt. (Arethusa. Willd.) 
Iws. 5, oblong-lanceolate, verticillate ; fs. solitary, the 3 outer petals very 
long, linear, inner ones shorter, lanceolate, obtuse; lip 3-lobed, the middle lobes 
undulate—Swamps. Stem 8—12’ high, with a whorl of leaves near the top 
and a flower 1—2’ above it. Leaves 14’ long, }as wide, abruptly acuminate. 
The flower is remarkable for its sepals being about 2’ long, very narrow, and 
of a greenish-brown color. Lip crested in the middle. July. 
3. P. penpULa. Lind]. (Triphora. Nutt. Arethusa. Willd.) 
_ Rt. tuberous; st. leafy, about 3-flowered at the top; luvs. clasping, ovate, 
alternate; fs, axillary, nodding; lip entire, scabrous, not bearded; fr. pendu 
