PoGONiA. CXL. ORCHIDACEiE. 1»5 



/?. (O. incisa. WUld.) Lateral petals suMentate, terminal one incisely den- 

 tate; sp7<r subulate, 



18. O. LEUcoPHiEA. Nutt. Wkite-Juncered or Prairie Orchis. 



St. leafy ; Ivs. lanceolate, tapering to a narrow, obtuse point, channeled ; 

 bracts shorter than the ovaries ; roc. oblong ; sep. roundish-oblong, acutish ; 

 lateral petals obovate, denticulate; lip 3-parted, flabelliform, segments deeply 

 fimbriate; spur subulate-clavate, curved, twice as long as the ovary. — Wet 

 prairies, Ohio, Ind. ! 111. Stem 1 — 3f high. Leaves 2 — 6' long. Raceme about 

 i3-flowered. Sepals and spur yellowish, petals white. Ovary curved, 1' long. 



19. O. GRANDiFLORA. Bw. (Habeuaria. Torr. Platanthera fimbriat^L 

 Liindl.) Large-flowering Orchis. — Lmcer Ivs. oblong, oval, obtuse, upper 



ones very narrow ; bracts shorter than the ovary ; roc oblong ; Up dependent, 

 twice as long as the petals, 3-parted, the segments cuneiform and fimbriate, the 

 middle one largest, with connivent fimbrise ; lateral pet. fimbriate ; spur ascend- 

 ing, clavate, longer than the ovary. — A superb plant, considered the most beau- 

 tiful 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 coLenng 



granules. 



S; ARETHtrSA. Swtz. 

 Arcthusa was a fabulous nymph of Diana, who was tranaformed into a fountain. 



Perianth with its segments cohering at base ; lip spurless, adnata 

 to the column at base, deflected at the end and bearded inside \ pollen 

 angular. — Small plants, inhabiting wet vlaces. 



A. BOLBOSA. Bulbous Arethusa. 



Leafless; rt. producing a globular tuber; scape sheathed, 1-flowered. — 

 This beautiful and interesting plant is found 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 &e flower is a smaU spathe of 2 unequal 

 bracts. June. 



9. POGONIA. Brown. 



G-r. Tttiivuiv, beard; in aJlusion to the bearded lip. 



Perianth with its leaflets distinct ; lip sessile or unguiculate, 

 cucullate, bearded inside ; pollen farinaceous. 



1. P. oPHiOGLOssoiDEs. Br. (Arethusa. Linn.") 



Rt. fibrous ; st. furnished with an oval-lanceolate leaf and a foliaceons 

 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 1) much smaller, situated near the flower. Flower large, 

 fiodding, pale purple. Lip long as petals and sepals (f). June. 



2. P. YERTiciLLATA. Nutt. (Arethusa. Willd.) 



Lis. 5, oblong-lanceolate, verticillate ; fls. 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 Ih' long, J as wide, abruptly acuminate. 

 The flower is remarkable for its sepals teing about 2' long, very narrow, and 

 of a greenish-brown color. Lip crested in the middle. July. 



3. P. PENDULA. Lindl. (Triphora. Nutt. Arethusa. Willd.) 



Rt. tuberous ; st. leafy, about 3-flowered at the top ; Ivs. clasping, ovate, 

 ■alternate ; Jls^ axillary, nodding ; Up entire, scabrous, not bearded ; Jr. pendii 



