PoGONiA. CXL. ORCHlDACEiE. 535 



/?. (O. incisa. WiM.) Lateral jkUiIs subdentate, terminal one incisely dea- 

 tate ; spur subulate. 



18. O. LKU(-oi'ii7KA. Nutt. W/iitr-Jlowcred (tr Prairie Orchis. 



St. leafy; lis. lanceolate, tapering to a narrow, ol)lus<' point, channeled; 

 brads shorter than thi" ovaries; rar. olilong; fcp. ronndish-oblon^, acutisli ; 

 lufcral petals obovate, dentieiilate ; tip ^-parted, llabcllilbrin, segments deeply 

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

 prairies, Ohio, Ind. ! 111. Stem I— '.if high. Leaves 2 — 0' long. Raceme about 

 i'2-flowered. Sepals and spur yellowish, petals white. Ovary curved, T long. 



19. O. grandiklOra. Bw. (Habenaria. Tarr. Platanthera fimbriata. 

 Lindl.) Largr-Jlourrini:; Orchis. — Loircr Ivs. oblong, oval, obtuse, vppcr 



oTics very narrow ; bracts shorter than the ovary; rfu. oblong; lip dependent, 

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

 middle one largest, with connivent limbrife ; lateral pet. limbriatc; sjnir 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 — T 

 by 1 — 2', upper ones linear, an inch or two long. Flowers very large, purple, 

 in a terminal raceme, 3— G' 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. A R E T H tj S A. Swtz. 



Arethusa was a fabulous nymph of Diana, who was transformed 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 icet places. 



A. BULBosA. Buibcms Arethusa. 



Leafless ; rf. 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 the flower is a small spathe of 2 unequal 

 bracts. June. 



9. POGONIA. Bro^Ti. 



G-r. TTcoycjv, beard ; in allusion to the bearded lip. 



Perianth with its leaflets distinct ; lip sessile or unguiculate, 

 cucuUate, bearded inside ; pollen farinaceous. 



1. P. opnioGLOssoiDEs. Br. (Arethusa. Linn.) 



Rt. fibrous ; St. furnished with an oval-lanceolate leaf and a foliaceous 

 bract near the flower ; Up 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, 

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



2. P. vKRTiciLLATA. Nutt. (Arcthusa. WiUd.) 



Lvs. 5, oblong-lanceolate, vcrticillate ; fis. 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 H' long, i as wide, abruptly acuminate. 

 The flower is remarkable for it.s sepals being about 2' long, very narrow, and 

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



3. P. PENDLLA. Lindl. (Triphora. Null. Arethusa. WiVd.) 



7?^ tuberous ; .s/. lealy. about 3-flowered at the top ; hs. clasping, ovate, 

 alternate ; fs. axillary, nodding ; Up entire, scabrous, not bearded ; fr. pendii- 



