Ordbb 138.— ORCHIDACE^. 688 



2 G. trident^ta LindL St. slender ; lowest Uaf linear-oblong or oblanceolale, ob- 

 tuse, the others 3 or 4, very small and bract-like; lis. 7 to 12, sessile, in a short, 

 open spike ; sep. obtuse, erect-spreading ; lip a little longer, trwncateand 3-iooihed 

 at the apex, produced behind into a slender, often clavellato spur which is longer 

 than the ovary. — In damp woods, Can. and TJ. S. Root a few thick fibers. St. 

 12 to 18' high, leaf about 6', bracts 1' and less. Spike often as wide as long, 

 with small, greenish-white fis. Spur 4 or 5" long, usually curved. Jn., Jl. (0. 

 tridentata Willd.) 



/3. clavellIta has the fls. more diverging and the spur conspicuously club- 

 shaped. — South. 



3 G. flava LindL St. flexuous, leafy ; lower Ivs. nairow-lanceolate, acute, upper 

 gradually smaller ; spike densely many-flowered ; lip {yellow) ovate, crenukUe or 

 somewhat wavy, longer than the broad-ovate, obtuse sepals, shorter than the sub- 

 ulate spur. — Swamps, in pine barrens, N. J. to Ga. and La. Et. of thickened 

 fibres. «St. 12 to 15' high, with Ivs. nearly as long as the internodes. Spike 

 globular or oblong, with 30 to BO small, orange-colored fls. Sep. about 1" long, 

 spur nearly 3", lip 2". Jn., JL (0. flava and nigra Nutt.) 



4. PLATAN'THERA, Richard. Orchis.' (Gr. TrAariif, broad, av(97/pa, 

 anther.) Anther cells diverging below, and the two glands to which 

 the pedicellate pollinia are attached widely separated. Otherwise as in 

 Orchis. (Platanthcra and Gymnadenia are sepat-ated from Orchis by 

 characters purely artificial, and should bo reunited with it.) 



* Leaf only ono. Flowers grcenifih-white. Lip entire or 8-lobc<l Nos. 1,2 



* Leaves only two, roundish, laiso. Flowers pi-eenish. Lip entire Nos. 3, 4 



* Leaves several, clothing the stem more or loss, (a) 



a Lip undivided and entiri?, neither fringed, lolJCfl|por tootlied, whitish Nos. 5, 6 



a Lip undivided,— but 3-toothed, not fringed. Flowers yellowish Nos. 7, 8 



— but fi-in£:ed. Flowers bright yellow or white Nos. 9 — 11 



a Lip 3-pBrte.l, — sci^'ments fringed. Flowers white or greenish Nos. 12, 13 



— se^'Qients fringed. Flowers purple Nos. 14, 16 



— segments merely toothed, terminal ono 2-lobed. Fls. purple No. 16 



— segments entire, long, linear-setaceous. Whitish Nos. 17, 1** 



1 P. obtusata Lindl. Lf. solitary, oblong-obovate, obtuse ; st. bearing the leaf 

 near its base ; spike loose ; upper sep. broade.st ; pet. subtriangular ; lip linear, 

 entire, with 2 tubercles at base, as long as the arcuate, acute spur. — Found in 

 muddy ponds and ditches, N. PI. (Stores), N. to Lab. Stem slender, angular, 

 G — 8' high, terminating in a thin spike of about a dozen smaU, greenish- white 

 flowers. Leaf tapering at base, usually obtuse at the summit, 2 — 3' in length, 

 and 1 in breadth, issuing with the stem from 2 — 3 radical, sheathmg bracts. July. 



2 P. rotundifdlia LindL Lf solitary, roundish-ovate ; scape naked ; spike few- 

 flowered ; hr.icts obtuse, shorter than the ovary ; sep. and pet. obtuse ; lip 3-lobed, 

 lateral lobes svhfalcale, middle one obcordate ; spur as long as the Hp. — Ct., Penn. 

 (Eaton), Can. Scape near a foot high, slender, without a bract Leaf 2 — 4' long, 

 J as wide, spotted, sheathing at base. Flowers about a dozen, of a greenish- 

 white, remarkable for their broad, 3 (almost 4)-lobed, pendent hp. (0. rotund. Ph.) 



3 P. orbiculata LindL Lvs. 2, radical, suborbieular, rather fleshy ; scape bracto- 

 ate; wpper sep. orbicular, lateral ones ovate ; lip linear-subspatulate, nearly twice as 

 long as the sepals ; spur arcuate, compressed, clavate, twice as long as the ovary. 

 — A remarkable plant, not uncommon in old woods and in thickets, Penn. to 

 Can. and W. States. Loaves lying flat upon the ground, 3 — 6' diam., rather in- 

 clining to oval or ovate with the apex acute. Scape 1 — 2f high, sheathed with a 

 few bracts, bearing a raceme of numerous, greenish-white flowers. Lip 9 to 12" 

 by 1" or narrower. Spur 1^ — 2' long. JL (0. orbiculata Ph.) 



4 P. Hookeri LindL Lvs. 2, radical, suborbieular or suboval, fleshy; scape 

 naked; bracts lanceolate, noarlyas long as the flowers; vpper sepal ovafe, erecl. 

 lateral ones deflexed and meeting behind; pet. acute, lip lanceolate, projecting, 

 acuminate, a little longer than the sepals ; spur subulate, arcuate, about twice 

 longer than tlie ovary. — 'Woods, Can., iS. Eng. to Wis. (Lapham), rare. Resem- 

 bles 0. orbiculata, but is very distinct. Scape 8 — 12' high, without a bract be- 

 low the flowers. Loaves 4 — 5' long, nearly or quite as v/ide. Flowers 12 — 18, 



