Oedeb 138.— ORCHID ACEM. 683 



2 G. tridentata Lindl. St. slender ; bluest leaf linear-oblong or eblanceolale, ob- 

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

 open spike; sep. obtuse, erect-spreading; lip a little longer, truncate and 3-ioolhed 

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

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

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

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

 tridentata Willd.) 



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

 shaped. — South- 



3 G. flava Liuefl. St. flexuous, leafy ; lower lis. narrow-lanceolate, acute, upper 

 gradually smaller ; spike dens< ly many-flowered ; lip (yellow) ovate, crenulate 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. RL of thickened 

 fibres. St. 12 to 15' high, with 1 vs. nearly as long as the internodes. Spike 

 globular or oblong, with 30 to 50 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. -rrXarvg, broad, dv6r,pd, 

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

 the pedicellate pollinia are attached widely separated. Otherwise as in 

 Orchis. (Platauthera and Gymnadenia are separated from Orchis by 

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



* Leaf only one. Flowers greenish-white. Lip entire or 3-lobed Nos. 1, 2 



* Leaves only two. roundish, large. Flowers greenish. Lip entire Nos. 3, 4 



* Leaves several, clothing tlie stem mora or less, (a) 



a Lip undivided and entire, neither fringed, lobed, nor toothed, whitish Nos. 5, 6 



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



— bat fringed. Flowers bright yellow or white Nos. 9— 11 



a Lip 8-ported,— segments fringed Flowers white or greenish Nos. 12, 13 



— segments fringed. Flowers purple i\os. 14, 15 



— segments merely toothed, terminal one 2-lohed. Fls. purple No. 16 



— segments entire, long, linear-setaceous. Whitish Nos. IT, IS 



1 P. o"btuse.ta Lindl. Lf. solitary, oblong-obovate, obtuse; st. bearing the leaf 

 near its base; tpike loose; upper sep. broadest; pet sub triangular ; lip linear, 

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

 muddy ponds and ditches, K II. (Storrs), N. to Lab. Stem slender, angular, 

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

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

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



2 P. rotundifelia LindL Lf. solitaty, roundish-ovato ; scape naked ; spike few- 

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

 lateral lobes subfakate, middle one obcordate ; spur as long as the lip. — Ct., Penn. 

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

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

 white, remarkable for their broad, 3 ( dmosl 4j-lobed, pendent lip. (0. rotund. Ph.) 



3 P. orbiculata Lindl. Lvs. 2, radical, suborbicular, rathe r fleshy ; scape bracts- 

 ate; upper sep . orbicular, lateral outs 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. Leaves 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, beating a raceme of numerous, greenish-white flowers. Lip 3 to 12" 

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



4 P., Hookeri Lindl. Lvs. 2, radical, suborbicular or euboval, fleshy ; scape 

 naked; bracts lanceolate, nearly as long as the flowers ; upper sepal ovate, erect, 

 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 the ovary. — "vToods, Can., N. Eng. to "Wis. (Lapham), rare. Resem- 

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

 low the flowers. Leaves 4-^-5' long, nearly or quite as wide. Flowers 12 — 18. 



