ORDER 138. ORCHID ACFLE. 683 



2 G. tridentata LindL St. slender ; lowest leaf linear-oblong or oblanceolate, ob- 

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

 open spike ; sep. obtuse, rect-spreading ; Up a little longer, truncate and 3-toothed 

 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 18' 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. CLAVBLLATA has the fls. more diverging and the spur conspicuously club- 

 shaped. South. 



3 G. flava Lindl. St. flexuous, leafy ; lower hs. narrow-lanceolate, acute, upper 

 gradually smaller ; spike densely 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, X. J. to Ga. and La. Rt. of thickened 

 fibres. St. 12 to 15' high, with Ivs. nearly as long aa 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 Xutt) 



4. PLATAN'THERA, Richard. ORCHIS. (Gr. aAarv?, broad, dvdfjpd, 

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

 the pedicellate pollinia are attached widely separated. Otherwise as in 

 Orchis. (Platanthera 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-lobe<l .................. Nos. 1, 2 



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



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



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



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



but fringed. Flowers bright yellow or white ......... . . .Nos. 9 11 



a Lip 3-parted, segments fringed. Flowers white or greenish ................ Nos. 12, 13 



segments fringed. Flowers purple .......................... Nos. 14, 15 



segments merely toothed, terminal one 2-lobed. Fls. purple ...... No. 1C 



segments entire, long, linear-setaceous. Whitish ........... Nos. 17, IS 



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

 near its base; spike loose: upper sep. broadest; pet. subtriangular ; lip linear. 

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

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

 G 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' in length. 

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



2 P. rotundifolia Lindl. Lf. solitary, roundish-ovate ; scape naked ; spike few- 

 flowered ; bracts obtuse, shorter than the ovary ; sep. and pet. obtuse ; lip B-loled, 

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

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

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

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



3 P. orbiculata Lindl. Lvs. 2, radical, suborbicular, rather fleshy ; scape bracte- 

 a*e; upper sep, orbicular, lateral ones avate ; 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, PenntHo 

 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, 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, suborbicular or suboval, fleshy; scape 

 naked ; bracts lanceolate, nearly as long as the flowers ; upper tepal 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. Woods, Can., N. Eng. to Wis. (Lapham), rare. Resem- 

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

 low the flowers. Leaves 4 5' long, nearly or quite as wide. Flowers 12 IS, 



