Obdee 138.— ORCHIDACB^. 683 



2 G. trideutkta Lindl. St. Blender ; lotoesi leaf Unear-ohhng or ohlanceolaie, ob- 

 tuse, the others 3 or 4, very small and bract-like ; fls. 1 to 12, sessile, in a short, 

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

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

 than the ovary. — In damp woods. Can. and XT. S. Boot 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 WiUd.) 



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

 shaped. — South. 



3 G. fl^va Lindl. St. flexuous, leafy ; lotoer Ivs. nairow-lanceolate, acute, upper 

 grqfiually smaller ; spike densely many-flowered ; lip (yeUoui) ovale, cremdate 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. Rt. of thickened 

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

 globular or oblong, with 30 to 50 smaU, 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. TrAar^f , broad, dvdijpd, 

 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 greenisb-white. Lip entire or S-lobed Nos. 1, 2 



* Leaves only two, ruundisli, large. Flowers preenish. Lip entire Bos. 8, 4 



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



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



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



— but fringed. TTlowers bright yellow or white Nos. 9 — 11 



H, Lip S-parted, — segments fringed. Flowcrsswhito or greenish Nos, 12, 13 



— segments fringed. Flowers purple Nos. 14, 15 



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



—segments entire, long, linear-setaceous. "Whitish : Nus. 17, 18 



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

 near its base; epike 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, N. H. (Storrs), N. to Lab. Stem' slender, angular, 

 6 — 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 tlie 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. o'btuse ; lip Globed, 

 lateral hies subfalcate, middle one ohcordaie ; spur as long as the lip. — Ct., Penn. 

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

 I 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 ; seape bracte- 

 ate; upper sep. orbicular, lateral ones ovate; lip linear-subspatulate, nearly twiceas 

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

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

 Can. and W. States. Leaves lying fiat 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 IJ — 2' long. Jl. (0. orbiculata Ph.) 



4 P. Hookeri Lindl. Lvs. 2, radical, suborbicular or subovalj 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 httle 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 — 18, 



