554 



ORCHIDACEAE. 



Vol. I. 



8. LIMNORCHIS Rydb. Mem. N. Y. Bot. Gard. i : 104. 1900. 



Leafy plants with thick fleshy roots and small greenish or whitish flowers in a long spike. 

 Sepals and petals free and spreading. Lip entire. Beak of the stigma without appendages. 

 Anther-sacs nearly parallel, wholly adnate. Glands naked. Pollinia granular. [Greek, marsh- 

 orchis.] 



A North American genus of about is species, differing from Lysias in the general habit and 

 the almost parallel anther-sacs. Type species: Limnorchis hyperborea (L.) Rydb. 

 Flowers greenish; base of the lip little dilated. i. L. hyperborea. 



Flowers white ; base of the lip much dilated. 2. L. dilatata. 



i. Limnorchis hyperborea (L.) Rydb. Tall Leafy Green Orchis. Fig. 1367. 



Orchis hyperborea L. Mant. 121. 1767. 



Habenaria hyperborea R. Br. in Ait. Hort. Kew. Ed. 2, 



5: 193. 1813. 

 Orchis huronensis Nutt. Gen. 2: 189. 181 8. 

 Limnorchis huronensis Rydb. in Britton, Man. 294, 1901. 



Stem rather stout, 8-3 high. Leaves lanceolate, 

 mostly acute, 2'-i2' long, 6"-i8" wide; spike narrow, 

 3'-8' long ; flowers small, greenish or greenish yel- 

 low; sepals and petals ovate, obtuse, 2"-$" long; 

 upper sepal slightly crenulate at the apex ; lip lanceo- 

 late, entire, obtuse, about 3" long; spur about equal- 

 ling the lip, shorter than the ovary, blunt, slightly 

 incurved, sometimes clavate; anther-sacs parallel, 

 diverging at the base; glands small; ovary more or 

 less twisted. 



In bogs and wet woods, Greenland to Alaska, New Jer- 

 sey, Colorado and Oregon, Iceland. Northern green 

 orchis. May-Aug. 



L. media Rydb. is probably a hybrid of this species and 

 the next. L. major (Lange) Rydb. is, apparently, re- 

 stricted to Greenland. 



2. Limnorchis dilatata (Pursh) Rydb. Tall White Bog Orchis. Fig. 1368. 



Orchis dilatata Pursh, Fl. Am. Sept. 588. 1814. 

 Habenaria dilatata Hook. Exot. Fl. 2 : pi. 95. 1825. 

 L. fragrans Rydb. in Britton, Man. 294. 1901. 

 L. dilatata Rydb. in Britton, Man. 294. 1901. 



Stem slender, leafy, i°-2° high. Leaves lanceo- 

 late, 3'-i2' long, 4"-io" wide, obtuse or acute; spike 

 2'-io' long; bracts acute, the lower longer than the 

 ovary, the upper shorter; flowers small, white, some- 

 times fragrant; sepals ovate to lanceolate, nearly 3" 

 long; petals acute, lanceolate; lip entire, dilated or 

 obtusely 3-lobed at the base, obtuse at the apex, 

 about as long as the blunt incurved spur; anther- 

 sacs nearly parallel; glands close together, strap- 

 shaped, nearly as long as the pollinia and caudicle; 

 stigma with a trowel-shaped beak between the bases 

 of the anther-sacs. • 



In bogs and wet woods, Nova Scotia to Alaska, south to 

 Maine, New York and Oregon. Northern white orchis. 

 June-Sept. Consists of several races, differing in the 

 shape of the sepals and petals and width of leaves. 



Limnorchis graminifolia Rydb. of the northwest, with much narrower leaves, is recorded 

 from Quebec. 



9. PIPERIA Rydb. Bull. Torr. Club 28: 269. 1901. 



Herbs resembling Limnorchis in habit, but with short rounded tubers. Leaves mainly 

 near the base of the stem, early withering. Spike strict. Flowers white, greenish, purplish 

 or yellowish. Sepals i-nerved, the lateral ones adnate to the claw of the lip. Petals 

 i-nerved. Lip with a median ridge, truncate or hastate at the base. Anther-sacs opening 

 laterally. [Dedicated to Professor C. V. Piper, of Washington.] 



