ORCHIDACEAE 95 



4. Gyrostachys cernua (L,. ) Kuntze. Nodding Ladies' Tresses. 

 (Man. p. 300; I. F. f. 112J.) In wet meadows and swamps, N. S. to 

 Minn., Fla. and La. — Pennsylvania : Monroe ; Luzerne ; Northamp- 

 ton ; Lancaster ; York ; Franklin ; Huntingdon ; Lebanon ; 

 Armstrong ; Erie, Presque Isle ; Montgomery ; Delaware, Tini- 

 cum; Chester ; Fayette ; Allegheny. 



5. Gyrostachys plantaginea (Raf. ) Britton. Wide-lEaved Ladies' 

 Tresses. (Man. p. 300; I. F.y". 1122.) Moist banks and woods, N. B. 

 to Minn., Va. and Mich. — Pennsylvania : Northampton ; Lancaster ; 

 Franklin. 



6. Gyrostachys stricta Rydb. Hooded Ladies' Tresses. (Man. 

 p. 299; I. F.y. 1121.) In bogs, Newf. to Idaho, Me., Pa., Minn, and 

 Colo. — Pennsylvania : Erie, Presque Isle ; Crawford, Hammarley. 



10. LISTER A R. Br. 



Column very short, 0.5 mm. long or less : lip linear or nearly so. 



Lip with lateral teeth : rachis and pedicels glabrous. i. L. cordala. 



Lip without lateral teeth : rachis and pedicels glandular. 2. L. australis. 

 Column relatively long, 1.5 mm. long : lip wedge-shaped. 3. L. Smallii. 



1. Listera cordata (L. ) R. Br. He.a.rt-leaved Twayblade. 

 (Man. p. 301 ; I. V.f. ii2g.) In moist woods, N. S. to Alaska, N. J. and 

 Oregon. — Pennsylvania : Wayne, Mt. Pleasant ; Centre. 



2. Listera australis Lindl. Southern Twayblade. (Man. p. 302 ; 

 I. F. /. /fjo.) In bogs, N. Y. and N. J. to Fla. and La. — Pennsylvania : 

 ChE-STEr, N. Valley hills. 



3. Listera Smallei Wiegand. Sm.\ll's Twayblade. (Man. p. 301 ; 

 I. F.y". ii2Sa. ) In damp wo; dsin the mts. from Pa. to N. C. and Tenu. 

 — Petinsylvania : Somerset. 



11. PERAMIUM Salisb. 



Spike one-sided, somewhat spirally twisted : lip ending in an oblong recurved 

 tip: stigma 2-toothed. i. P. ophioides. 



Spike cylindric : tip ending in ovate straight tip : stigma entire. 



2. P.pubescens. 



1. Peramium ophioides (Fern aid) Rydb. WhiTE-blotched RaTTlE- 

 SN.\ke PlanT.\in. (Man. p. 302.) In cold, mossy woods. Prince Ed- 

 ward Island to Man. and N. C— Pennsylvania : Huntingdon ; Centre ; 

 Blair. 



2. Peramium pubescens (Willd.) MacM. Downy Rattlesnake 

 Plantain. (Man. p. 302 ; I. F.y. 1132.) In dry woods, Newf. to Minn., 

 Fla. andTenn. — Pennsylvania : Northampton ; Lancaster ; Dauphin, 

 Monroe ; Luzerne ; Lebanon ; Delaware ; Chester ; Franklin ; 

 Huntingdon ; Erie ; Allegheny ; Montgomery ; Centre ; York. 



12. LIMODORUM L. 

 1. Limodorum tuberosum L. Grass-pink Calopogon. (Man. p. 

 298; I. F.y II4S-) In bogs and meadows, Newf. to Minn., Fla. and 



