72 NEW YORK STAT!-; MUSEUM 



The Tall White Bog Orchis (Limnorchis dilatata (Pursh) 

 Rydberg) is usually more slender, with small white flowers; the ovate or 

 lanceolate sepals nearly one-fourth of an inch long; petals lanceolate, 

 pointed ; lip entire, dilated or obtusely three-lobed at the base, blunt at 

 the apex, about as long as the blunt and incurved spur. In similar situa- 

 tions, but southward only to Maine and New York. 



Large Round-leaved Orchis 



Lysias orbiculata (Pursh) Rydberg 



Plate 35 and Figure VIII 



Flowering scape rather stout, i to 2 feet high, with a few inconspicuous 

 bracts, and at the base, spreading flat on the ground, two large orbicular 

 or orbicular-elliptical, dark-green, shining leaves, silvery beneath, 4 to 8 

 inches in diameter. Flowers forming a loose raceme, each flower on a 

 pedicel about one-half of an inch long, erect in fruit, greenish white; upper 

 sepal short and rounded; lateral sepals spreading, falcate-ovate and blunt; 

 one-third to one-half of an inch long; petals smaller and narrower; lip entire, 

 oblong-linear, blunt, white, about one-half of an inch long; spur longer 

 than the ovary, about \\ to 2 inches long. 



In rich woods, Newfoundland to Minnesota, south to Pennsylvania. 

 Flowering in June and July. 



Plate 35 shows the flowers after they have begun to fade. The detail 

 of the flowers is shown better in figure VIII. OakesAmes regards the loose- 

 flowered form with long spurs as Habenaria macrophylla 

 Goldie, and restricts Lysias orbiculata to the form with dense 

 inflorescence and spurs 1 to if inches long. 



Hooker's Orchis 



Lysias hookeriana (A. Gray) Rydberg 



Plate 36 



Stem or flowering scape 8 to 15 inches high, stout, smooth, without 

 bracts, but with two fleshy, shining, dark-green, oval-orbicular or obovate, 

 spreading or ascending leaves at the base, 3 to 6 inches long, rarely flat on 

 the ground. Flowers in a rather loose raceme, 4 to 8 inches long, yellowish 



