PLANTS OF SOUTHERN NEW JERSEY. 363 



ee. I,eaves not variegated. 

 /. Flowers not white. 

 g. Leaf single. 



h. At base of scape. Aplectrum hyemale, p. 378 



hh. About the middle of scape. 



Acroanthes unifolia, p. 376 

 gg. Leaves two. 



h. About the middle of scape. 



Listera australis, p. 375 

 hh. At base of scape. 



i. Flowers yellowish green. 



Leptorchis Iceselii, p. 377 

 n. Flowers brownish purple. L. lUiifoUa, p. 377 

 //. Flowers white, usually in a spirally arranged spike. 



g. Leaves oblong lanceolate, i dm. long by 10 mm. wide, 

 blooming in spring or early summer. 



G. plantaginea, p. 373 

 gg. Leaves long and grass-like, .7-3.5 dm. long, blooming 

 in late summer or autumn. 



h. Flowers in several ranks. G. cernua, p. 373 



hh. Flowers in a single rank. 



i. Scape almost glabrous, 4-7 dm. high. 



G. prcscox, p. 374 

 ii. Scape pubescent above, 1.5-5 dm. high. 



G. vernalis, p. 374 

 ggg. Leaves ovate or elliptic, absent at flowering time- 

 late summer or autumn. 

 h. Plant. 2-6 dm. high, lips of flower green, a cluster 

 of tuber-like roots. G. gracilis, p. 375 



hh. Plant 1.2-2.5 dm. high, lip white, a single tuber- 

 like root. G. beckii, p. 375 



CYPRIPEDIUM L. 

 Cypripedium acaule Ait. Moccasin Flower. 

 PI. XLII. 

 Cypripedium acaule Alton, Hort. Kew. 111:303. 1789 [North America]. — 

 Knieskern 31. — -Willis 62. — Rafinesque Med. Fl. 1 : 144. 1828. — Britton 

 236. — Keller and Brown 107. 

 Cypripedium humile Barton PI. Phila. II : 145. 1818. 



Sandy woods throughout the State ; frequent. 

 Pi. — Early May to early June. 



Middle District. — Farmingdale, New Egypt, Arney's Mt. (S), Camden, 

 Westville, Washington Park, Orchard (S), Medford (S),^ Swedesboro, 

 Bridgeton (S). 



Pine Barrens. — Manahawkin, Speedwell (S), Jackson, Cedar Brook, Wil- 

 liamstown Jnc. (S), Landisville, Pleasant Mills, Egg Harbor City, Beesley's 

 Pt. (S), Tuckahoe. 



Cape May. — Dennisville, Cold Spring, Cape May (OHB). 



