Illustrations xv 



PLATE FACING PAGE 



13 Orchis rottmdifolia Pursh. Small 



Round-Leaved Orchid . ;' . 58 



14 Limnorchis dilatatiformis Rydb. 



Purplish-Green Bog-Orchid . . 62 



14 Peramium Menziesii (Lindl.) Morong. 



Menzies' Rattlesnake Plantain . .62 



15 Ophrys borealis (Morong). Northern 



Twayblade . . . . .64 



15 Ophrys nephrophylla Rydb. Heart- 



Shaped Twayblade . . .64 



15 Cceloglossum bracteatum (Willd) 



Parl. Long-Bracted Orchid . . 64 



1 5 Limnorchis fragrans Rydb. Fragrant 



White Bog-Orchid . . .64 



15 Lysiella obtusata (Pursh) Rydb. 



Small Northern Bog-Orchid . . 64 



1 6 ComandrapallidaDC. White Coman- 



dra . 74 



1 6 Eriogonum subalpinum Greene. Tall 



White Eriogonum . ' . . 74 



17 Claytonia lanceolata Pursh. Spring 



Beauty ..... 80 



17 Claytonia parvifolia Moc. Small- 



Leaved Spring Beauty ... 80 



1 8 Silene acaulis L. Moss Campion -. 82 

 1 8 Lychnis apetala L. Nodding Lychnis 82 



