19 



43a. Lip deeply 3-lobed, toothed or fringed 44. 

 43b. Lip not 3-lobed, but deeply fringed 46. 



44a. Flowers purple Purple Fringed Orchis, Habenaria psycodes. 



44b. Flowers white or nearly so 45. 

 45a. Spur 3 cm. long or more 



Prairie Fringed Orchis, Habenaria leucophaea. 

 45b. Spur 1 1.5 cm. long Eagged Fringed Orchis, Habenaria lacera, 



46a. Flowers yellow Yellow Fringed Orchis, Habenaria ciliaris. 

 46b. Flowers white 



White Fringed Orcnis, Habenaria blephariglottis. 



PIPEEACEAE, the Pepper Family 



Herbaceous plants with alternate leaves, and flowers without 

 either calyx or corolla. 



One species in Michigan, a marsh plant with heart-shape leaves 

 and slender racemes of white flowers 



Lizard's Tail, Saururus cernuus. 



SALICACEAE, the Willow Family 



Trees or shrubs, with dioecious flowers in catkins. 



la. Leaves less than twice as long as broad, on petioles 3 cm. long 



or more 2. 

 Ib. Leaves more than twice as long as broad, on petioles 2.5 cm. long 



or less. (The genus Salix, or Willow, contains about 30 species 



in Michigan, of which only the commoner are mentioned here. 



For the others the Manuals should be consulted.) 8. 



2a. Petioles strongly flattened laterally 3, 

 2b. Petioles not flattened laterally 6. 



3a. Leaves broadly ovate or nearly circular 4. 



3b. Leaves broadly triangular or deltoid in shape 5. 



4a. Leaves coarsely toothed 



Large-toothed Aspen, Populus grandidentata. 

 4b. Leaves finely crenulate or serrate 



Quaking Aspen, Populus tremuloides. 

 5a. Tree with narrow spire-shape crown 



Lombardy Poplar, Populus nigra var. italica. 

 5b. Tree with spreading crown Cottonwood, Populus deltoides. 



6a. Lower side of leaf densely tomentose 



White Poplar, Populus alba. 



6b. Lower side of leaf glabrous or nearly so 7. 



7a. Petioles glabrous Balsam Poplar, Populus balsamifera. 



7b. Petioles ciliate Balm of Gilead, Populus candicans. 



8a. Trees 9. 

 8b. Shrubs 13. 



