benaria blephariglottis.=

PIPERACEAE, 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.

1a. Leaves less than twice as long as broad, on petioles 3 cm. long or
more --2.

1b. 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.

9a. Petioles without glands --10.

9b. Petioles with glands --11.

10a. Petiole short (about 5 mm.), broad and flat
=Black Willow, Salix nigra.=

10b. Petiole slender, about 10-20 mm. long
=Peach-leaved Willow, Salix amygdaloides.=

11a. Leaves green beneath
=Crack Willow, Salix fragilis.=

11b. Leaves pale beneath --12.

12a. Branches and twigs conspicuously drooping
=Weeping Willow, Salix babylonica.=

12b. Branches and twigs not conspicuously drooping, yellow