The Plants of Michigan - LightNovelsOnl.com
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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 =Yellow Willow, Salix alba var. vitellina.=
13a. Shrubs of bogs --14.
13b. Plants of sand-dunes along the Great Lakes --15.
13c. Plants of dry upland hills --16.
13d. Plants of wet ground, river-banks, and swamps --17.
14a. Leaves densely white-tomentose beneath =Willow, Salix candida.=
14b. Leaves pale beneath but not tomentose =Willow, Salix serissima.=
14c. Leaves glabrous and green beneath =Willow, Salix pedicellaris.=
15a. Leaves linear =Willow, Salix longifolia.=
15b. Leaves ovate-lanceolate, tomentose beneath =Willow, Salix syrticola.=
15c. Leaves ovate-lanceolate, glabrous =Willow, Salix glaucophylla.=
16a. Leaves about 3 times as long as broad =Willow, Salix rostrata.=
16b. Leaves narrower, nearly sessile =Willow, Salix tristis.=
16c. Leaves narrower, distinctly petioled =Willow, Salix humilis.=
17a. Leaves linear or nearly so =Willow, Salix longifolia.=
17b. Leaves s.h.i.+ning =Willow, Salix lucida.=
17c. Leaves silky =Willow, Salix sericea.=
17d. Leaves not as in the preceding 3 species --18.
18a. Leaves rounded at base =Willow, Salix cordata.=
18b. Leaves acute at base --19.
19a. Leaves finely serrulate =Willow, Salix petiolaris.=
19b. Leaves remotely serrate or nearly entire =Willow, Salix discolor.=
MYRICACEAE, the Sweet Gale Family
Shrubs, with monoecious or dioecious flowers in catkins, and aromatic foliage.
1a. Leaves pinnately lobed =Sweet Fern, Myrica asplenifolia.=
1b. Leaves merely serrate --2.
2a. Shrub of sandy soil, sh.o.r.e of Lake Erie =Bayberry, Myrica carolinensis.=
2b. Shrub of bogs and sh.o.r.es, northern half of state =Sweet Gale, Myrica gale.=
JUGLANDACEAE, the Walnut Family
Trees with alternate pinnately compound leaves and flowers in catkins.
1a. Leaflets 11-23; pith divided by part.i.tions into chambers --2.
1b. Leaflets 5-11; pith not part.i.tioned (Hickory) --3.
2a. Pith brown; bark with flat longitudinal ridges =b.u.t.ternut, Juglans cinerea.=
2b. Pith cream-color; bark of trunk without flat ridges =Black Walnut, Juglans nigra.=
3a. Bark of the trunk essentially smooth, not deeply furrowed or s.h.a.ggy --4.
3b. Bark of the trunk deeply furrowed or s.h.a.ggy --6.
4a. Leaflets glabrous beneath; buds greenish --5.
4b. Leaflets somewhat p.u.b.escent beneath; buds bright yellow =Bitter Nut, Carya cordiformis.=
5a. Twigs hairy =Small-fruited Hickory, Carya microcarpa.=
5b. Twigs smooth =Pignut Hickory, Carya glabra.=
6a. Twigs and leaves both p.u.b.escent --7.
6b. Twigs nearly smooth; leaves smooth beneath =s.h.a.g-bark Hickory, Carya ovata.=
