22a. Stamens projecting beyond the calyx 



Alum Root, Heuchera hirsuticaulis. 

 22b. Stamens not projecting beyond the calyx 



Alum Boot, Heuchera hispida. 

 23a. Stem-leaves alternate or none 24. 

 23b. Stem with a pair of opposite leaves (2 4 dm. high) 



Bishop's Cap, Mitella diphylla. 

 24a. Petals deeply fringed (12 dm. high) 



Bishop's Cap, Mitella nuda. 

 24b. Petals entire (13 dm. high) 



False Mitrewort, Tiarella cordifolia. 



HAMAMELIDACEAE, the Witch Hazel Family 



Shrubs, with alternate simple leaves; sepals, petals, and stamens 

 each 4; ovary 2-lobed. 



One species in Michigan; tall shrub with obovate leaves and yel- 

 low flowers appearing late in autumn 



Witch Hazel, Hamamelis virginiana. 



PLATANACEAE, the Plane Tree Family 



Trees, with broad, palmately veined and lobed leaves, and mi- 

 nute flowers in dense spherical heads. 



One species in Michigan Sycamore, Platanus occidentalis. 



BOSACEAE, the Eose Family 



Trees, herbs, or -shrubs, with alternate, frequently compound 

 leaves; petals and sepals usually 5, stamens numerous, pistils 1 to 

 many; receptacle expanded into a saucer-shape or cup-shape organ, 

 bearing the sepals, petals, and stamens at its margin, the pistils at its 

 center, and resembling a calyx-tube or flattened calyx. 



la. Shrubs or trees 2. 

 Ib. Herbaceous plants 48. 



2a. Leaves compound 3. 

 2b. Leaves simple 24. 



3a. Flowers in large panicles or corymbs, each flower 5 10 mm. 



across; leaflets 7 or more 4. 

 3b. Flowers solitary or in small clusters, each flower usually 20 80 



mm. wide; leaflets frequently only 3 or 5 7. 



4a. Flowers in a pyramidal or oblong panicle, the ovaries su- 

 perior (1 2 m. high; flowers white, in summer) 70b. 



4b. Flowers .in rounded or hemispheric clusters, the ovary in- 

 ferior 5. 



