TAXACEAE, the Yew Family 



Shrubs, with needle-like evergreen leaves; fruit red and berry- 

 like. 



One species in Michigan; straggling shrub 1 3 m. high 



Ground Hemlock, Taxtis canadensis. 



TYPHACEAE, the Cat-tail Family 



Erect plants 1 2 m. high, with linear leaves and terminal spikes 

 of brown flowers, appearing in summer. 



la. Staminate and pistillate portions of the flower-spike contiguous, 

 the latter 2.5 cm. in diameter Common Cat-tail, Typlia latifolia, 



Ib. Staminate and pistillate portions of the spike separated, the lat- 

 ter 2 cm. or less in diameter 



Narrow-leayed Cat-tail, Typha angustifolia. 



SPARGANIACEAE, the Bur-reed Family 



Marsh plants with linear leaves and spherical heads of incon- 

 spicuous greenish flowers, appearing in summer. 



About 5 species occur in Michigan, of which the commonest is 



Bur-reed, Sparganium eurycarpum 



NAJADACEAE, the Pondweed Family 



Aquatic plants with submerged or floating leaves and inconspicu- 

 ous flowers in summer. 



la. Leaves opposite or whorled 2. 

 Ib. Leaves alternate 2c. 



2a. Leaves thread-like, 3 8 cm. long 



Horned Pondweed, Zannichellia palustris. 



2b. Leaves linear, toothed, abruptly dilated at the base, 3cm. 



long or less (Naiad) 3. 

 2c. Leaves entire, not abruptly dilated at base 



*Pondweed, Potaniogeton spp. 

 3a. Leaves about 2 mm. wide, sharply and coarsely toothed 



Naiad, Naias marina. 

 3b. Leaves very narrowly linear, with numerous minute teeth 



Naiad, Naias flexilis. 



* About 30 species of Potamogeton occur in Michigan, among which the most 

 conspicuous is Potamogeton natans, with elliptical floating leaves. For the identifica- 

 tion of the species the Manual must be used. 



