

14 ANALYTICAL KEY 



n. Flowers appearing before the leaves; the same root producing 

 several to many shoots. 



SAND CHEKRY, PRUNUS PUMILA (p. 80). 

 1. Stamens more than twenty; carpels two .to five. 

 m. Leaves palmately veined. 



NINE-BARK, PHYSOCARPUS OPULIFOLIUS (p. 76). 

 m. Leaves pinnately veined. 



n. Flowers cymose. CHOKEBERRY, PYRTTS ARBUTIFOLIA (p. 77). 

 n. Flowers racemose. 



SERVICEBERRY, AMELANCHIER CANADENSIS (p. 77). 

 a. HERBS. 



b. Fern-like or rush-like plants without seeds or true flowers. 

 c. Spores borne on brownish stems, the green organs borne on separate stems, 

 appearing later. FIELD HORSETAIL, EQUISETUM ARVENSE (p. 30). 



c. Spores and foliage organs not borne on separate stems (Osmunda). 

 d. Spores borne on separate leaves, which arise from the same stem as the 

 green leaves. CINNAMON FERN, OSMUNDA CINNAMOMEA (p. 29). 



d. Spores borne on special portions of leaves which otherwise are green. 

 e. Spore-bearing portion terminal. 



ROYAL FERN, OSMUNDA REGALIS (p. 29). 

 e. Spore-bearing portion median. 



INTERRUPTED FERN, OSMUNDA CLAYTONIANA (p. 29). 

 b. Plants with true flowers and seeds. 



c. Stems with vascular bundles scattered irregularly throughout (as seen in 

 cross section) without a vascular ring between two areas without bundles, 

 viz., the pith and bark; leaves unless long and narrow with two or more 

 primary veins (except in Symplocarpus), which are approximately parallel, 

 or at least not divergent above (except in Trillium and Arisaema); smaller 

 veins not conspicuously reticulated (except in Trillium, Arisaema, and Sym- 

 plocarpus) ; floral parts in threes or sixes (except in Maianthemum and 

 Symplocarpus, where they are in fours, in Arisaema, where the perianth 

 is wanting, and in Sparganium, where the perianth number varies.) 

 (Monocotyledons.) (p. 16.) 



d. Flowers in dense heads or spikes; perianth inconspicuous. 

 e. Flowers in heads, not enclosed in a spathe. 



BUR REED, SPARGANIUM EURYCARPUM (p. 32). 



e. Flowers in spike (spadix) ; if in head, enclosed in a spathe. (Araceae.) 

 f. Spadix freely exposed, not enclosed in a spathe. 



SWEET FLAG, ACORUS CALAMUS (p. 34). 

 f. Spadix enclosed in a spathe. 



g. Spadix cylindric or club-shaped, the upper portion flowerless; flowers 

 imperfect, appearing with the leaves. 



JACK-IN-THE-PULPIT, ARISAEMA TRIPHYLLUM (p. 33). 

 g. Spadix globose, flower-bearing to the summit; flowers perfect, appearing 

 before the leaves. 



SKUNK CABBAGE, SYMPLOCARPUS FOETIDUS (p. 33). 

 d. Flowers not in dense heads or spikes; perianth commonly showy. 

 e. Floral parts in fours. 



WILD LILY-OF-THE-VALLEY, MAIANTHEMUM CANADENSE (p. 37). 

 e. Floral parts in threes or sixes. 



f. Perianth distinctly differentiated in color into a calyx and corolla (p. 15). 

 g. Leaves linear to lanceolate, not whorled. 



SPIDERWORT, TRADESCANTIA VIRGINICA (p. 34). 



