A GUIDE TO THE WILD FLOWERS 241 



741. Horse Balm. Collinsonia canadensis. An erect, branched /^N 

 perennial, 2-5 ft. high. Leaves oval, or oblong-oval, short- K^ 

 stalked, sharply toothed, 6-10 in. long. Flowers yellow, in a 

 large loose open few-flowered cluster, that may be i ft. long. 

 Corolla very irregular, one of its lobes larger than the others 



and fringed. In rich woods. Quebec and Ontario to Florida, 

 and westward. July-September. Fig. 741. 



742. Giant Hyssop. Agastache nepctoides. A smooth stout 

 perennial 2-5 ft. high, usually branched towards the top. 

 Leaves oval, wedge-shaped at the base, pointed at the tip, 

 stalked, 2-6 in. long, and toothed with blunt teeth. Flowers 

 in a dense terminal spike which is 4-15^ in. long, greenish- 

 yellow. Corolla 2-lipped, about Ys in. long. In woods and 

 thickets. Quebec and Vermont to Georgia, and westward. 

 August. Fig. 742. 



743. Flowers neither yellow, nor greenish-yellow. (Mint 

 Family continued.) 



Stem leaves with an obvious and distinct stalk, not merely nar- 

 rowed to a stalk-like base (The two exceptions are Skullcaps, 



nos. 778 and 779) no. 761 



Stem leaves without an obvious and distinct stalk, the leaf stalk- 

 less, or merely narrowed to a stalk-like base. (The only ex- 

 ception is the Rough Hedge Nettle, no. 753) 

 Leaves wholly without marginal teeth (except in the Wild 



Basil, no. 757) no. 755 



Leaves distinctly, but sometimes shallowly toothed (except in 

 the Hyssop Hedge Nettle, no. 751) 

 Flower clusters exclusively, or overwhelmingly terminal, not 



among the upper leaves no. 748 



Flower clusters mostly among the upper leaves, some oc- 

 casionally terminal 



Leaves narrowed at the base American Pennroyal no. 744 

 Leaves broad at the base 



Flower clusters stalked Stone Mint no. 745 



Flower clusters essentially stalkless 



Leaf-teeth obvious Field Basil no. 746 



Leaf-teeth shallow and irregular .... Bugle no. 747 



744. American Pennyroyal. Hcdcotna pulcgioidcs. An 

 annual, weedy, hairy, plant with a much branched stem, 6-15 



