20 



A FIELD GUIDE IN NATURE-STUDY 



Sweet Cicely 



bb Several times compounded making a lacy leaf 

 c Leaf when crushed with odor of licorice 

 cc Leaf without odor of licorice when crushed 

 d Flowers white, rose, or purplish 



e Flower clusters concave or bird-nest- 

 like Wild Carrot, Bird's Nest, or Queen Anne's Lace 

 ee Flower clusters not concave 



/ Stem smooth and striped with 



purple 



ff Stem grooved 

 dd Flowers yellow 



e Flower clusters concave 

 ee Flower clusters not concave 

 / Stem smooth 

 ff Stem grooved 

 ILL. Twining and climbing weeds 

 a Leafy 



b With cordlike or ropelike underground stems 

 c Flowers morning-glory-like; an inch across 

 cc Flowers morning-glory-alike; considerably 



more than an inch 



bb With very large fleshy roots and morning-glory- 

 like blossoms 



bbb With ordinary fibrous roots; flowers incon- 

 spicuous 



aa Leafless-stem orange, like string, twisted about 

 supporting plants upon which it is parasitic 



IV. Weeds that lie low and form dense mats or rosettes on 

 the ground 

 a Plants matted rather than in rosettes 



b Leaves thick and succulent Wild Portulaca Purslane 



bb Leaves round or kidney-shaped, wavy margins 

 c Flowers purple 



cc Flowers pink, fruit button-shaped 

 bbb Leaves whorled (Fig. 3^) 



c Stem harsh and roughened with prickers 

 cc Stem not prickly; greenish white, star- 

 shaped flowers 



bbbb Leaves not succulent, round, or whorled 

 c Stems swollen at nodes 

 cc Stems not swollen at nodes 



d Spiny bracts at base of leaves, root 



pink 

 dd No spiny bracts; flower greenish- white 



Water Hemlock 

 Cow Parsnip 



Wild Carrot 



Meadow Parsnip 

 Water Parsnip 



Field Bindweed 



Hedge Bindweed 



Wild Sweet Potato 



Black Bindweed 



Dodder 



Ground Ivy 

 Cheeseweed 



Bed Straw 



Indian Chickweed 



Knotweed 



Low Amaranth 

 Common Chickweed 



