ANALYTICAL KEY 



o. Leaves not opposite. 



p. Upper leaves colored scarlet or yellow; stem leaves merely 

 cleft. PAINTED CUP, CASTILLEJA COCCINEA (p. 114). 



p. Upper leaves green; leaves pinnatifid. 



LOUSEWORT, PEDICTTLARIS CANADENSIS (p. 114). 

 g. Flowers epigynous. 



h. Flowers not grouped in dense heads, 

 i. Leaves whorled; stem weak, bristly. 



BEDSTRAW, GALIUM APARINE (p. 116). 

 i. Leaves opposite, not whorled. 



j. Delicate plants without connate leaves (Houstonia). 

 k. Corolla salver-form; peduncles one-flowered. 



BLUETS, HOUSTONIA CAERULEA (p. 116). 

 k. Corolla funnel-form; peduncles more than one-flowered. 



HOUSTONIA PURPUREA (p. 117). 

 j. Coarse plant; some leaves connate. 



HORSE GENTIAN, TRIOSTEUM PERFOLIATUM (p. 118). 

 h. Flowers grouped in dense heads (Compositae) ; calyx where present 



represented by pappus. 

 i. Juice not milky. 



j. Heads radiate (i. e., with ray flowers). 



k. Rays flesh color to purplish, numerous; pappus capillary (Erigeron). 

 1. Plants with basal offsets; stem simple, not very leafy; heads large, 

 few; rays about fifty. ERIGERON PULCHELLUS (p. 120). 



1. Basal offsets none; stem corymbed, leafy; heads smallish, numer- 

 ous; rays many more than fifty. 



ERIGERON PHILADELPHICUS (p. 121). 

 k. Rays white; pappus none. 

 1. Leaves compound, much dissected; heads small. 



YARROW, ACHILLEA MILLEFOLITTM (p. 122). 

 1. Leaves simple, though sometimes pinnatifid; heads large. 



OX-EYE DAISY, CHRYSANTHEMUM LEUCANTHEMUM (p. 123). 

 k. Rays yellow. 



1. Leaves opposite; receptacle flat, chaffy; pappus two small teeth 

 or none; rays few, lobed. COREOPSIS LANCEOLATA (p. 122). 

 1. Leaves not opposite. 

 m. Receptacle conical, chaffy; pappus none; plant rough hairy. 



BLACK-EYED SUSAN, RTIDBECKIA HIRTA (p. 121). 

 m. Receptacle flat, not chaffy; pappus capillary; plant smoothish. 



GOLDEN RAGWORT, SENECIO ATJREUS (p. 123). 



j. Heads discoid (t. e., without ray flowers) ; dioecious plants with 

 entire white-woolly leaves. EVERLASTING, ANTENNARIA (p. 121). 

 i. Juice milky; flowers yellow. 

 j. Pappus of both scales and bristles (Krigia). 

 k. Annual; scales and bristles less than ten. 



DWARF DANDELION, KRIGIA VIRGINICA (p. 124). 

 k. Perennial; scales and bristles ten or more; stem leaves clasping. 

 KRIGIA AMPLEXICATJLIS (p. 124). 

 j. Pappus all capillary; leaves radical, pinnatifid; achenes beaked. 



DANDELION, TARAXACUM OFFICINALE (p. 125). 



