28 ANALYTICAL KEY 



0, 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, PEDICTJLABIS CANADENSIS (p. 114). 

 g. Flowers epigynous. 

 h. Flowers. not grouped in dense heads. 

 i. Leaves whorled; stem weak, bristly. 



Bedstraw. GALIUM AEARINE (p. 116)- 

 i. Leaves opposite, not whorled. 

 j. Delicate plants without connate leaves (Houstoniay. 

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



Bluets, HOTTSTONIA CAERXTI-EA (p. 116). 

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



HOTJSTONIA PURPUREA (p. 117). 

 j. Coarse plant; some leaves connate. 



Horse Gentian, TRIOSTEUM PERFOLIATUM (p. 118). 

 h. Flowers grouped in dense heads (Contpositae) ; 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- (£n^eron). 

 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 MILLEFOLIUM (p. 122). 

 I. 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). 

 I. Leaves not opposite. 

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



Black-eyed Susan, RUDBECKIA HIRTA (p. 121). 

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



Golden Ragwort, SENECIO AUREUS (p. 123). 

 3. Heads discoid (1. 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 AMPLEXICAULIS (p. 124). 

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



Dandelion, TARAXACUM OFFICINALE (p. 125;. 



