KEY FOR JUNE TO NOVEMBER 



397 a Leaves all basal; heads borne on leafless stalks 398 



b Leaves not all basal; heads borne on leafy stems 399 



398 a Leaves with more or less entire margins. .Hieracium. p 219 

 b Leaves pinnatifid or with coarsely toothed margins 



Adopogon. p 2IQ 



399 a Bracts of involucre in i or 2 rows with no smaller, 



outer ones Adopogon. p 219 



b Principal bracts of involucre in i row with several 



smaller, outer ones Crepis. p 219 



400 a Heads oblong, 1-4 in. long with prickly involucre; 



leaves and stems with prickles; flowers usually open- 

 ing in a ring around the head Dipsacus. p 216 



b Plants not completely as in a 401 



401 a Stamens 2-4, not joined into a tube around the style; 



flowers lilac; heads 1-2 in. broad; bracts of the in- 

 volucre much smaller than the flowers .... Scabiosa. p2l6 

 b Plants not completely as in a Compositae. p 221 



402 a Flowers numerous, small, arranged in a spike which is 



subtended by a white, ovate bract 1-3 in. \ong.Calla. p 131 



b Flowers not completely as in a 403 



403 a When broken plants exude a colored juice 404 



b When broken plants do not exude a colored juice 408 



404 a Flowers i in. or more broad 405 



b Flowers % in. or less broad 406 



405 a Leaves with spiny-toothed margins Argemone. p 755 



b Leaves not with spiny-toothed margins .... Papaver. p 155 



406 a Flowers with 5 hoods alternate with the petals; inside 



each hood is a pointed horn Asclepias. p 200 



b Flowers not with hoods or horns 407 



407 a Flowers pink, the corolla tubular; stamens 5, distinct 



Apocynum. p 200 

 b Flowers not completely as in a Euphorbia, p 180 



408 a Perianth parts 3 or 6, often undifferentiated ; leaves 



usually with entire margins and parallel veins .... 409 

 b Perianth parts 4, 5 or numerous, or joined into a tube; 



plants not completely as in a 435 



409 a Flowers irregular 410 



b Flowers regular 421 



410 a Ovary superior; stamens 6 Commelina. p 132 



b Ovary inferior ; stamens i or 2 411 



411 a Flowers with a large inflated lip i in. or more long 



Cypripedium. p 138 

 b Flowers not with a large inflated lip as in a 412 



412 a Lip of flowers conspicuously fringed. .Blephariglottis. p 139 

 b Lip of flower not conspicuously fringed 413 



413 a Leaves all basal and ovate in shape 414 



b Leaves not completely as in a 416 



