116 PRACTICAL BOTANY. 



If, Stamens inserted on the receptacle (13. CI. of L.) . . .8 



Stamens inserted into the calyx (12. CI. of L.) 48 



Stamens inserted on a one-sided disk, all turned to one 

 side. Calyx 4-parted. Petals 4, greenish-yellow ; the upper 

 one 3 to 5-cleft, the two lateral trifid, the lowest entire, 

 linear. Leaves lanceolate, with a tooth on each side, at the 

 base. Flowers spiked. Reseda luteola, L. 



8, Pistil one (sometimes compound and many-celled). . .9 



Pistils more than one 25 



O, Flowers regular 10 



Flowers irregular; one of the sepals and two of the 

 petals spurred 42 



10, Calyx of two deciduous sepals. Plants with a milky 

 or colored juice 11 



Calyx only apparently of two sepals ; the 2 outer of 

 the 4 being large and leaf-like. Low, shrubby plant 23 



Calyx of more than 2 sepals, sometimes early decidu- 

 ous 16 



11, Petals 8-12, spatulate-oblong, the inner ones nar- 

 rower. Stigma 2-grooved. Leaf radical, rounded, pal- 

 mately lobed. Naked scape 1-flowered. Corolla white. Juice 

 red-orange-color. Sanguinaria Canadensis, L. 



Petals fewer, commonly 4. Juice white or yel- 

 low 12 



12, Juice white. Capsule opening by 4-20 pores or 

 chinks under the margin of the broad crown of stigmas. 

 Flower-buds nodding. Petals 4. Papaver. 



Juice yellow 13 



13, Leaves and pods prickly, the former pinnatifid. Flow- 

 ers pale yellow or white, peduncled, axillary, and terminal. 

 Sepals sometimes 3. Argemone Mexicana, L. 



Leaves not prickly 14 



14, Pods bristly, 3- to 4-valved. Style columnar. Leaves 

 pinnately cleft or divided. Peduncles axillary, 1-flowered. 

 Corolla yellow. Stylophorum diphyllum Nutt. 



[3Ieco7i02:>sis dlphylla, D. C.) 

 Pods naked, or only rough with tubercles 15 



