Jones: Flora of Illinois 19 



42. Stamens 2; capsule 2-loculed 



108. SCROPHULARIACEAE 



Section 6. Dicotyledonous Herbs With Toothed or Lobed Opposite 



or Whorled Leaves 



1. Flowers sessile in dense heads on a common receptacle surrounded by an 

 involucre of bracts. 

 2. Stem with small prickles; chaff of the receptacle (among the flowers) 

 with long rigid spine-like tips; stamens 4, distinct 124. Dipsacaceae 



2. Stem not prickly; chaff of the receptacle not as above, sometimes absent; 



stamens 5, united by their anthers (syngenesious) 125. Compositae 



1. Flowers not sessile in dense heads on a common receptacle surrounded or 

 subtended by an involucre of bracts. 



3. Corolla of separate petals, or absent. 

 4. Leaves deeply lobed. 



5. Plants glabrous; leaves 2, peltate; flower solitary; petals 6-9, white 



9. Podophyllaceae 



5. Plants (at least the stem) pubescent; leaves 2 or more, not peltate; 

 flowers usually more than 1. 



6. Petals present; stamens 10; styles 5; fruit of 5 carpels 



36. Geraniaceae 



6. Petals none, but the sepals colored and petal-like; stamens more 



than 10; fruit of numerous achenes 3. Ranunculaceae 



4. Leaves merely toothed. 



7. Plants with milky juice (or if with watery juice, the pubescence stel- 

 late) ; the fruit deeply 3-lobed ; corolla none, but the flowers 

 surrounded by an often corolla-like involucre ....43. Euphorbiaceae 

 7. Plants with watery juice; fruit not 3-lobed. 

 8. Flowers green, without petals; fruit 1-seeded. 



9. Plants scurfy with minute whitish scales; stipules none 



Atriplex in 27. Chenopodiaceae 



9. Plants glabrous, or pubescent with slender, sometimes stinging 



hairs, never scurfy or scaly; leaves stipulate 73. Urticaceae 



8. Flowers with white or colored petals; fruit usually with more than 

 1 seed. 



10. Petals large ( 1 cm or more in length), pink or purplish; leaves 



3-4-ribbed; plants bristly-hairy 82. Melastomaceae 



10. Petals small (less than 1 cm in length) ; leaves not ribbed; 

 plants not bristly-hairy. 

 11. Ovary inferior; seeds with a tuft of soft hairs, or else the 



fruit with short, hooked hairs 83. Onagraceae 



H. Ovary superior; seeds without hairs; fruit never bristly .... 



62. Saxifragaceae 



3. Corolla sympetalous, the petals united, at least below. 



12. Leaves evergreen, small, oval or obovate, crenate above the middle; 

 stems slender, trailing; flowers in pairs, nodding, pink, fragrant, 



about 1 cm long Linnaea in 120. Caprifoliaceae 



12. Leaves not evergreen; plants not as above. 



13. Fruit of 2 or 4 nutlets; stems usually 4-angled. 



14. Ovary not lobed, the style terminal on it; plants lacking a mint 



odor; corolla usually nearly regular 116. Verbexaceae 



