Jones: Flora of Illinois 21 



1, not branched; plants pubescent 



Parietaria in 73. Urticaceae 



13. Flowers all or mostly in spikes or terminal cymes 



or panicles, or else all in dense, sessile, axillary 



clusters; styles 2 or 3, or 1 and branched. 



14. Flowers subtended by scarious bracts, the 



sepals sharp-pointed ; leaves not linear or 



with spiny tips; plants never white-mealy 



28. Amaranthaceae 



14. Flowers not subtended by scarious bracts; 

 sepals not awn-pointed; leaves linear and 

 with spiny tips; or the plants whitish-mealy 

 at least about the inflorescence or the 



lower surface of the leaves 



27. Chenopodiaceae 



10. Flowers not green; petals present, or the calyx colored and 

 petal-like. 

 15. Leaves cordate, velvety-pubescent; petals yellow; carpels 



10-17, pubescent, dehiscent at the apex 



Abutilon in 23. Malvaceae 



15. Leaves not cordate, or if so, not velvety-pubescent. 



16. Sepals 2 25. Portulacaceae 



16. Sepals more than 2 (rarely cohering in pairs). 



17. Flowers borne on the lower part of the stem near 

 the ground; calyx S-shaped; petals none; 



leaves petioled, cordate or halberd-shaped 



Aristolochia in 87. Aristolochiaceae 



17. Flowers borne on the upper part of the stem; 

 calyx never curved. 

 18. Ovary inferior. 



19. Petals yellow or purplish; fruit a several- 

 seeded capsule 83. Onagraceae 



19. Petals none, the sepals whitish and petal- 



like; fruit 1-seeded, indehiscent; plants 



glabrous, glaucous 88. Santalaceae 



18. Ovary superior. 



20. Petals none, the 5 sepals petal-like; flow- 



ers in racemes; fruit a juicy dark purple 



berry 30. Phytolaccaceae 



20. Petals 4-6; fruit a capsule or pod. 



21. Flowers regular; anthers opening lon- 

 gitudinally. 

 22. Style 1. or stigma sessile. 



23. Petals and stamens hypogy- 

 nous. 

 24. Sepals, petals, and stamens 

 each 5 ; fruit a 5-loculed 



capsule 37. Linaceae 



24. Sepals and petals each 4 ; 

 stamens 6, four long and 

 two short; fruit a 1- or 



2-loculed capsule 



18. Cruciferae 



