Jones: Flora of Illinois 17 



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



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

 slender, trailing; flowers in pairs, nodding, pink, fragrant, about I cm. long..-. 



Liimaea in 146. Caprifoliaceae 



12. Leaves net evergreen; plants net 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 134. VerBENACEAE 



14. Ovary deeply 4-lobed, the style arising between the lobes; plants usually 



with a mint odor; corolla usually bilabiate, rarely nearly regular 



135. Labiatae 



13. Fruit of only 1 nutlet, or else a capsule with many seeds. 



15. Flcwers reflexed and becoming appressed to the stem in fruit; fruit a 



single nutlet in the bottom of the calyx; calyx-teeth hooked at the lip; 



coiolla purplish; leaves slender-petioled 141. PhrymacEAE 



15. Flowers not reflexed and appressed to the stem; calyx-teeth not hooked. 



16. Ovary inferior; stamens 3 147. Valerianaceae 



16. Ovary superior; stamens usually 2, or 4, rarely 5 



137. SCROPHULARIACEAE 



Section 7. Dicotyledonous Herbs (except Smilax) With Alternate Leaves 



I. Flowers sessile in dense heads on a common receptacle surrounded by an involucre of 



bracts 1 52. CoMPOSlTAE 



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

 by an involucre of bracts. 

 2. Stem-leaves reduced to minute scales; corolla irregular, spurred; plants small, grow- 

 ing in wet soil 138. Lentibulariaceae 



2. Stem-leaves not all reduced to scales. 



3. Leaves with stipules, these sometimes united to form a sheath (sometimes fuga- 

 cious). 

 4. Stipules united and forming a membranous sheath at the nodes; fruit an achene 



50. POLYGONACEAE 



4. Stipules not sheathing; fruit a several-seeded capsule or pod. 



5. Petals none; fruit a small 3-loculed capsule 94. EuphorbiaceaE 



5. Petals present; plants pubescent; fruit a 1-loculed pod. 



6. Leaves sessile or nearly so; flowers yellow, papilionaceous 



Crolalaria in 84. Leguminosae 



6. Leaves petioled ; flowers greenish white H^banihus in 108. ViOLACEAE 



3. Leaves without stipules. 



7. Petals separate, or none; calyx sometimes petal-like. 



8. Plants with milky juics; stem umbellately branched above; upermost leaves 



whorled; involucres with white, petal-like appendages 



94. EUPHORBIACEAE 



8. Plants without milky juice; stems and leaves not as above. 



9. Calyx and corolla absent; flowers in spikes; leaves cordate, petioled 



37. Saururaceae 



9. Calyx present; corolla present or absent. 

 10. Flowers small, green. 



1 I . Flowers in umbels; perianth 6-parted; fruit a berry 



Smilax in 31. LiLIACEAE 



1 I . Flowers not in umbels; perianth not 6-parted; fruit not a berry. 

 12. Plants perennial, pubescent; fruit a capsule, with more than I 



seed; leaves small and narrow 107. CiSTACEAE 



12. Plants annual, glabrous or pubescent; fruit an achene, or a I- 

 seeded capsule. 

 13. Flowers all in loose cymose axillary clusters; style I, not 



branched; plants pubescent 



Parietaria in 46. Urticaceae 



