Jones: Flora of Illinois 19 



26. Flowers smaller; calyx not enclosed by a pair of bracts. 



27. Plants with milky juice; fruit of 1 or 2 large pods, the seeds with 

 a tuft of silky hairs. 

 28. Flowers in umbels ; filaments united into a tube enclosing the 

 pistil 129. ASCLEPIADACEAE 



28. Flowers in cymes, purplish blue; stamens free 



Amsonia in 128. ApocYNACEAE 



27. Plants with watery juice; flowers not in umbels; seeds lacking a 

 tuft of hairs. 



29. Fruit of 4 (or sometimes fewer) nutlets; plants rough-hairy, often 



bristly, or glabrous and with blue flowers.... 133. BoRAGINACEAE 

 29. Fruit a capsule or berry; plants never rough-hairy. 



30. Flowers blue; styles 2; fruit a capsule 



132. Hydrophyllaceae 



30. Flowers not blue; style 1. 



31. Flowers white or pink or yellow; fruit a capsule; calyx 



not enlarged in fruit ...121. PrimulacEAE 



31. Flowers yellowish or whitish, often with a dark center; 

 fruit a berry, enclosed by the 5-lobed, 10-ribbed, often 



5-IO-angled, reticulated, inflated calyx 



Phvsalis in 136. SoLANACEAE 



25. Corolla irregular (zygomorphic). 



32. Corolla spurred; stamens 4, inserted on the corolla; plants with watery 



juice Linaria in 137. ScROPHULARIACEAE 



32. Corolla somewhat 2-lipped, the tube split along the upper side; stamens 

 5, free from the corolla, united by their anthers; plants with milky 

 juice 151. LOBELIACEAE 



Section 8. Dicotyledonous Herbs With Toothed or Lobed Alternate Leaves 



1. Flowers sessile, small, in dense heads on a common receptacle surrounded or subtended 



by an involucre of bracts; fruit an achene 152. CoMPOSITAE 



I . Flowers not as above. 



2. Fruit and ovary covered with hooked bristles; corolla minute, greenish yellow; 



leaves deeply lobed; flowers in small compact head-like umbels 



Sanicula in 1 19. Umbelliferae 



2. Fruit and ovary never with hooked prickles. 

 3. Leaves conspicuously lobed. 



4. Stems and leaves prickly; petals 5, united; fruit a berry 



Solatium in 1 36. Solanaceae 



4. Stems and leaves not prickly. 



5. Corolla of united petals; fruit a capsule. 



6. Flowers in spikes or panicles, or solitary in the axils; corolla irregular 

 137. ScROPHULARIACEAE 



6. Flowers in scorpioid cymes or racemes; corolla regular 



132. Hydrophyllaceae 



5. Corolla of separate petals, or petals absent. 



7. Calyx-lobes 3; flowers small, sessile, axillary, greenish, apetalous ; upper 



leaves toothed, the lower ones deeply pinnately lobed; plants of wet 



habitats; fruit sharply angled Proserpinaca in 116. Haloragidaceae 



7. Calyx-lobes or sepals more than 3. 

 8. Sepals and petals each 4. 



9. Ovary superior; stamens 6; capsule 2-valved 71. CrUCIFERAE 



9. Ovary inferior; stamens 8; capsule 4-valved 115. Onagraceae 



8. Sepals 5 or 6. 



10. Petals none; flowers small, green or greenish; fruit an achene or 



utricle. 



1 I . Leaves stipulate; sepals 6; stamens 6; fruit an achene 



50. POLYGONACEAE 



