196 American Midland Naturalist Monograph No. 7 



6. Hyoscyamus L. — Henbane 

 H. nigcr L. Waste places, occasional; native of Eur. June-Sept. 



7. Datura L. 



1. Corolla 6-10 cm long; leaves angle-toothed; waste places and cul- 

 tivated ground, not uncommon; nat. from the tropics. June- 

 Oct. Jimson-weed D. stramonium L. 



1. Corolla 10-20 cm long; leaves entire or undulate; waste places, not 

 common: nat. from trop. Asia. July-Sept. [D. mctrl sensu auth. 

 non L.J D. innoxia Mill. 



8. Petunia Juss. 

 P. axillaris BSP., with white flowers, the cylindrical corolla-tube 

 3-4 times the length of the calyx; P. violacca Lindl., and P. hybrida 

 Vilm., with flowers red or violet, the former with corolla 3-4 cm 

 long, the latter 5-9 cm long; all native to S.Am., frequently cultivated 

 and occasionally apparently spontaneous, but not established in 111. 



108. Scrophulariaceae Lindl. — Figwort Family 



1. Anther-bearing stamens 5; corolla rotate; leaves alternate 1. Verbascum 



1. Anther-bearing stamens 4 or 2. 



2. Corolla spurred at base; capsules opening by one or more slits or pores 

 near the apex. 

 3. Leaves pinnately veined. 



4. Leaves linear to narrowly lanceolate. 



5. Flowers in racemes 6. Linaria 



5. Flowers solitary in the leaf axils 7. Chaenorrhinum 



4. Leaves ovate to orbicular 8. Kickxia 



3. Leaves palmately veined and lobed 9. Cymbalaria 



2. Corolla not spurred; capsules 2- to 4-valved. 



6. Fifth sterile stamen present, either elongated, or represented by a scale 

 or small gland on the upper side of the corolla-tube. 

 7. Sterile stamen elongated. 



8. Flowers in a dense spike; seeds winged; anthers woolly; leaves 

 serrate, petioled; plants glabrous 2. Chelone 



8. Flowers in a terminal panicle or raceme; seeds wingless 



3. Penstemon 



1 . Sterile stamen represented by a small gland or scale on the upper 

 inner side of the corolla. 



9. Corolla maroon or purplish-green; leaves petioled, sharply serrate 



or dentate; perennials 4. Scrophularia 



9. Corolla blue and white; upper leaves sessile; annuals 5. Collinsia 



f). Fifth sterile stamen absent. 

 10. Fertile stamens 2. 



II. Calyx 5-parted ; two stamens anther-bearing, and two sterile, or 

 the latter sometimes absent. 

 12. Corolla purplish; calyx without bracts; sterile filaments 2- 



forked, slightly exserted 10. Lindernia 



