180 American Midland Naturalist Monograph No. 7 



8. Lysimachia L. — Loosestrife 



[Steironema Raf. ) 



1. Leaves gland-dotted (sometimes obscurely so). 



2. Plants more or less pubescent; corolla not dark-streaked. 



3. Calyx 4-5 mm long, often dark-margined; flowers in terminal 

 leafy panicles; roadsides and waste places, occasional; adv. 

 from Eur. July-Sept L. vulgaris L. 



3. Calyx 7-10 mm long, not dark-margined; flowers in axillary 



whorls; roadsides and waste places, occasional; ad\-. from 



Eur. June-July L. punctata L. 



2. Plants glabrous or nearly so. 



4. Stem erect; leaves lanceolate or elliptical; corolla usually 



with purple streaks or dots. 

 5. Leaves usually whorled; flowers axillary; fields and open 

 woods in the northern counties. June-July. Whorled 



Loosestrife L. quadrijolia L. 



5. Leaves mostly opposite. 



6. Flowers in terminal racemes; corolla-lobes lanceolate; 

 wet soil in the n. half of the state. June-July. Swamp- 

 candle L. terrestris (L.) BSP. 



6. Flowers in small head-like axillary spikes; corolla-lobes 

 linear; wet ground or shallow water in the northern 

 third of the state; also Wabash Co., Schneck in 1881. 

 May-Jime. Tufted Loosestrife [Nauniburgia thyrsi- 

 flora (L.) Duby] .L. thyrsiflora L. 



4. Stem trailing; leaves opposite, roundish; flowers axillary; 

 corolla not purple-marked; capsules rarely produced: moist 

 ground, common; nat. from Eur. May-July. Moneywort 



- - - L. nummularia L. 



1. Leaves not gland-dotted; stem erect; flowers nodding, on slender 

 axillary pedicels. 

 7. Leaves firm, linear, 2-8 mm wide, 1 -veined, the lateral veins 

 obscure; moist ground, locally throughout 111. June-Aug. 



L. quadriflora Sims 



7. Leaves pinnately veined. 



8. Leaves elliptical-lanceolate, 1-2 cm wide, short-petioled, 

 sparsely ciliate at base. 

 9. Leaves paler beneath, with scarcely any distinction of 

 petiole and blade; calyx-lobes not evidently nerved; 

 plants with slender rhizomes; woods and thickets, com- 

 mon throughout 111. June-Aug L. lanceolata Walt. 



9. Leaves equally green on both sides, gradually tapering into 



the narrowly winged petiole; calyx-lobes evidently 3- 

 nerved; plants not stoloniferous; moist ground, local. 



July-Aug L. hybrida Michx. 



8. Leaves ovate or ovate-lanceolate. 



10. Petioles conspicuously ciliate; median and lower blades 



6-15 cm long; corolla-lobes 10-13 mm long; stem erect. 



