SCROPHULAKIACEAE 171 



Branches of thyree spreading. 1. P. Digitalis. 



Thyrse spike-like. 2. P. tubiflorus. 



1. P. Digitalis (Sweet) Nutt. l-4 high, glabrous, except the in- 

 florescence : leaves ovate-oblong to lanceolate, denticulate, the lower 

 petioled, the upper clasping : thyrse panicle-like, spreading : corolla 

 abruptly inflated, V long, white. Common in woods and low grounds. 

 May-July. 



2. P. tubiflorus Nutt. Resembles the last : thyrse narrow, spike- 

 like : corolla not abruptly inflated, 1' long. Occasionally adventized at 

 Sheffield, Wayne City and Courtney. May-July. 



6. COLLINSIA Nutt. 



Annual herbs with opposite leaves and flowers verticillate in their axils. 

 Upper lip of corolla 2-cleft, the lower 3-cleft, its middle lobe keeled and 

 enclosing the stamens and style. 



1. C. verna Nutt. BLUE-EYED MARY. 10 / -20 / high, glabrous : leaves 

 ovate, toothed, the lower petioled, the upper sessile : corolla 8" long, its 

 lower lip blue, the upper white. Locally common in rich woods, Shef- 

 field, Washington Park, Dodson, Grain Valley. April-May. 



7. MIMULUS L. MONKEY FLOWER. 



Herbs with opposite leaves and axillary peduncled flowers. Upper lip 

 of corolla erect, 2-lobed, the lower spreading, 3-lobed. 



Leaves sessile. 1. M. ringens. 



Leaves petioled. 2. M. alatus. 



1. M. ringena L. Glabrous perennial, l-2 high : leaves lanceolate, 

 serrate : peduncles longer than the calyx : corolla violet, 12 /7 long. 

 Common in moist grounds. June-October. 



2. M. alatus Soland. Resemble the last : stem winged : peduncles 

 shorter than the calyx. Common in moist grounds. June-October. 



8. CONOBEA Aubl. 



Herbs with opposite leaves and small pedicelled axillary flowers . Calyx 

 segments equal. Upper lip of corolla 2-lobed, the lower 3-lobed. 



1. C. multifida ( Michx. ) Benth. RIVER WEED. Diffusely spreading, 

 2 / -8 / high, short-pubescent : leaves pinnatifid, petioled : corolla bluish, 

 2 X/ long. Often common in wet sandy soil, especially along streams. 



June-October. 



9. MONNIBRA P. Br. 



Herbs with opposite leaves and axillary flowers. Upper division of 

 calyx broader than the other. Corolla (in ours) 2-lipped, the upper lip 

 2-lobed, the lower 3-lobed. 



1. M. rottmdifolia Michx. WATER HYSSOP. Stems creeping and float- 

 ing, hairy : leaves ovate-orbicular, obtuse, entire : flowers white, 3" 

 long. In swamps, Sheffield (abundant), Greenwood, Lake City, Court- 

 ney. May-October. 



