788 



BORAGINACEAE 



Heliotropium 



50 



Map 170! 



Cynoglossum officinale 



^50 



Map 1702 



Cynoqlossum virginianum L. 



Map 1703 

 Lappula echmata Gilib. 



Nutlets not armed with prickles. 

 Racemes without bracts. 

 Plants large and coarse with long, acuminate leaves. .7090. Symphytum, p. 790. 



Plants not large and coarse; leaves mostly obtuse 



7100. Myosotis virginica, p. 791. 



Racemes with bracts. 



Lobes of corolla spreading, rounded 7109. Lithospermum, p. 792. 



Lobes of corolla erect, acute 7113. Onosmodium, p. 794. 



Flowers blue to purplish. 

 Nutlets armed with prickles. 



Leaves more than 1 cm wide; nutlets (exclusive of prickles) 4-7 mm long 



7064. Cynoglossum, p. 788. 



Leaves mostly less than 1 cm wide; nutlets (exclusive of prickles) less than 4 mm 



long 7073. Lappula, p. 789. 



Nutlets not armed with prickles. 

 Flowers regular. 



Corolla generally 2-2.5 cm long 7102. Mertensia, p. 792. 



Corolla less than 2 cm long. 



Stem leaves on long petioles 7052. Heliotropium, p. 788. 



Stem leaves sessile or on short petioles 7100. Myosotis, p. 790. 



Flowers irregular. 



Corolla bent at about the middle; stamens included 7094. Lycopsis, p. 790. 



Corolla not bent; stamens exserted 7118. Echium, p. 794. 



7052. HELIOTROPIUM [Tourn.] L. Heliotrope 



1. Heliotropium Indicum L. India Heliotrope. Map 1700. Infre- 

 quent in moist, sandy, open, generally alluvial woods of the southern part 

 of the state ; more rarely in waste places and fallow fields. 



Nat. of India; naturalized in U. S. from N. C, Ky., to Mo., southw. to 

 Fla. and Tex. 



7064. CYNOGLOSSUM [Tourn.l L. Houndstongue 



Flowers maroon, purple or rarely white; stems leafy to the top; nutlets flat 



1. C. officinale. 



Flowers blue; stems leafless above; nutlets convex 2. C. virginianum. 



