PLANTS OP IOWA 213 



2760. D. tatula, L. Purple Thorn-apple. 



In waste places; from tropical America. 



SCEOPHULAEIACE^B. FIGWORT FAMILY. 



VERBASCUM, L. 



2761. V. thapsus, L. Great Mullen. 



Common introduced weed, in waste places. 



2762. V. Uattaria, L. Moth Mullen. 

 Waste places; from Europe. 



LINARIA, Hill. 



2763. L. linaria, (L.) Karst. Butter-and-Eggs. 

 Introduced from Europe ; in waste places. 



2764. L. canadensis, (L.) Dumont. Blue Toad-flax. 

 In dry soil. 



SCROPHULARIA, L. 



2765. 8. marylandica, L. Maryland Fig-wort. 

 Ill woods and thickets ; common. 



2766. 8. lepordla, Bicknell. Hare Figwort. 

 Along borders and on prairies; common. 



CHELONE, L. 



2767. C. glabra, L. Snake-head. 

 In bogs; infrequent. 



2768. C. olliqua, L. Red Turtle-head. 

 Infrequent. 



PENTSTEMON, Soland. 



2769. P. hirsutus, (L.) Willd. Hairy Beard-tongue. 

 Dry sandy soil; frequent. 



2770. P. canescens, Britton. Gray Beard-tongue. 

 Infrequent. 



2771. D. digitalis, (Sweet) Nutt. Foxglove Beard-tongue. 

 Escaped from gardens. 



2772. P. pentestmon, (L.) Britton. Smooth Beard-tongue. 

 In woods, infrequent. 



2773. P. grandiflorus, Nutt. Large-flowered Beard-tongue. 

 Sandy soil; not rare. 



2774. P. gracilis, Nutt. Slender Beard-tongue. 

 In moist places. 



