250 CONTRIBUTIOISrS FROM THE NATIONAL HERBARIUM. 



2. Verbascum blattaria L. Moth mullein. 



Fields and waste ground; common. June-July. Native of Eur.; extensively 

 naturalized in N. Amer. 



2. KICKXIA Dum. 

 1. Kickxia elatine (L.) Dum. 



Fields and waste ground; occasional. July-Sept. Native of Eur.; naturalized in 

 eastern N. Amer. (Linaria elatine Mill.) 



3. LINARIA Mill. 



Flowers yellow; leaves pale green 1. L. vulgaris. 



Flowers blue; leaves bright green 2. L. canadensis. 



1. Linaria vulgaris Hill. Butter-a^jd-eggs. 

 Fields and waste ground; frequent. June-Aug. Native of Eur. and Asia; widely 



naturalized in N. Amer. {L. linaria Karst.) 

 The plants have a very marked and characteristic odor. 



2. Linaria canadensis (L.) Dum. Blue toad-flax. 

 Dry woods or fields; frequent. May-June. Widely distributed in N. Amer.; 



also in S. Amer. 



Corolla often much reduced in autumnal specimens, the flowers being cleistogamous. 



4. SCROPHULARIA L. 



1. Scrophularia marylandica L. Figwort. 



Woods and thickets; occasional. Aug.-Sept. Eastern U. S. (<S. nodosa of W^ard's 



Flora.) 



5. CHELONE L. 



1. Chelone glabra L. Turtlehead. 



Swamps; infrequent. Aug.-Sept. Eastern N. Amer. 



6. PENSTEMON Mitchell. Beard-tongue. 



Stems hairy throughout, with usually long hairs; throat of the corolla densely bearded. 



1. P. hirsutus. 

 Stems nearly or quite glabrous, usually with very minute hairs below, the branches of 

 the inflorescence more or less hairy; throat of the corolla very slightly or not at 

 all bearded. 

 Corolla purplish, 2-2.5 cm. long, the tube not enlarged near the base. 



2. P. laevigatus. 



Corolla white or pinkish, 2.5-3 cm. long, the tube slightly enlarged on one side near 



the base 3. P. digitalis. 



1. Penstemon hirsutus (L.) Willd. 



Woods and thickets; frequent. May-June. Eastern U. S. (P. pubescens Soland.) 



2. Penstemon laevigatus Soland. 



Woods and thickets; frequent. May-June. Eastern U.S. {P. penstemon Britton.) 



3. Penstemon digitalis (Sweet) Nutt. 



Woods and thickets; occasional. May-July. Eastern U. S. (P. laevigatus digi- 

 talis A. Gray.) 



This is not very definitely separated from the preceding species, and probably does 

 not deserve specific rank. 



7. PAULOWNLA Sieb. & Zucc. 



1. Paulownia tomentosa (Thunb.) Baill. Empress tree. 



Frequent in waste ground. Native of Japan; common in cultivation and often 

 escaping. 



This is probably the most rapid grower of any tree found in the eastern United States, 

 sprouts attaining a very large size in a single season. The flower panicles are formed 

 in autumn. The large showy flowers appear before the leaves. 



