MARYLAND WEATHER SERVICE 445 



CAESALPINACEAE. 



Cercis canadensis L. Red-bud. 



Rare in the Coastal Zone, where it is found on gravel slopes underlaid 

 by clay; common in the Midland Zone, where it grows chiefly on slopes 

 bordering streams and on rocky slopes. It is particularly abundant in 

 the forests of the limestone region. It is apparently absent from the 

 Mountain Zone. 



Cassia nictitans L. Sensitive Pea. 



Throughout the state; in open dry situations; common. 



Cassia chamaecrista L. Partridge Pea. 



Throughout the state; in open dry situations; being most common in the 

 light soils of the Coastal Zone. 



Cassia marylandica L. Wild or American Senna. 



Throughout the state; in flood plains and along streams; frequent. 

 Cecil County, Charlestown (400). 



Gleditsia triacanthos L. Honey or Sweet Locust. 



Throughout the state; being most frequent in the Upper Midland Dis- 

 trict. Introduced from Europe. 



PAPILIONACEAE. 



Baptisia australis (L.) R. Br. Blue Wild Indigo. 



Washington County, flood plain of the Potomac at Williamsport (1805). 

 Baptisia tinctoria (L.) R. Br. Wild Indigo. 



Throughout the state; in dry forests and open situations, being most 

 common in sandy soil. 



Crotalaria sagittalis L. Rattle-box. 



Infrequent in the Coastal Zone, not observed elsewhere in the state; in 



open dry situations. 

 Anne Arundel County, Annapolis (M. A. Chrysler). 



Lupinus perennis L. Wild Lupine. 



Throughout the state; in dry forests, being most abundant on the light 

 soils of the Western Shore District of the Coastal Zone. 



Cytisus scopariaus (L.) Link. Scotch Broom. 



In cultivated grounds; introduced from Europe. 



Anne Arundel County, Annapolis (M. A. Chrysler). 

 Medicago sativa L. Purple Medic. 



Throughout the state; in cultivated grounds and waste places; common. 

 Introduced from Europe. 



Medicago lupulina L. Black or Hop Medic. 



Throughout the state; in cultivated grounds and waste places; common. 

 Introduced from Europe. 



