MARYLAND WEATHER SERVICE 455 



VITACEAE. 



Vitis labrusca L. Pox Grape. 



Throughout the state; in moist and dry forests and occasionally on trees 

 in the open; common. 



Vitis aestivalis Michx. Summer Grape. 



Throughout the state; in forests and open situations; common. 



Vitis cordifolia Michx. Chicken Grape, Frost Grape. 



Throughout the state; in forests and open situations; common. 



Vitis rotundifolia Michx. Bullace Grape. 



Coastal Zone; in the river swamps of Worcester County; infrequent. 

 Worcester County, Steves Island (664). 



Parthenocissus quinquefolia (L.) Planch. Virginia Creeper. 



Throughout the state; in all situations; one of the commonest climbers. 



TILIACEAE. 



Tilia americana L. Linden, Basswood. 



Rare in the Coastal Zone in ravine slopes; infrequent in the Lower Mid- 

 land District, common in the Upper Midland District and Mountain 

 Zone in deep well-drained soils of the lower slopes of mountain ridges. 



MALVACEAE. 



Malva sylvestris L. High Mallow. 



Midland Zone; in forests and open situations; infrequent. Introduced 

 from Europe. 



Malva rotundifolia L. Low Mallow, Cheeses. 



Throughout the state; in cultivated and waste grounds; common. Intro- 

 duced from Europe. 



Sida spinosa L. Prickly Sida. 



Throughout the state; in waste and cultivated grounds; frequent. Intro- 

 duced from the southern states. 



Abutilon abutilon (L.) Rusby. Velvet Leaf. 



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

 Introduced from India. 



Kosteletzkya virginica (L.) A. Gray. 



Coastal Zone; in salt and brackish marshes; common. 



Hibiscus moscheutos L. Swamp Rose-Mallow. 



Coastal Zone; in brackish and fresh marshes; common. 

 Caroline County, Dover Bridge (206S). 



