FLORA OF WASHINGTON AND VICINITY. 73 



SAPINDACE^. 



Soapberry Family. 



Acer saccharinum, Wang. Sugar-Maple. Hard Maple. 



Early iu May. Only one certainly indigenous tree known ; this is located on the 

 fourth of the islands above High Island (Sugar-Maple Island) ; it has borne nothing 

 but leaves since its discovery in 187G. Qy. : Is this for want of cross-fertilization ? 



Acer dasycarpum, Ehrh. Silver Maple. 



Less common than A. rubrum in the wild state. Generally planted in the streets 

 of the city, where it often flowers in January and tends to become wholly dioecious. 

 January 15 to March. 



t Acer rubrum, L. Red Maple. Swamp-Maple. 

 Last of February to first of ^pril. 



tNegundo aceroides, Moench. Box- Elder. 

 Third week in April. 



Staphylea trifolia, L. American Bladder-nut. 

 First week in May. 



ANACARDIACEJEl. 



Cashew Family. 



Rhus typhina, L. Staghorn Sumac. 

 June. 



tRhus glabra, L. Smooth Sumac. 

 July. 



tRhus copallina, L. Dwarf Sumac. 



Here becoming large, 8<=™ in diameter and 5™ to 6™ high. Last half of July. 



tRhus venenata, DC. Poison Sumac. 



Common in swamps. First half of July. Found also occasionally growing on 

 dry ground, where it flowers at the end of May. 



tRhus Toxicodendron, L. Poison Ivy. 



Everywhere abundant. Pith on small vines, when clinging tightly to a support, 

 always near the outer side. (See American Naturalist, April, 1876, p. 232.) Last 

 half of May. 



Rhus aromatica. Ait. Fragrant Sumac. 



Broadwater. A single bush discovered by Mr. E. O. Graves. It bears pistillate 

 flowers each year, which never mature because not fertilized. Last half of April. 



LEGUMINOSiB. 



Pulse Family. 



tBaptisia tinctorla, R. Br. Wild Indigo. 

 Third week in June. 



tBaptisia austredis, R. Br. Blue False Indigo. 



Rocky river bottoms at Little Falls. Last of May or early in June. 



