Cratagus. ROSACEiE. 41 



122. Crataegus rivularis, Nutt. 



British Columbia, south through eastern Oregon and Washington, east 

 and southeast along the mountain ranges of Idaho, Montana, Utah, and 

 Colorado to the Pinos Altos Mountains, New Mexico. 



A small tree, 6 to 8 metres in height, with a trunk rarely exceeding 

 0.30 metre in diameter ; or often a tall, much-branched shrub, forming 

 dense, impenetrable thickets along borders of streams and swamps. 



Wood heavy, hard, close-grained, compact ; medullary rays numerous, 

 thin ; color bright reddish brown, the sap-wood nearly white. 



123. Crataegus Douglasii, Lindl. 



British Columbia, south through Washington and Oregon to northern 

 California, extending east through Idaho and Montana to the western base 

 of the Rockv Mountains. 



A small tree, sometimes 12 metres in height, with a trunk 0.30 to 0.45 

 metre in diameter, or often a tall shrub throwing up many stems from the 

 ground and forming impenetrable thickets ; rather wet, sandy soil along 

 streams, and reaching its greatest development in the valleys west of the 

 Cascade Mountains ; toward its eastern limits a low shrub. 



Wood heavy, hard, tough, close-grained, compact, satiny, susceptible of 

 a beautiful polish ; medullary rays numerous, thin ; color nearly white 

 tinged with rose, the sap-wood lighter ; used for wedges, mauls, etc. 



1 24. Crataegus brachyacantha, Sargent & Engelm. 

 Hoy's Haw. 



Western Louisiana and eastern Texas. 



A tree 9 to 12 metres in height, with a trunk sometimes 0.60 metre in 

 diameter ; borders of streams in low, very rich soil ; the largest North 

 American representative of the genus ; rare and local. 



Wood heavy, hard, very close-grained, compact, susceptible of a beau- 

 tiful polish ; medullary rays numerous, very obscure ; color light brown 

 tinged with rose, the sap-wood lighter. 



The large fruit blue-black. 



125. Crataegus arborescens, Ell. 



Valley of the Savannah River, South Carolina, south to western Flor- 

 ida ; and from the neighborhood of Saint Louis, Missouri, south and 

 southwest to western Louisiana, and the valley of the lower Colorado 

 River, Texas. 



A small tree, 6 to 9 metres in height, with a trunk sometimes 0.45 

 to 0.60 metre in diameter ; borders of streams and low, wet swamps. 



Wood heavy, hard, not strong, close-grained, compact ; susceptible of a 

 beautiful polish ; medullary rays very numerous, obscure ; color light 

 brown tinged with red, the sap-wood lighter. 



The small globular fruit bright red, or, more rarely, orange. 



