293] FLORA OF COLUMBIA AND VICINITY 151 



468. P. loensia (Wood) Bailey [M. loemis (Wood) Brit- 

 ton]. Western crab apple. 



On the rocky banks of streams and rocky hillsides. 

 Wisconsin to Minnesota; Kentucky to Louisiana and 

 Oklahoma. 



189. AMELANOHIER. Medic. Service berry. 



469. A. Canadensis (L.) Medic. Shad-bush. June berry. 



Edges of cliffs and on rocky banks; frequent. 



Newfoundland to Ontario, Minnesota and South Da- 

 kota; Florida to Louisiana. 



190. MESPILUS L. ICRATAEGUS L.]. Med- 

 lar. Hawthorn. 



470. M. Orus-galli (L.) Willd. \C. Crus-galli L.]. Cock- 

 spur THORN. 



In thickets and hawthorn glades; common and immense- 

 ly variable, both in foliage and fruit. 

 Quebec to Manitoba; Florida to Texas. 



471. M. punctata (Jacq.) Willd. \C. punctata Jacq.]. 

 Scarce in hawthorn glades north of Columbia. 



Quebec to Wisconsin; Georgia to Tennessee and Mis- 

 souri. 



472. M. cordata (Mill.) Willd. [C cordata (Mill.) Ait.]. 

 Washington thorn. 



A few clumps along streams and in the hawthorn glades 

 north of Columbia. 



New Jersey to Illinois and Missouri; Georgia to Ten- 

 nessee. 



473. M. Eggerti (Britton) Daniels \C. Eggerti Britton]. 

 Rare in the hawthorn glades north of Columbia. 

 Iowa to Missouri and Kansas. 



475. M. viridis (L.) Sweet [C viridis L.]. Green thorn. 

 Common along streams in the hawthorn glades north. 

 Virginia to Missouri; Florida to Texas. 



475. M. nitida (Engelm.) Daniels \C. nitida Engelm.]. 

 Shining thorn. 



