1894-] PLANTS OF MONROE COUNTY. 63 



300. P. arbutifolia L.f. var. melanocarpa Hook. [Aroma nigra (Willd.) Britt.] 



Abundant in the marshes at Mendon ponds. 



301. P. Americana DC. \Sorbus Americana Marsh.] American Mountain 



Ash. Escaped from cultivation. 



302. P. Aucuparia Gaertn. European Mountain Ash. 



Several specimens in woods on the bank of Genesee river. 



123. CRA TAVGUS L. 



303. C. OXYACANTHA L. ENGLISH HAWTHORN. 



Infrequent. Bank Genesee river, below lower falls. Gates. Adams 

 Basin. Wayne county. 



304. C. coccinea L. Scarlet Thorn. 



Thickets and hillsides ; frequent. Common along the banks of the 

 Genesee river. 



305. C. tomentosa L. Black Thorn. 



Thickets along the river banks, old pastures, etc. ; scarce. 



306. C. tomentosa L. var. pyrifolia Gray. 



Same range as the preceding ; scarce. 



307. C. punctata Jacq. [C. tomentosa var. punctata Gray.) 



River banks and flats, fields, thickets, etc. ; common. Occasionally 

 with yellow fruit. 



308. C. Crus=galli L. Cock-spur Thorn. 



River banks and flats; rare. A fine specimen in Genesee Valley park. 

 Wayne county, E. L. Hankenson. 



124. AMELANCHIER Medic. 



309. A. Canadensis Torr. & Gray. [A. Canadensis (L.) Medic] Shad-bush. 



River banks, ravines, thickets, woodlands ; common. 



310. A. Canadensis var. rotundifolia T. & G. [A. rotundifolia (Mx.) Rcem.] 



Plentiful on the banks of Genesee river and Irondequoit bay. 



311. A. Canadensis var. (?) oblongifolia T. & G. [A.Botryapium (L. f.) D.C.] 



Ravines and low grounds. 



SAXIFRAGACE/E. 



125. SAX I FRAG A L. 



312. S. Virginiensis Michx. Early Saxifrage. 



River banks, ravines, hillsides ; abundant, except in the western part 

 of our district. 



313. S. Pennsylvania L. Swamp Saxifrage. 



Cold swamps; infrequent. Irondequoit, Dr. CM. Booth! Greece, 

 Miss Beckwith and Miss Macau ley. Adams Basin, Prof. W.H. Lennon. 

 Fisher's Station, M. S. Baxter. Wayne county, E. L. Hankenson. 



126. TIARELLA L. 



314. T. cordifolia L. False Mitre-wort. 



Hilly woods, river banks and ravines ; common. 



