1922] SARGENT, NOTES ON NORTH AMERICAN TREES, X. 199 



A shrub up to 4 ra. high, with stems covered with dark bark, thin gray 

 branches armed with many slender straight or slightly curved spines 3-4 

 cm. long, persistent and becoming compound on old stems, and slender 

 yellow-green glabrous branchlets. 



Ohio. Harding County, Mt. Victory, R. E. Horsey, No. 358 (type), 

 May 19 and September 24, 1915. 



From the three other species of this group with more or less villose 

 corymbs, twenty stamens and red or rose-colored anthers this new species 

 differs in the shorter often rounded lobes of the much smaller leaves, 

 shorter petioles, smaller and less villose corymbs, and in its globose not 

 short-oblong fruit. 



Crataegus Margaretta var. Brownii (§ Rotundifoliae), n. var. — 

 Crataegus Brownii Britton in Bull. N. Y. Bot. Gard. i. 447 (1900). 



Differing from the type in its usually narrow-oblong-obovate to elliptic 

 leaves with acute lobes and smaller flowers and fruit. 



The leaves of the type of C. Margaretta Ashe as it grows in the neighbor- 

 hood of St. Louis, Missouri, are ovate, rounded at apex, broad-cuneate 

 or rounded at base with short rounded lobes, and about as long as wide; 

 the expanded flowers vary from 1.5-2 cm. in diameter, and the short-oblong 

 fruit is about a centimeter in length. In Missouri, especially in the southern 

 part of the state, trees occur with the typical leaves of the species growing 

 with trees with sharply lobed leaves and smaller flowers and fruit. In 

 northeastern Missouri, trees with broad and with narrow elliptic leaves 

 occur in the neighborhood of Hannibal, and eastward the form with 

 narrower acutely lobed leaves and smaller flowers and fruit is the more 

 abundant. In the region east of the 



M 



typical form only from London, Ontario, from Downer's Grove, Illinois, 

 from Lansing, and Vicksburg, Michigan, from Columbus, Mt. Victory and 

 Delaware, Ohio, from Grant, Allen, Tipton and La Grange Counties, 

 Indiana, and from Sweet Springs and White Sulphur Springs, West 

 Virginia. On the type specimen of Crataegus Brownii from Buchanan, 

 Botetourt County, Virginia, the leaves on the flowering branch vary from 

 elliptic to oblong-obovate ,and are not at all or only slightly lobed, and those 

 of a fragment of what appears to be from the end of a young branch are 

 slightly lobed with small rounded lobes. Between the type of C. Brownii 

 and that of C. Margaretta innumerable forms occur varying in the shape of 

 the leaves and in the size of the flowers and fruit, some of these approaching 

 C. Margaretta and others C. Brownii, and it is impossible in the mass of 

 material before me to find constant characters by which C. Brownii can 

 be distinguished from C. Margaretta except as a variety. This variety 

 is especially abundant in Allen County, Indiana, where on the east side 

 of Lake Everett about twelve miles northwest of Fort 



Way 



Mr 



Deam has found nearly all the forms growing together. 



