54 MISSOURI BOTANICAL GARDEN BULLETIN 
MACRACANTHAE GROUP 
Crataegus tomentosa.—A tree 15-20 feet high, with a trunk 
covered with smooth, pale gray or dark brown bark. Branches 
slender, spreading, smooth, gray, forming a wide flat head; 
branchlets slender, covered, when they first appear, with a 
thick hoary tomentum, becoming dark orange color in their 
first winter and ashy gray the second season, unarmed or 
armed with few slender, straight, ashy gray spines. Leaves 
ovate, rhombic or elliptic, acute at the apex, gradually nar- 
rowed to the square base, sharply serrate above and often 
divided above the middle into several short lobes, nearly 
fully grown when the flowers open in late May or early June, 
at maturity firm, thin, gray-green above, pale pubescent be- 
neath, turning brilliant orange and scarlet in autumn. Flow- 
ers white, in many-flowered corymbs; stamens 20; anthers 
pale rose color. Fruit ripening in October, dull orange-red, 
persistent throughout the winter. Habitat: in rich soil, north- 
western Missouri to the valley of the Meramec River, Ontario, 
New York, Ohio, Michigan, Kansas south to Alabama. 
Crataegus simulata.—A small tree 3-7 feet high. In moist 
rich soil, Joplin and Jasper Counties, Missouri. 
Crataegus hispidula.—A shrub 6-9 feet high. On limestone 
cliffs, Jasper County, Missouri. 
Crataegus missouriensis—A shrub 3-6 feet high. On bluffs 
and rocky banks, Shannon and Ripley Counties, Missouri. 
Crataegus globosa.—A shrub 15-20 feet high. On dry grav- 
elly banks of streams, Shannon, Taney, and Christian Coun- 
ties, Missouri. 
Crataegus obscura.—A shrub 3-8 feet high. On limestone 
cliffs, Jasper County, Missouri. 
Crataegus spinulosa—A shrub 6-8 feet high. In low moist 
soil along streams, Jasper County, Missouri. 
Crataegus Chapmani.—aA tree 15-20 feet high. On banks 
of streams, Taney County in Missouri, Virginia to northern 
Georgia and Tennessee. 
Crataegus rupicola.—A shrub 6-10 feet high. On dry rocky 
hills, Taney County, Missouri. 
Crataegus pudens—A shrub 8-15 feet high. On gravelly 
banks of streams, Shannon County, Missouri. 
Crataegus mollicula.—A. shrub 6-12 feet high. Rocky banks 
of streams, Shannon County, Missouri. 
