542 



ROSACEAE 



Crataegus 



Map 1110 

 Crataegus Margaretta Ashe 



o 50 



Map III! 



Crataegus intricata Lange 



Map 1110. Leaves variable in size and shape, short-obovate, oval, rhombic, 

 lance-oblong, or nearly orbicular and sometimes wider than long, mostly 

 2-6 cm long, 1.5-5 cm wide, rounded or pointed at the apex, gradually or 

 sometimes abruptly, contracted at the base into slender, winged petioles, 

 coarsely serrate with broad, shallow teeth for about two thirds the length 

 of the blades, usually incised above the middle and with shallow, rounded 

 or triangular lobes, or sometimes undivided, slightly scabrate above when 

 young, glabrous at maturity, firm and with veins slightly impressed above ; 

 flowers 12-15 mm in diameter, usually 6-12 in small, compact, simple or 

 slightly branched corymbs, on glabrous or sparsely villous pedicels ; stamens 

 about 20; anthers white or cream color; calyx lobes linear-lanceolate, en- 

 tire or nearly so ; fruit subglobose, 7-10 mm in diameter, dull red or russet, 

 often irregularly blotched, with thin flesh, remaining hard and dry; nut- 

 lets usually 3. 



A small tree or often an arborescent shrub, up to 5-6 m high, with 

 roughish dark gray bark and stout, ascending or spreading branches, 

 usually sparingly armed with slender thorns, or sometimes nearly unarmed. 



Crataegus Margaretta is difficult to describe because of the great varia- 

 bility in the shape and size of the leaves and fruit, but it is a well marked 

 species and it is easily recognized when once known in the field. There has 

 been considerable difference of opinion as to the relationship of this species, 

 some botanists placing it in the Punctatae group, or regarding it as the 

 type of a distinct group, but it seems most nearly related to such species 

 as Crataegus Dodgei, Crataegus chrysocarpa, and Crataegus rotundifolia, 

 and it is therefore retained in the Rotundifoliae group in this treatment. 



General and frequent in Indiana, especially in the eastern and northern 

 counties, growing in pastures, thickets, and borders of woods. In the north 

 it is usually in dry, sandy or gravelly soil or in clay on terminal moraines 

 and southward on rocky slopes. 



Southern Ont. to Iowa, southw. to Va. and Mo. 



