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1903] CRATAEGUS IN NORTHEASTERN ILLINOIS 3S7 



hairs. Fruit obovate or rarely short-oblong, bright reddish pur- 

 ple marked by small scattered pale dots, 1-1.6^"' long, S-12"'"' 

 wide; calyx sessile, with a broad shallow cavity and spreading 

 lobes, their tips mostly deciduous from the ripe fruit; flesh thin, 

 yellow, juicy, pleasantly acid ; nutlets three to five, thin, ridged 

 on the rounded back with a low ridge, G-S"""" long. 



A tree 5-8"' in height with a trunk 1-2"^ long and 1-2'''" in diameter, cov- 

 ered with dark gray bark separating into thin plates, 2-6*^"' long and 1-2^"* 

 wide, in falling disclosing the yellow inner bark, and dividing into several 

 ascending branches forming an oblong or pyramidal crown resembling that 

 of a pear tree ; or often shrubby with numerous stems spreading into small 

 clumps; ultimate branchlets rough, zigzag, covered with small twigs, dark 

 dull red-brown and marked by small pale lenticels during their first season, 

 dark gra3--brown the following year and unarmed or armed with slender 

 nearly straight dull red-brown ultimately ashy gray spines 3-4*""" long. 

 Flowers early in May. Fruit ripens the first of September and soon falls 

 and decays. 



Dry open places, wood borders and along the margins of the high banks 

 of streams. Common and generally distributed in the neighborhood of Chi- 

 cago. Mokena, July 1900. May and September 1901, Barrington, May and 

 September 1901, Glendon Park, May and September 1901, Tinley Park, May 

 and September igoi, Joliet, May and September igoi, E, J. Hih ; Joliet, 

 //". C, Skeels, May 1902, Fort Sheridan, May and September 1902, E, /. HilL 



Crataegus cyanophylla, n. sp. — Glabrous except the up])er sur- 

 face of young leaves. Leaves oblong-ovate, acuminate, usually 

 rounded or rarely truncate or cuneate at the broad base, sharply 

 and often doubly serrate, with straight or incurved glandular 

 teeth, and more or less divided into four or five pairs of 

 spreading acuminate lobes; bright bronze-red when expanding ; 

 nearly half grown when the flowers open and then membrana- 

 ceous, pale blue-green tinged with red and roughened on the upper 

 surface by short pale hairs ; at maturity thin, smooth, distinctly 

 blue-green, darker on the upper than on the lower surface, 3-6 

 long, 3.5-5™ wide, frequently as broad as long, with thin mid- 

 ribs and very slender prominent veins extending to the points of 

 the lobes ; petioles slender, slightly grooved, sparingly glandular, 

 1-3 ^"^ in length ; stipules linear to oblong-obovate, acute, glandu- 

 lar, turning pink in fading, caducous; leaves on vigorous leading 

 shoots often elliptical, concave-cuneate at the base, long-pointed, 



cm 



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