1922] SARGENT, NOTES ON NORTH AMERICAN TREES, X. 183 



dark chestnut brown, lustrous and marked by pale lenticels in the autumn 

 and dull gray-brown the following year, and armed with many stout 

 straight or slightly curved chestnut brown spines 2-6 cm. in length. 



There is unfortunately no specimen in the Arboretum herbarium from 

 the tree from which this plant in the Arboretum was raised, and there are 

 no notes concerning it. I venture, nevertheless, to describe it as a new 

 species as it distinctly differs from the six species of this group previously 

 described with pubescent corymbs and yellow anthers to which it is most 

 closely related. Of these the four Louisiana species have thick coriaceous 

 or subcoriaceous oblong-obovate leaves rounded or very rarely acute at 



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apex. From C. Mohrii Beadle from western Georgia, central Alabama 

 and eastern Mississippi, with obovate to rhombic usually acute leaves it 

 differs in its larger flowers and fruit, in its densely villose corymbs and young 

 branches, and in its more pubescent leaves. From C insignis Sargent 

 from the neighborhood of Kahokia and East St. Louis, Illinois, it differs 

 in the shape of its less coarsely serrate leaves, smaller flowers in much more 

 villose corymbs and smaller fruit. 



Crataegus ohioensis (§ Crus-galli) n. sp. 



Leaves oblong-obovate, acute and short-pointed or acuminate at apex, 

 gradually narrowed and cuneate at base, finely and often doubly serrate 

 usually only above the middle with straight teeth; more than half grown 

 when the flowers open, and then glaucous below and glabrous, and at 

 maturity thin, dark yellow-green, lustrous above, 5-8 cm. long, 1.8-4 cm. 

 wide, with a thin midrib and slender prominent primary veins; petioles 

 stout, grooved on the upper side, wing-margined nearly to the base, 6-10 

 mm. in length; leaves on vigorous shoots oblong-obovate to elliptic, 

 rounded or acute at apex, coarsely serrate. Flowers opening from the 

 20th to the end of May, 1.3-1.5 cm. in diameter, on slender pedicels, in 

 wide many-flowered slightly villose corymbs, their bracts and bractlets 

 slender, elongated, glandular; calyx-tube narrow-obconic, glabrous, the 

 lobes slender, acuminate, entire, glandular-villose near the apex, glabrous; 

 stamens 20, anthers pale pink; styles 2-5. Fruit ripening at the end of 

 September or early in October, ellipsoidal to obovoid, reddish green, 

 dotted, 1-1.5 cm. long, 7-8 mm. in diameter, and crowned with the en- 

 larged erect persistent calyx-lobes, the cavity deep and narrow; flesh hard 

 and dry; nutlets 2-5, rounded at the ends, prominently ridged on the 

 back, 5-7 mm. long, 4-5 mm. wide, the narrow dark hypostyle extending 

 to just below the middle. 



A tree sometimes 10 m. high, with a stout trunk often divided into 

 several stems, a broad round-topped head of spreading light green 

 branches and slender glabrous branchlets gray-green when they first 

 appear, becoming reddish brown in their second year and armed with 

 occasional slender nearly straight chestnut-brown lustrous spines 3-4 

 cm. in length, persistent and compound on old branches and trunks. 



