1921] SARGENT, NOTES ON NORTH AMERICAN TREES, IX. 9 



but the leaves of that species are thicker, distinctly blue-green and usu- 

 ally slightly lobed, its flowers are larger and the calyx cavity of the larger 

 fruit is broader and deeper. C. lanuginosa grows on rocky hillsides in 

 open situations, and the branches of few species are furnished with such 

 long and numerous spines. 



Crataegus notha (C apiifolia X brachyphylla), n. hyb. 



Leaves broad-ovate, acute at apex, abruptly cuneate, rounded or 

 truncate at base, coarsely and sharply doubly serrate usually only above 

 the middle, and slightly and irregularly lobed, when they unfold thickly 

 covered with matted white hairs, and at maturity thin, glabrous above, 

 pubescent below, 3-4 cm. long and 2.5-3 cm. wide, with a thin midrib 

 and slender primary veins occasionally running to the sinuses as well as 

 to the points of the lobes; petioles slender, densely villose early in the 

 season, becoming nearly glabrous, 1.5-3 cm. in length; leaves on vigorous 

 shoots truncate or subcordate at base, more coarsely serrate, usually 

 3-lobed by deep narrow lateral lobes pointed in the bottom, and up to 5 

 cm. long and 5-6 cm. wide, with petioles usually about 2.5 cm. in length. 

 Flowers appearing late in March, 1.5-1.7 cm. in diameter, on slender 

 pedicels densely hoary-villose like the compact usually twelve to fifteen- 

 flowered corymbs; calyx-tube narrow-obconic, densely villose, the lobes 

 gradually narrowed from the base, acuminate, glandular, laciniately ser- 

 rate, slightly villose; stamens 20, anthers deep rose color, styles 2-4. 

 Fruit ripening the end of September, not abundant, on glabrous pedicels, 

 ovoid, bright scarlet, 10 mm. long and 6-8 mm. wide, with soft succulent 

 flesh, the calyx little enlarged with a deep narrow cavity pointed in the 

 bottom; nutlets usually 4, acute at the ends, rounded and occasionally 

 slightly ridged on the back, about 6 mm. long, 4 mm. wide. 



A tree 6 or 7 m. high, with a trunk 15-20 cm. in diameter, covered 

 with thin pale bark separating in small thin flake-like scales, stout spread- 

 ing smooth pale gray branches forming an open irregular head, and slen- 

 der slightly zigzag branchlets covered when they first appear with matted 

 white hairs, becoming glabrous or nearly glabrous and reddish brown by 

 the end of their first season and dull gray-brown the following year, and 

 unarmed or armed with an occasional slender straight chestnut brown 



spine up to at least 4.5 cm. in length. 



Arkansas. HempsteadCounty, dry gravelly hills about five miles north- 

 west of Fulton, in open Oak-woods, C. S. Sargent, April 23, 1901; B. F. Bush, No. 

 154, April 23, 1901, No. 12, April 17, 1905, Nos. 12, 12A, 12B, March 26, 1909 

 (in flower); E. J. Palmer, No. 8974 (21 A), October 19, 1915, No. 9391 (21 A), 

 No. 16333, September 9 1919, No. 20646, September 26, 1921 (type). 



Mr. Palmer, who has watched this tree for several years, suggests 

 that it is a hybrid between C. apiifolia Michaux and C. brachyphylla Sar- 

 gent, both of which are growing with it. The bark of the trunk is that 

 of C. apiifolia and the fact that a primary vein sometimes extends to the 

 base of a sinus of a leaf, the character by which the Microcarpae Group 



