10 JOURNAL OF THE ARNOLD ARBORETUM [vol. hi 



is best distinguished, also indicates its relationship with C. apii folia. 

 From that species it differs in its larger more pubescent only occasionally 

 lobed leaves often cuneate at base in its more pubescent corymbs of 

 larger flowers with a more pubescent calyx, and in its larger fruit. The 

 pubescence of C. not ha, although less dense is in character and persis- 

 tency that of C. brachyphylla; the larger rarely lobed leaves, the larger 

 flowers and fruit and the nearly unarmed branches may also be due to 

 the influence of that species. Five individuals are now known, one a 

 solitary tree and the other in a group. They all grow in the immediate 

 vicinity of their supposed parents. If C. notha is a hybrid, and there 

 seems to be good reason for the belief, it is a plant of unusual interest, 

 showing as it would the possibility of crossing species of two as distinct 

 groups of the genus as are now recognized. It would be, too, the only 

 hybrid Crataegus which has been found in North America. 



Crataegus brachycantha f. leucocarpa, n. forma. 



Differing from the type only in the white or pale straw-colored fruit 

 marked by dark dots. 



Louisiana. Natchitches Parish, Natchitoches, E. J. Palmer, No. 

 8719 (12) September 28, 1915 (type). 



Crataegus nuda (§Macracanthae), n. sp. 



Leaves ovate to obovate, acute and often abruptly short-pointed at 

 apex, gradually narrowed and cuneate at base, sharply and often doubly 

 serrate often to below the middle, thin, glabrous, yellow-green above, 

 paler below, 5-8 cm. long, 3-4 cm. wide, with a thin midrib and 6 or 7 

 pairs of slender primary veins; petioles slender, glabrous, slightly wing- 

 margined, 1-1.5 cm. in length; leaves on vigorous shoots thicker, more 

 coarsely serrate, to 7 or 8 cm. long and 4 cm. wide, with stouter petioles 

 often winged to the base. Flowers appearing in the Arboretum in June 

 (June 7, 1913, June 20, 1917), 1.5 cm. in diameter, on slender glabrous 

 pedicels in wide compact many-flowered corymbs; calyx-tube narrow- 

 obconic, glabrous, the lobes slender, long-acuminate, entire; stamens 10, 

 anthers pale pink, soon white; styles 2. Fruit ripening the end of Sep- 

 tember, short-oblong to subglobose, bright red, about 1 cm. in diameter, 

 with thin flesh; calyx little enlarged, with a comparatively wide deep 

 cavity pointed in the bottom; nutlets 2, suborbicular, prominently ridged 

 on the back, irregularly penetrated on the inner face by wide irregular 

 depressions, 4 or 5 mm. long and broad, the narrow hypostyle extending 

 to below the middle. 



A tree 7 or 8 m. high, with slender nearly straight glabrous red-brown 



lustrous branchlets, becoming dark gray-brown and armed with numerous 



nearly straight slender spines 3-4.5 cm. in length. 



Missouri. Taney County, woods near Swan, C. S. Sargent, October 

 1899 (typo); B. F. Bush, No. 12A, September 25, 1905, Nos. 12 and 13, April 

 21 and May 16, 1907; Arnold Arboretum No. 4439 (Seed List 18), June 7 and 

 October 9, 1913, June 20 and September 24, 1917, September 29, 1900, August 1, 



