182 JOURNAL OF THE ARNOLD ARBORETUM [vol. hi 



Crataegus araioclada Sarg. Upland woods, Natchitoches, Natchi- 

 toches Parish. 



Crataegus blanda Sarg. Near Minden, Webster Parish (B. F. Bush, 



No. 633) . 



xGleditsia texana Sarg. Waste ground near the Red River, Shreveport. 



Caddo Parish. 



Zanthoxylum clava-H erculis L. Small tree in sandy soil or on river 



banks. Marchouse, St. Landry Parish and West Feliciana Parish. 



NOTES ON NORTH AMERICAN TREES, X 1 



C. S. Sargent 



NEW SPECIES AND VARIETIES OF CRATAEGUS 



Crataegus swanensis (§ Crus-galli), n. sp. 



Leaves oblong-obovate, acute and short-pointed at apex, gradually 

 narrowed and cuneate at the acute base and finely serrate above the 

 middle with acute straight or slightly incurved teeth; fully grown when 

 the flowers open and then glabrous above and slightly villose below along 

 the midrib and primary veins, and at maturity thin, dull yellow-green on 

 the upper surface, slightly paler on the lower surface, 3-5 cm. long and 

 2-2.5 cm. wide, with a slender midrib glabrous or slightly pubescent 

 below and thin conspicuous veins impressed on the upper side of the leaf; 

 petioles slender, slightly wing-margined at apex, densely villose early in 

 the season, becoming pubescent, 5-10 mm. in length; leaves on vigorous 

 shoots broad-obovoid to oval, often slightly lobed, more coarsely serrate, 

 5-6 cm. long and 3.5-4 cm. wide. Flowers opening early in June, 1.2-1.5 

 cm. in diameter, on long slender villose pedicels, in many-flowered globose 

 villose corymbs; calyx-tube narrow-obconic, thickly covered with matted 

 pale hairs, the lobes separated by wide sinuses, gradually narrowed from 

 the base, slender, long-acuminate, laciniately glandular-serrate below the 

 middle, slightly villose on the outer surface, densely covered with pale 

 hairs on the inner surface; stamens 15; anthers yellow; styles 2 or 3. 

 Fruit ripening the middle of October, on stout villose pedicels in pendent 

 clusters, ellipsoidal or subglobose, scarlet, 1 cm. long and 8-9 mm. in 

 diameter, the calyx little enlarged with a wide deep cavity pointed in the 

 bottom and with spreading and reflexed persistent lobes; flesh thin, dry 

 and mealy; nutlets 2 or 3, rounded at the ends, rounded or occasionally 

 grooved on the back, 6-8 mm. long and 5-6 mm. wide, the narrow brown 

 hypostyle extending to the middle. 



A tree raised at the Arnold Arboretum from seeds (Seed List No. 2265) 

 collected in 1906 by B. F. Bush at Swan, Christian County, Missouri, 

 with stout branchlets densely villose early in their first season, becoming 



i Forpart ix see p. 1 



