fruit subglobose to obovoid, on erect pedicels, 8-13 mm. thick, bright-blue, cov- 

 ered with a glaucous bloom; nutlets 3 to 5. 



Borders of streams in rich soil in e. Tex., fruiting Aug.-Sept.; in Ark., La. 

 and Tex. 



3. Crataegus rivularis Nutt. 



Tree occasionally to 6 m. high; branchlets slender, reddish-brown, lustrous, 

 unarmed or armed with straight slender spines usually about 25 mm. long; leaves 

 lanceolate to oblong-obovate or elliptic, acute to acuminate at apex, gradually 

 narrowed to a concave-cuneate base, very finely crenately serrate above with 

 glandular teeth, about 5 cm. long and 18 mm. wide; petioles slender, slightly 

 winged at apex, about 12 mm. long; flowers about 12 mm. wide, on long slender 

 pedicels, in rather compact glabrous corymbs; sepals linear, entire or glandular, 

 glabrous on outer surface, sparingly villous on inner surface; stamens 10 to 20; 

 anthers pale rose-color; fruit short-oblong, full and rounded at the ends, dark- 

 crimson becoming black and lustrous at maturity, 8-13 mm. long; flesh thin, yellow, 

 dry and mealy; nutlets 3 to 5. 



On banks of streams in extreme n.w. Tex. and N. M. (Socorro Co.), fruiting 

 Sept.-Oct.; from s.e. Ida. to s.w. Colo., n. N. M. and Tex. 



4. Crataegus opaca H. & A. Western mayhaw, apple haw. 



Tree to 9 m. high; branchlets slender, villous-pubescent when they appear but 

 soon glabrous, armless or armed with straight chestnut-brown spines; leaves 

 elliptic to oblong-elliptic or oblong-cuneiform, acutish at apex, cuneate at base, 

 the margins essentially entire or with minute glandular teeth, densely pubescent 

 when young, at maturity dull-green above and pubescent with rusty-brown hairs 

 beneath, to 65 mm. long and 25 mm. wide; petioles slender, villous-pubescent, 

 about 7 mm. long; flowers 2 to 5 in glabrous corymbs, about 25 mm. wide; 

 sepals triangular and acute at gland-tipped apex, essentially entire; stamens 20; 

 anthers large, deep-rose-color; fruit depressed-globose, scarlet, lustrous, 12-15 mm. 

 in diameter; nutlets 3 to 5. 



Commonly in depressions that are filled with water part of the year, along 

 streams and on border of swamps in e. Tex., fruiting May-July; from Ala. to Tex. 



5. Crataegus pyracanthoides Beadle. 



Tree 8-10 m. high, with slender thorny or sometimes unarmed branchlets and 

 dark -gray scaly bark; leaves obovate to oblanceolate, pointed or rarely rounded 

 at the apex, shallowly serrate except near the base, glabrous, firm, dark-green 

 and lustrous above; flowers 1-1.3 cm. wide, mostly 5 to 8 in lax glabrous corymbs; 

 stamens 10 or 20; anthers white to pale-yellow or purplish; fruit subglobose or 

 short-oblong, 6-10 mm. thick, red, with thin mellow flesh and 2 or 3 nutlets. 

 Incl. var. uniqua (Sarg.) E. J. Palm, and var. arborea (Beadle) E. J. Palm., 

 C. uniqua Sarg., C. arborea Beadle. 



In low rich woods and wet ground along streams in e. Tex., fruiting Oct.; 

 from Ind. to Mo., s. to Fla. and Tex. 



6. Crataegus berberifolia T. & G. Bigtree hawthorn. 



Tree to 12 m. high, with a trunk about 3 dm. in diameter and branchless for 

 about 6 m. above ground, the dark bark scaly and fissured; branchlets slender, 

 dull-red-brown and slightly villous, armed with stout straight spines; leaves oblong- 

 obovate to oval, acute to acuminate at the gradually narrowed apex, cuneate at 

 base, coarsely and often doubly serrate above with glandular teeth, coriaceous- 

 lustrous and slightly roughened on the upper surface, pale-green and scabrate 

 on the lower surface, 3.5-5 cm. long, to 25 mm. wide; flowers 1-2 cm. across, in 

 slightly villous 4- or 5-flowered slender-branched compact narrow corymbs; calyx 



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