CRATAEGUS KEY. 



APPLE FAMILY. 



297 



Group XIII. MICROCARPAE. 



Leaves membranous, lobed ; flowers small ; stamens about 20 ; fruit small, red. Shrubs or 

 trees of the South, with grayish-brown scaly and warty bark. 



Leaves deeply lobed or cut ; styles and nutlets 2. 69. C. Marshallii. 



Leaves of the vegetative shoots only, lobed, the other leaves spatulate ; styles and nutlets 5. 



70. C. spathitlata. 



Group XIV. PARVIFOLIAE. 

 Leaves small, subcoriaceous ; corymbs i-j-flowered. Shrubs. 71. C. uniflora. 



Group XV. DOUGLASIANAE. 



Leaves subcoriaceous; petioles l A'-$4' long; corymbs many-flowered; nutlets roughly pitted on 

 the ventral faces. 72. C. Douglasii. 



Group XVI. CORDATAE. 



Leaves often conspicuously 3-s-lobed ; petioles ^'-2' long; corymbs many-flowered; fruit small, 

 scarlet ; nutlets bare at the apex. 73. C. Phaenopyrum. 



i. Crataegus Crus-Galli L. Cock-spur Thorn. Newcastle Thorn. Fig. 2335. 



Crataegus Crus-galli L. Sp. PI. 476. 1753. 

 Crataegus lucida Mill. Diet. Ed. 8, no. 6. 1768. 



A small tree, sometimes 30 high, with 

 spreading branches ; spines very numerous, 

 straight, i'-7' long. Leaves obovate to 

 elliptic, 5'-4' long, i'-ij' wide (sometimes 

 2\' wide), sharply serrate, except toward 

 the base, acute or rounded at the apex, 

 cuneate, dark green and shining above, 

 coriaceous, glabrous, or occasionally 

 slightly pubescent, glandless; corymbs gla- 

 brous, or occasionally pubescent; flowers 

 about 8" broad; stamens 10-20; anthers 

 usually pink ; calyx-lobes lanceolate ; acumi- 

 nate, entire; styles and nutlets usually 2; 

 fruit ellipsoid-ovoid to subglobose, about 

 5" thick, greenish to red; flesh hard and 

 dry. 



Sandy soil ; northern New York to On- 

 tario, eastern Kansas, south through western Connecticut to Georgia, "introduced near Montreal, 

 about Lake Champlam and on Nantucket Island. An extremely variable species for which many 

 names have been proposed. May-June ; fruit ripe October. Red haw. Thorn-apple, -bush or -plum. 

 Pin-thorn. Hawthorn. , 



2. Crataegus berberifolia T. & G. Barberry-leaved Haw. Fig. 2336. 



Crataegus berberifolia T. & G. Fl. N. Am. i : 469. 1840. 

 Crataegus Engelmannii Sarg. Bot. Gaz. 31: 2. 1901. 



A small tree, sometimes 30 high, with spreading 

 branches and a broad crown, the spines occasional ; 

 twigs pubescent, becoming glabrous. Leaves oblong- 

 cuneiform, spatulate or obovate, rounded or acute at 

 the apex, cuneate, serrate towards the apex, f'-2*' long, 

 \'-\V wide, rough-pubescent above, white-pubescent or 

 tomentose beneath (in northern forms less pubescent 

 than in southern) ; corymbs densely villous ; flowers 

 about 8" broad; stamens 10-20; anthers yellow or pink; 

 styles and nutlets 2 or 3; calyx-lobes entire, slightly 

 pubescent, fruit subglobose to short-ellipsoid, about 5" 

 thick; yellow, orange or red, slightly pubescent. 



Western Kentucky to Missouri and the Gulf states. 

 May ; fruit ripe October. 



