240 



POMACEAE. 



[VOL. II. 



Leaves ovate, broadly oval or nearly orbicular in outline. 

 Foliage, pedicels and calyx glabrous or nearly so. 



Leaves mainly truncate or cordate at the base, lobed. 4. C. cordata. 



Leaves narrowed or wedge-shaped at the base. 



Leaves much incised; styles 1-3. 5. C. Oxyacantha. 



Leaves serrate or but little incised; styles mostly 5. 6. C. viridis. 



Lower surfaces or teeth of the leaves, pedicels and calyx pubescent or gland-bearing. 

 Leaves deeply pinnately incised; pome 3" long. 7. C. apiifolia. 



Leaves serrate or lobed, not deeply incised; pome 4"-i2" long. 



Leaves glabrous or nearly so, their teeth mostly tipped with small glands. 

 Leaves, or most of them, truncate or cordate at the base. 8. C. coccinea. 

 Leaves, or most of them, narrowed at the base. 



Fruit subglobose, pyriform or oval, 5" -7" in diameter; bractlets and calyx 



densely glandular. 9. C.rotundifolia. 



Fruit globose, 3"~4" in diameter; bractlets and calyx somewhat glandular. 



10. C. macracantha. 

 Leaves pubescent, especially along the veins beneath. 



Leaves broadly ovate, truncate or cordate at the base; flowers i' broad. 



n. C. mollis. 



Leaves oval, narrowed at both ends; flowers 6"-8" broad. 12. C. tomcntosa. 

 Corymbs i-7-flowered. 



Calyx-lobes not incised; petioles and leaf-serrations very glandular. 13. C. flava. 



Calyx-lobes deeply incised; petioles and leaf-serrations little or not at all glandular. 



Leaves obovate or spatulate, obtuse. 14. C. uniflora. 



Leaves oval, mostly acute at both ends. 15. C. Vailiae. 



i. Crataegus Crus-Galli L. Cockspur Thorn. Newcastle Thorn. (Fig. 1991.) 



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

 A shrub or small tree, with maximum 

 height of about 30 and trunk diameter 

 of i, the branches spreading. Thorns 

 numerous, slender, z'-tf long; leaves 

 coriaceous, shining above, dull beneath, 

 glabrous on both sides, obovate or ob- 

 lanceolate, obtuse or abruptly acumi- 

 nate at the apex, very cuneate at the 

 base, i '-2' long, sharply and somewhat 

 irregularly serrate; corymbs many-flow- 

 ered, terminating short branches; pedi- 

 cels and calyx glabrous; flowers about 

 6" broad; calyx-lobes linear-lanceolate; 

 styles usually 1-3; fruit globose or 

 slightly pear-shaped, about 3" long. 



In thickets, western Quebec to Mani- 

 toba, south to Florida arid Texas. Wood 

 hard, satiny, reddish brown. Weight per 

 cubic foot 45 Ibs. May-June. 



2. Crataegus spathulata Michx. Small- 

 fruited Haw. (Fig. 1992.) 



Mesbilus Azarolus Marsh. Arb. Am. 88. 1785. Not 



C. Azarolus L. 1753- 

 Cralaegus spathulata Michx. Fl. Bor. Am. i : 288. 1803. 



A shrub or small tree, sometimes reaching a height 

 of 25 and trunk diameter of xo 7 . Spines i / -2 / long; 

 leaves fascicled near the ends of short branches, cori- 

 aceous, shining above, rather dull beneath, glabrous 

 on both sides, spatulate, obtuse and crenate or with 

 2-3 lobes at the summit, entire and narrowly cune- 

 ate at base, almost sessile, i' long, or those of the 

 sterile branches often larger; cymes terminating 

 short branches, many-flowered; pedicels and calyx 

 glabrous; flowers about 4" broad; calyx-lobes ovate; 

 styles commonly 5; fruit red, globose, or oval-glo- 

 bose, 2 // ~3 // long. 



In thickets, Virginia to Florida, west to Missouri and 

 Texas. Wood hard, reddish brown. Weight per cubic 

 foot 45 Ibs. May-June. 



