536 Rosaceae Crataegus 



Leaves with the terminal lobe wedge-shaped and usually conspicuously elongated; 



fruit 10 mm or less in diameter 16. C. Gattingeri, p. 546. 



Leaves scabrate above when young and usually slightly villous on the veins beneath; 

 fruit globose or depressed-globose, becoming slightly mellow, orange red at 



maturity 17. C. platycarpa, p. 547. 



Leaves of flowering branches broadly ovate or deltoid-ovate, truncate or cordate at 



the base, often isometric or broader on shoots, usually yellow green 



18. C. rugosa, p. 547. 



Stamens 10 or fewer; fruiting calyx small and sessile; leaves scabrate above when 

 young, glabrous beneath 19. C. prona, p. 548. 



VIII. COCCINEAE Loud. 



Leaves of flowering branches mostly ovate or broadly ovate, longer than wide, abruptly 

 narrowed or rounded at the base, glabrous or nearly so at maturity; fruit obovoid 

 or nearly globose, 10-14 mm in diameter. 

 Flowering corymbs and petioles villous; corymbs usually compound and many- 

 flowered 20. C. pedicellata, p. 548. 



Flowering corymbs and petioles glabrous; corymbs often nearly simple and few- 

 flowered 20a. C. pedicellata var. albicans, p. 549. 



Leaves of flowering branches broadly ovate or deltoid-ovate, often isometric, truncate 

 or subcordate at the base, permanently pubescent at least on the veins beneath; 

 fruit subglobose, 14-20 mm in diameter 21. C. Putnamiana, p. 549. 



IX. MOLLES Sarg. 



Leaves of flowering branches ovate, oblong-ovate or oblong-elliptic, pointed or acuminate 

 at the apex, 3-6 cm wide, scabrate or villous above, pubescent at least on the 

 veins beneath, with stout, villous petioles; fruit 15-20 mm in diameter, pubescent. 



Leaves of flowering branches mostly rounded or truncate at the broad base 



22. C. mollis, p. 550. 



Leaves of flowering branches mostly oblong-elliptic, narrowed or acute at the base. 



22a. C. mollis f. dumetosa, p. 550. 



Leaves of flowering branches broadly oval to suborbicular, mostly obtuse or rounded at 

 the apex, 2.5-4 cm in width; petioles more slender; fruit glabrous or nearly so. 

 23. C. Kelloggii, p. 551. 



X. CORDATAE Beadle 



Leaves glabrous, ovate or deltoid-ovate in outline, rounded to cordate at the base, 

 usually with one or two pairs of acute, spreading lobes; flowers small, appearing 



after the leaves; fruit 5-7 mm in diameter, bright red, with deciduous calyx 



24. C. Plwenopyrum, p. 551. 



XL MACRACANTHAE Loud. 



Leaves of flowering branches mostly ovate or elliptic, 3-4 cm wide; flowering corymbs 



villous or glabrate; fruit bright red, mellow or succulent at maturity. 



Mature leaves firm but not subcoriaceous, veins slightly impressed above; flowering 



corymbs villous or tomentose; fruit obovoid to nearly globose, orange red or 



scarlet; thorns usually scattered and slender or branches nearly unarmed.. ... 



25. C. Calpodendron, p. 552. 



Mature leaves subcoriaceous, veins conspicuously impressed above, becoming glabrous 

 above and glabrate or finely pubescent along the veins beneath; flowering 

 corymbs glabrate or slightly villous; fruit subglobose, dark red, becoming suc- 

 culent; thorns usually numerous, long and stout 26. C. succulenta, p. 552. 



Leaves of flowering branches mostly obovate or elliptic, 2-3 cm wide; flowering corymbs 

 villous or tomentose; fruit ovoid or subglobose, remaining hard, pale red or yellow 

 green at maturity 27. C. incaedua, p. 553. 



