Crataegus Key. APPLE FAMILY. 295 



Fruit glabrous ; calyx-lobes entire. 



Fruit ellipsoidal ; nutlets usually j or 4. 



Leaves bright yellow-green, slightly impressed-veined above ; fruit ellipsoidal. 



8. C. cuncifoniiis. 

 Leaves dull gray-green, strongly impressed-veined above ; fruit short-ellipsoidal. 



Leaves obovate, narrow. 9. C. pujictata. 



Leaves oblong, broad. 10. C.Joncsae. 



Fruit globose. 



Nutlets 2 or 3. 11. C.Margarelta. 



Nutlets 4 or 5. ' 12. C. suborbiculata. 



Fruit villous ; calyx-lobes glandular-serrate. 13. C. collina. 



Group III. Macracanthae. 



Leaves rhombic-elliptic; petioles J4'-M' long; corymbs many-flowered, pubescent; calyx-lobes 

 lanceolate, acuminate, glandular-laciniate, villous ; fruit red, its flesh glutinous ; calyx-lobes reflexed. 

 Leaves dark green, glabrous and shining above, coriaceous. 



Fruit sometimes 8" thick; stamens usually 10; leaves and anthers large. 14. C. succulenta. 



Fruit sometimes 6" thick : leaves and anthers small ; stamens 15-20. 15. C. ncoftuvialis. 

 Leaves gray-green, pubescent and dull above, subcoriaceous. 



Leaves rhombic-ovate, lobed. 16. C.Cal/iodcndioii. 



Leaves oval, more entire. 17. C. globosa. 



Group IV. Brainerdianae (Anomalae). 

 Leaves elliptic to ovate, subcoriaceous to membranous; petioles ^'-ij'2' long: corymbs many- 

 flowered ; calyx-lobes lanceolate-acuminate, glandular-serrate ; fruit red ; calyx-lobes reflexed ; flesh 

 thin, succulent or glutinous. 

 Fruit and corymbs pubescent ; calyx-lobes sharply glandular-serrate. 



Leaves serrate; styles and nutlets 2 or 3. 18. C. perlomentosa. 



Leaves dentate; styles and nutlets 4 or 5. 19. C. VaiHae. 



Fruit and corymbs glabrous; calyx-lobes remotely glandular-serrate. 20. C. Brainerdi. 



Group V. ROTUNDIFOLIAE. 



Leaves elliptic-ovate to orbicular; subcoriaceous; petioles '4'-^' long; young foliage usually 

 yellow-green ; corymbs many-flowered ; calyx-lobes usually lanceolate-acuminate ; fruit red, the flesh 

 soft ; calyx-lobes reflexed. 

 Leaves longer than wide. 



Leaf-lobes acuminate. 21. C.laurentiana. 



Leaf-lobes acute. 22. C. luconini. 



Leaves of about the same length and breadth. 



Leaf-lobes acuminate. 23. C. irrasa. 



Leaf-lobes acute or obtuse. 



Calyx-tube prominent ; fruit subglobose. 24. C. Mncauleyae. 



Calyx-tube obscure. 



Leaves acutely lobed toward the apex ; calyx-lobes glandular-laciniate. 



25. C. Bickncllii. 

 Leaves not acutely lobed ; calyx-lobes glandular-margined only. 



Fruit pyriform, yellow-red ; flowers and fruit maturing early. 26. C. Oakesiana. 



Fruit globose, red ; flowers 3 or 4 days later. 



Fruit round in cross-section, 3"-5" thick. 27. C. chrysocarpa. 



fruit angular in cross-section, 5"-8" thick. 28. C. Jackii. 



Group VI. ViRiDES. 

 Leaves oblong-ovate to oval ; membranous, dark green, shining and glabrous above ; petioles 



%'-iJ4' long; corymbs many-flowered; calyx-lobes entire; fruit red, glabrous; flesh hard, edible. 



Leaves ovate ; lobes shallow ; fruit yellow-red. 29. C. ovata. 

 Leaves oblong-ovate ; lobes deep. 



Fruit bright red, glaucous, 2" or 3" thick ; leaves serrate. 30- C". 7nndis. 



Fruit dull dark red, 3" or 4" thick; leaves coarsely serrate. 31- C.nitida. 



Group VII. Intricatae. 

 Leaves elliptic to ovate, subcoriaceous, the teeth gland-tipped ; petioles ;i'-i M' long ; young 

 foliage usually yellow-green ; corymbs 3-7-flowered ; bracts glandular, very deciduous ; calyx-lobes 

 lanceolate-acuminate, generally strongly toothed toward the apex ; fruit greenish-yellow to reddish- 

 brown, bluntly angular; calyx-tube prominent, the lobes reflexed; flesh hard, thick. 

 Foliage and fruit pubescent ; corymbs villous. . 



Fruit globose, greenish- to reddish-brown. 3,2. C.inlricata. 



Fruit ellipsoid or pyriform, yellow. 33- C.Slonei. 



Foliage, corymbs and fruit glabrous. jv r 



Leaves entire or the lobes Crenate. 34' C. padifoha. 



Leaves lobed, the lobes acute. 



Leaves cordate. 35- C. popuhfoha. 



Leaves cuneate. 



Leaves elliptic-ovate ; fruit pyriform-ellipsoidal ; anthers small. 36. C. stramxnea. 



Leaves ovate to oval ; fruit globose or subglobose ; anthers large. 



Fruit lemon-yellow. 37- C. pollens. 



Fruit red-green to red-brown. 38. C. Boyntoni. 



