CRATAEGUS KEY. 



APPLE FAMILY. 



2 95 



Fruit glabrous ; calyx-lobes entire. 



Fruit ellipsoidal ; nutlets usually 3 or 4. 



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



8. C. cuneiformis. 

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



Leaves obovaie, narrow. 9. C. punctata. 



Leaves oblong, broad. 10. C.Joncsae. 



Fruit globose. 



Nutlets 2 or 3. n. C. M argaretta. 



Nutlets 4 or 5. 12. C.suborbiculata. 



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



Group III. MACRACANTHAE. 



Leaves rhombic-elliptic; petioles /4'-J4' 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. succidenta. 

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



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

 Leaves rhombic-ovate, lobed. 

 Leaves oval, more entire. 



1 6. C. Calpodendron. 



17. C.globosa. 



Group IV. BRAINERDIANAE (ANOMAI.AE). 



Leaves elliptic to ovate, subcoriaceous to membranous; petioles H'-iH' 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.pertomentosa. 



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



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



Group V. ROTUNDIFOLIAE. 



Leaves elliptic-ovate to orbicular; subcoriaceous; petioles ^'-2' 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. lucorum. 



Leaves of about the same length and breadth. 



Leaf-lobes acuminate. 23. C. irrasa. 



Leaf-lobes acute or obtuse. 



Calyx-tube prominent ; fruit subglobose. 

 Calyx-tube obscure. 



Leaves acutely lobed toward the apex 



24. C. Macauleyae. 



calyx-lobes glandular-laciniate. 



25. C. Bicknellii. 

 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 

 J4 /-I /4' 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. viridis. 



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 ^'-iJ4' 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. 

 Fruit ellipsoid or pyriform, yellow. 

 Foliage, corymbs and fruit glabrous. 

 Leaves entire or the lobes crenate. 

 Leaves lobed, the lobes acute. 

 Leaves cordate. 

 Leaves cuneate. 



Leaves elliptic-ovate; fruit pyriform-ellipsoidal ; anthers small. 

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

 Fruit lemon-yellow. 

 Fruit red-green to red-brown. 



32- 

 33- 



C. intricate. 

 C.Stonei. 



34 



C. padifolia. 

 35- C. populifolia. 

 36. C.straminea. 



37- C. pollens. 



38- C. Boyntoni. 



