ORDER 4L ROSACES. Ill 



persistent calyx and disk. 5 b Armed with thorns. Lvs. simple, often 

 lobed. Bracts subulate, deciduous. Fls. coryuibous, white or purplish. 

 Corymbs 6-30-flwd., appearing with the leaves. Fruit red or yellowish. . .(a) 



a Villous or pubescent. Leaves plicate or sulcate along the veins Nos. 1, 2 



a Pubescent. Leaves plain, not at all plicate, cleft or not NOB. 3, 4 



a Glabrous throughout. b Leaves abrupt at base, lobed, petioled Nos. 57 



b Leaves attenuate at base, seldom lobed Nos. 8, 9 



Corymbs 1-6-flowcred, c appearing before the downy leaves No. 10 



c appearing with the leaves, d pubescent No. 11 



d glabrous Nos. 12, 13 



1 C. tomeiitosa L. Slack Thorn. Lvs. broad-ovate or oval, abrupt at base, doubly 



serrate or cut-lobed, villous beneath when young, and plicate ; fls. large, in compound 

 pubescent corymbs ; fruit oval, large (S"), 2-5-seeded, red. Can. to Ky. and Car. Mts. 

 15 2C. Flowers white, April, May. Fruit July, Aug. Varies greatly. 



/3. plicata. Lvs small, glabrous, strongly plicate. Vt., N. H., N. Y. 



y. pyri folia, Lvs. elliptic, acute at base, thinly pubescent. Styles 3. W. 



8. flabellata. Lvs. fan-shaped ; corymbs glandular-pubescent. W. 



inollis. Lvs. large, soft-villous, subcorclate, many-lobod ; corymbs canescently- 

 villous ; fruit downy when young. Ohio to Iowa. 



2 C. puiictata Jacq. Lvs. cuneiform-obovate, doubly and often incisely serrate, entire 



at base, and narrowed to a short, winged petiole, veins straight and prominent, co- 

 rymbs villous-downy ; styles 3 ; fruit globous, punctate. Woods. 12 25f. April- 

 June. (See Addenda,.) 



3 C. arboresceiis Ell. Thornless ; Ivs. lanceolate, acute at each end, deeply serrate ; 



calyx hairy ; segments subulate, obtuse, entire ; corymbs very numerous ; styles 5 ; 

 fruit ovoid, red, 3". Ga. Fla. and W. 20 30f. March, April. 



4 C. apiilolia MX. Thorny. Lvs. deltoid, truncate at base, cut-lobed and toothed ; 



petioles slender ; styles 2 or 3. Woods, S. 8 12f. March, April. 



5 C. Oxyacantha L. Hawthorn. Lvs. wedge-obovate, 3-5-lobed at apex ; corymbs 



glabrous, white to purple ; styles 13 ; fruit small, red. Hedges, &c. 8 18f. 



6 C. cocci uea L. White Thorn. Lvs. broadly ovate, acutely serrate, 7-9-lobed (lobes 



shallow), thin, abrupt at base ; petioles long, slender, and (with the calyx) subglandu- 

 lar; styles 3 5. Thickets: common. 10 20f. May. 



7 ('. cordata Ait. Washington Thorn. Lvs. cordate-ovate, somewhat deltoid, in- 



cisc'ly and often deeply 3-5-lobed, serrate, with long petioles ; sep. short ; sty. 5 ; fr. 

 small, globous-depressed. Banks, Va. to Fla. 15201'. 



8 C. Crus-galll L. Cock-spur Thorn. Lvs. obovate-cuueiform, tapering to a short 



petiole, serrate, coriaceous, shining above ; spines very long; corymbs glabrous ; eep. 

 lanceolate, subset-rate : styles 1 (2 or 3). Thickets. 10 20f. Fruit pyriform. June. 



9 C. spatli.ula.ta MX. Lvs. small, coriaceous, shining, oblong-spatulate, attenuated 



to the subsessile base, crenate above, sometimes lobed ; corymbs numerous, lateral, 

 20-25-llowered ; sepals very short ; fruit very small, scarlet. South. 10 15f. June. 



10 <' ajstivalis T. & G. Apple Haw. Young Ivs. rust-downy, older smooth above, 

 elliptic, repaud, short-stalked ; corymbs glabrous, 2-5-flowered ; fruit large (8 9"), 

 globular, red. Wet shores, S. 20 3Uf. Fruit pleasant, in May. (See Addenda.) 



11 C. parviflora. Ait. Thorns straight and slender; Ivs. cuneate-obovate, subses- 

 eile ; lit*, subsolitary, villous-tomentous ; sep. incised, leafy, as long as the petals ; sty. 

 5; fr. large, roundish, yellowish. Sanely woods, N. J. and S. 4 7f. April, May. 



12 !. flava Ait. Summer Haw. Thorns straight or arcuate; Ivs. rhombic-obovate, 

 attenuate into a glandular petiole; corymbs 1 (often 2 or 3)-flowered ; styles 4 or 5 ; 

 fruit large, pear-shaped. Ya. to Fla. 15 25f. April, May. 



13 C. viridls L. Thorns few and short; Ivs. roundish or oval, acute at each end, 

 sharply and doubly toothed above: petioles glandless ; corymbs :i-G-llowcred ; styles 

 2 or 3; fruit lai^e, globular. Iowa to Fla. 12 ISf. April, May. 



