ORDER 44. ROSACE^E. Ill 



persistent calyx and disk. 5 1> Armed with thorns. Lvs. simple, often 

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

 Corymbs 6-39-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 Nos. 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-flowered, c appearing before the downy leaves No. 10 



c appearing with the leaves, d pubescent No. 11 



d glabrous Nos. 12, 13 



1 C. tomentosa L. Black 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 (8"), 2-5-seeded, red. Can. to Ky. and Car. Mts. 

 15 25f. Flowers white, April, May. Fruit July, Aug. Varies greatly. 



j3. plicata. Lvs small, glabrous, strongly plicate. Vt., N. H., N. Y. 



y. pyrifblia. Lvs. elliptic, acute at base, thinly pubescent. Styles 3. *W. 



5. flabcUhta, Lvs. fan-shaped ; corymbs glandular-pubescent. W. 



niollis. Lvs. large, soft-villous, subcordate, many-lobed ; corymbs canej>rently- 

 villous ; fruit downy when young. Ohio to Iowa. 



2 C. punctata 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 villou^-dowuy ; styles 3; fruit globous, punctate. Woods. 12 25f. April- 

 June. (See Addenda.) 



3 C. arborescens 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. apiifolia MX. Thorny. Lvs. deltoid, truncate at base, cut-Tobed and toothed ; 



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



5 C. Oxyacantha L. Hawthorn. Lvs. wedge-obovate, 3-6-lobed at apex ; corymbs 



glabrous, white to purple ; styles 1 3 ; fruit small, red. Hedges, &c. 8 18f. 



6 C. coccinea 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. 



1 C. cordata Ait. Washington Thorn. Lvs. cordate-ovate, somewhat deltoid, in- 

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

 small, globous-depressed. Banks, Va. to Fla.' 15 20f. $ 



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



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

 lanceolate, subserrate ; styles 1 (2 or 3). Thickets. 10 20f. Fruit pyriform. June. 



9 C. spathulata MX. Lvs. small, coriaceous, shining, oblong-spatulate, attenuated 



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

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



IOC. aestivalis T. & G. Apple Haw. Young Ivs. rust-downy, older smooth above, 

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

 globular, red. Wet shores, S. 20 30f. Fruit pleasant, in May. (See Addenda.) 



11C. parvffl-ora Ait. Thorns straight and slender; Ivs. cuneate-obovate, snbses- 

 sile ; fls. subsolitary, villous-tomentous ; sep. incised, leafy, as long as the petals ; sty. 

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



12 C. 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. Va. to Fla. 15 25f. April, May. 



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

 sharply and doubly toothed above; petioles glandless ; corymbs 3-6-flowered ; styles 

 2 or 3 ; fruit iarga, globular. Iowa to Fla. 12 18f. April, May. 



