462 



ROSACEAE (KOSE FAMILY) 



c. Corymbs many-flowered. 



Leaves broadest toward the apex noe. 5, 10, 49 



Leaves broadest at the middle. 



Calyx-lobes serrate ; nutlets plane no. 3, 8 



Calyx-lobes deeply serrate ; nutlets pitted 16, IT 



Leaves broadest toward the base. 



Leaves glabrous DOS. 32, 33, and 12 



Leaves pubescent 13, 14 



1. OXYACANTHAE Loud. Leaves ovate, 3-15-lobed or -cleft, acute at the 

 apex, cuneate to truncate at the base, serrate, 1-4 cm. long,' 1-4. 5 cm. wide, 

 dark green and glabrous above (when mature), paler and slightly pubescent 

 beneath (especially along the veins} ; corymbs many -flowered, glabrous ; 

 flowers about 1.5 cm. wide ; calyx lobes deltoid, entire, obtuse ; stamens about 

 20 ; anthers pink ; styles 1-2 ; fruit globose or subglobose, red, about 6 mm. 

 thick ; calyx-lobes reflexed, persistent ; flesh of fruit yellow, mealy ; nutlets 

 usually 1 ; shrubs or small trees, 5-9 m. tall, with strongly ascending 

 branches and dark brown scaly bark j thorns sharp, about 1 cm. long. 



1. C. OXYACANTHA L. (ENGLISH H.) Characters of the section. Sparingly 

 escaped from cultivation. Fl. May ; fr. Sept. (Introd. from Eu.) 



2. CRUS-GALLI Loud. Leaves obovate to elliptical, coriaceous, dark green 

 and shining above, acute or rounded at the apex, cuneate at the base; 

 petiole slightly winged above, glandless, 1-2 cm. long ; corymbs many- 

 flowered ; calyx-lobes lanceolate-acuminate, usually entire ; stamens 10-20 ; 

 anthers usually pink; fruit subcylindric-ovoid to globose, red,, the calyx 

 flattened and the flesh hard, thin, greenish ; nutlets 1-3 (in no. 4 sometimes 

 as many as 5), strongly ridged on the back; trees or shrubs, usually with 

 spreading branches forming a broad crown ; bark dark gray, scaly ; spines 

 many, strong, straight, chestnut-brown, 3-18 cm. long. 



Corymbs and leaves glabrous. 



Leaves 2-10 cm. long, l^t cm. wide ; nest of 1-2 nutlets longer than thick . 2. C. Crus-galli. 

 Leaves 2-6 cm. long, 2-5 cm. wide. 



Nutlets 2-3 ; nest of nutlets about as long as thick 3. C. pralensis. 



Nutlets 3-5 ; nest of nutlets longer than thick 4. C. Canbyi. 



Corymbs and leaves hairy. 



Leaves large, 3-9 cm. long, 2-7 cm. wide 5. C. fecunda. 



Leaves small, 2-6 cm. long, 1-4 cm. wide 6. C. berberifolia. 



2. C. Crus-galli L. Leaves 2-10 cm. long, 1-4 cm. wide, sharply serrate ex- 

 cept toward the base; corymbs glabrous ; flowers about 1.5cm. wide ; calyx-lobes 

 glabrous or slightly pubescent ; stamens about 10 ; styles 1-3 ; fruit ellipsoidal- 

 ovoid to subglobose, about 1 cm. thick, greenish to dull red ; flesh hard and dry ; 



nutlets usually 2, 8-9 mm. long, 3.5-4.5 mm. 

 thick. Sandy soil, near Montreal, L. Cham- 

 plain, Nan tucket, Mass, (where probably intro. 

 duced), Ct., the lower Hudson Valley to s. 

 Ont., s. Mich., s. e. Kan., and s. to Ga. FIG. 

 769. Var. pYRACANTHiF6LiA Ait. has more 

 acute leaves and small bright red fruit. Occa- 

 sional, n. Del. to O. Var. OIJLONGA.TA Sarg. 

 Fruit ellipsoidal, bright red ; nutlets acute. 

 Del. and e. Pa. Var. CAPILLATA Sarg. Leaves 

 thinner ; corymbs slightly pubescent ; nutlets 

 solitary. Wilmington, Del. Var. ExfcuA 

 (Sarg.) Eggleston. Fruit ellipsoidal, bright 

 crimson ; nutlets solitary. Ct. Var. PRTTNI- 

 FOLIA (Poir.) T. & G. Leaves sometimes 7 cm. 

 wide. (C. Bartramiana Sarg.) Occasional. 

 Fl. May, June ; fr. Oct. 



C. Crus-galli x macracantha Eggleston. 

 Broad-leaved forms with foliage as in var. 

 prunifolia, the corymbs pubescent, the calyx- 

 769. C Crus-galli. lobes serrate, the nutlets 2-3, their pits varying 



