462 



ROSACEAE (ROSE FAMILY) 



Corymbs many-flowered. 



Leaves broadest toward the apex . 

 Leaves broadest at the middle. 



Calyx-lobes serrate ; nutlets plane 



Calyx-lobes deeply serrate ; nutlets pitted 

 Leaves broadest toward the base. 



Leaves glabrous 



Leaves pubescent .... 



nos. 5, 10, 49 



no. , 8 

 816,8" 



..... nos. 32, 33, and 12 

 ......... 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; 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, (/landless, 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 c</l>/.>- 

 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, 1^4 cm. wide ; nest of 1-2 nutlets longer than thick 

 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 

 Corymbs and leaves hairy. 

 Leaves large, 8-9 cm. long, 2-7 cm. wide 

 Leaves small, 26 cm. long, 1-4 cm. wide 



2. C. < 'rnx-<j<t!l i. 



3. C. pralensi 



4. C. Canbyi. 



5. 

 6. C. 



2. C. CruB-gdlli 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 nun. 

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

 plain, Nantucket, Mass, (where probably intro- 

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

 Ont., s. Mich., s. e. Kan., and s. to Ga. Fi<;. 

 7<>0. Var. PYUACANTHIFOL1A Ait. has more 

 acute leaves and small bright red fruit. Occa- 

 sional, n. Del. to O. Var. OBLONG\TA Sarg. 

 Fruit ellipsoidal, bright red; nutlets acute. 

 Del. and e. Pa. Var. CAPILL\TA Sarg. Leaves 

 thinner ; corymbs slightly pubescent ; nutlets 

 solitary. Wilmington, Del. Yar. KXI'-.I v 

 (Sarg.) Eggleston. Fruit ellipsoidal, bright 

 crimson; nutlets solitary. Ct. Var. I'WNI- 

 H'M i \ (Poir.) T. & G. Leaves sometimes 7 cm. 

 wide. (C. Bartrmu imm Sari;-.) Occasional. 

 Fl. May. June ; fr. Oct. 



C. Crus-gAlli x macracantha Eggleston. 

 Hroad-leaveil forms with foliar- as in var. 

 j>rn nifolin, the corymbs pubescent, tin 1 calyx- 

 . C Crus-galli. lobes'serrate, the nutlets 'J- ::, their pits varying 



