1910.] natural sciences of philadelphia. 151 



Synopsis of Groups. 



A. — Nutlets without ventral cavities (Groups Crus-galli-Anomala?). 

 B. — Nutlets with longitudinal cavities on their ventral faces (Group 

 Tomentosae). 



Crus-galli. 



Leaves subcoriaceous or less commonly thin, obovate to oblong- 

 obovate, acuminate, acute, acuminate or rounded at the apex, 

 usually serrate only above the middle, without lobes except on 

 vigorous shoots, their veins usually thin and often within the 

 parenchyma; petioles short, usually eglandular; flowers in many- 

 flowered glabrous corymbs; fruit subglobose to short-oblong or 

 oval, mostly 1-1.4 cm. in diameter; flesh thin, usually green. 

 Anthers rose color or pink. 



Leaves subcoriaceous, their veins mostly within the parenchyma; 



stamens 10; anthers dark rose color 1. C. crus-galli. 



Leaves thin, their veins more or less prominent. 



Leaves usually rounded at the apex ; stamens usually 10 ; anthers 



pink; spines few 2. C. trahax. 



Leaves acuminate at the apex. 



Stamens 10 ; calyx-lobes long, slender, entire. 



Fruit short-oblong; anthers pale pink; branchlets and 



spines olive green 3. C. olivacea. 



Fruit narrow-oval; anthers rose color; branchlets and 



spines bright chestnut brown 4. C. accincta. 



Stamens 15; calyx-lobes short, glandular-dentate; anthers 

 only faintly tinged with pink; branchlets and spines 



light brown 5. C. phlebodia. 



Anthers white or pale yellow; stamens 10 or less. 



Leaves subcoriaceous, rounded or acute at the apex; fruit narrow 

 oblong-obovate to oval; spines dark purple, 2-3 cm. in length. 



6. C. eburnea. 



Leaves thin, acute or acuminate at the apex; fruit short-oblong 



to ovate; spines light reddish brown, 4-5 cm. in length. 



7. C. aliena. 

 1. Crataegus crus-galli Linnaus. 



Spec. 476 (1753); Sargent, Silva N. Am., IV, 91, t. 178; Man., 368, f. 286; 

 Proe. Acad. Nat. Sci. Phila., 1905, 379. 



Rich hillsides, Bedford, Bedford County, B. H. Smith and C. S. 

 Sargent (No. 302), September 30, 1905, May 25, 1908; B. H. Smith. 

 September 16, 1908; also from Canada to North Carolina. 



The number 302 from Bedford represents a number of large shrubs 

 with erect branches forming narrow irregular heads. This habit is 

 quite unlike that of the typical form of Crataegus crus-galli but in other 

 respects they are similar to that species as it grows in eastern Penn- 

 sylvania. 



