Crataegus 



Rosaceae r)47 



open banks and hillsides, sandy soil, Livermore, McLean County, June 2, 

 1920. 



Sw. Ind. and w. Ky. 



17. Crataegus platycarpa Sarg. (Rept. Missouri Bot. Gard. 19: 92. 

 1908.) Map 1117. Leaves mostly ovate, 2.5-6 cm long, 2-5 cm wide, acute 

 or short-acuminate at the apex, abruptly narrowed, rounded, truncate or 

 on shoots, sometimes cordate at the base, sharply serrate nearly to the 

 base, usually with 2-4 pairs of shallow, lateral lobes terminating in 

 acuminate teeth, rather thin but firm, sparingly short-villous or scabrate 

 above when young and more or less villous on the veins beneath ; petioles 

 slender, a third to half as long as the blades, generally slightly villous and 

 often beset with a few stalked glands; flowers 18-22 mm in diameter, in 

 usually 3-6-flowered, nearly simple, sparsely villous corymbs; stamens 

 about 20 or sometimes fewer; anthers red or pale yellow; fruit sub- 

 globose or depressed-globose, 12-16 mm in diameter, 10-15 mm long, bright 

 red or orange red at maturity; calyx broad, shallow, nearly sessile or 

 slightly elevated ; flesh thick, becoming succulent ; nutlets 3-5. 



A tree up to 6-7 m high, with rough, gray bark and ascending or wide- 

 spreading branches, the branchlets slender, armed with numerous long, 

 slender thorns. 



Although this species seems to agree most closely with the Pruinosae 

 group, the fleshy, bright red fruit and the slight but variable pubescence 

 of the foliage and inflorescence, so uncommon in that group, suggest that 

 it might be a hybrid between some form of the Pruinosae and Crataegus 

 mollis. See also note under Crataegus no. 23. 



Indiana specimens are from both dry and moist woodland. 



Southern Ind. to ne. Ark. 



18. Crataegus rugosa Ashe. (Crataegus onusta Ashe and Crataegus 

 superata Sarg.) Map 1118. Leaves ovate, broadly ovate or deltoid, pointed 

 or short-acuminate at the apex, rounded, truncate or subcordate at the 

 base or sometimes deeply cordate on shoots, sharply serrate nearly to 

 the base, usually with 2-4 pairs of small, lateral lobes ; petioles slender, a 

 third to two thirds the length of the blades, firm at maturity, glabrous, 

 usually yellowish green; flowers 20-22 mm in diameter, usually in 3-6- 

 flowered, glabrous, nearly simple corymbs; fruit subglobose or depressed- 

 globose, 14-17 mm in diameter, with broad, shallow, slightly elevated 

 calyx, becoming dull red, with thin flesh, remaining hard and dry ; nutlets 

 usually 4-5. 



A tree up to 6-8 m high, or often a stout arborescent shrub, with dark, 

 scaly bark and stout, ascending branches; branchlets often flexuous and 

 armed with numerous, long, stout thorns. 



Crataegus rugosa is closely related to Crataegus pruinosa and appar- 

 ently intergrades with it, although it often looks entirely distinct in its 

 broader leaves and somewhat larger flowers and fruit. 



Generally distributed but not common in Indiana; found in thickets, 

 pastures, and borders of woods, usually in well drained soil. 



N. Y. to Iowa, southw. to N. C. and Mo. 



