3o6 



MALACEAE. 



Vol. II. 



Crataegus chrysocarpa Ashe. Round-leaved Thorn. Fig. 2361. 



Mespilus rotundifolia Ehrh. Beitr. 3: 30. 1788. 

 Crataegus rotundifolia Borckh. in Roem. Arch, i' : 87. 



1798. Not Lam. Ency. i: 84. 1783. 

 Crataegus chrysocarpa Ashe, Bull. N. Car. Agri. Coll. 



175 ; 1 10. 1900. 

 C. sheridana A. Nelson, Bot. Gaz. 34: 370. 1902. 

 C. Doddsii Ramaley, Bot. Gaz. 46 : 5 : 381. 1908. 



A beautiful round-topped shrub, or a tree occa- 

 sionally 25° high, with numerous spines, l'-3' long. 

 Leaves ovate-orbicular or obovate, li'-a' long, i'-2i' 

 wide, acute at the apex, broadly cuneate at base, 

 doubly serrate with rather coarse teeth and with 3 

 or 4 pairs of acute lobes, subcoriaceous, dark yellow- 

 green and shining above, slightly pubescent or gla- 

 brous; corymbs pubescent or glabrous; flowers 7" or 

 9" broad; stamens 5-10; styles and nutlets usually 

 3 or 4; calyx-lobes lanceolate, acuminate, usually 

 entire but glandular-margined ; fruit depressed- 

 globose to short-ovoid, about 5" thick, red; flesh 

 soft; calyx-lobes reflexed. 



Nova Scotia and New Brunswick to Saskatchewan, 

 south to North Carolina, Nebraska, and in the Rocky 

 Mts. to New Mexico. May ; fruit ripe August-Sep- 

 tember. 



28. Crataegus Jackii Sargent. 

 Fig. 2362. 



Jack's Thorn. 



C. Jackii Sarg. Rhodora 5 : 162. 1903. 



C. rotundata Sarg. Ont. Nat. Sci. Bull. 4: 61. 



1908. 



A round-topped shrub, sometimes 15° high. Spines 

 numerous, lY-iV long; leaves ovate-orbicular to obovate, 

 acute at the apex, cuneate or rounded at the base, ii'-2i' 

 long, i'-2' wide, doubly serrate, lobes very shallow, dull 

 dark green above, slightly pubescent becoming glabrate 

 above, paler and glabrous beneath ; corymbs slightly vil- 

 lous ; flowers io"-i2" broad ; calyx glabrous, its lobes 

 sharply glandular-serrate ; stamens S-io ; anthers yellow ; 

 styles and nutlets 2 or 3 ; fruit ovoid-ellipsoid. S"-8" thick, 

 dull dark red, prominently angled ; flesh thick, reddish, 

 edible. 



Isle of Montreal to southern Ontario. May; fruit ripe Sep- 

 tember. 



29. Crataegus ovata Sargent. Ovate- 

 leaved Thorn. Fig. 2363. 



Crataegus ovata Sarg. Man. Trees 402. 1905. 



A tree, sometimes 30° high, with yellow, 

 scaly, bark similar to that of a young Platanus, 

 the spines l' long. Leaves ovate-elliptic or 

 obovate, i}'-2f' long, J'-2' wide, obtuse or 

 acute at the apex, broadly cuneate or rounded 

 at the base, coarsely serrate or doubly serrate, 

 often with irregular crenate lobes towards the 

 apex, dark green, shining and glabrous above, 

 paler beneath, membranous ; corymbs glabrous; 

 flowers about 6" broad; stamens about 20; 

 styles and nutlets usually S ; calyx -lobes lanceo- 

 late, entire ; fruit globose or compressed- 

 globose, yellow to orange-red, 3" or 4" thick, 

 calyx-lobes appressed, usually deciduous. 



River bottoms, western Kentucky and eastern 

 Missouri. April-May ; fruit ripe October. 



