3i8 



MALACEAE. 



Vol. II. 



63. Crataegus albicans Ashe. Tatnall's Thorn. Fig. 2397. 



C. albicans Ashe, Journ. E. Mitch. Soc. 17^: 20. July 1901. 

 C. Tatnalliana Sarg. Bot. Gaz. 35: 106. Feb. 1903. ' 



C. polita Sarg. Rhodora 5: in. April 1903. 



A shrub or small tree, sometimes 20° high, with 

 spreading branches. Leaves broadly Qvate to oblong- 

 ovate, acute or acuminate at the apex, cordate, trun- 

 cate or broadly cuneate at the base, il'-^l' long, ll'-^l' 

 wide, serrate, doubly serrate or lobed, membranous, 

 glabrous or slightly pubescent when mature; corymbs 

 many-flowered, glabrous to villous ; flowers 8"-io" 

 broad; stamens S-io; styles and nutlets 3-5; fruit sub- 

 globose to short-ellipsoid-pyriform, glabrous or villous, 

 dark red, 5"-8" thick; calyx-lobes deciduous; flesh 

 thick, edible. 



Western New England to southern Michigan, south to 

 Delaware and in the mountains to northeastern Tennessee. 

 May ; fruit ripe September. 



64. Crataegus Arnoldiana Sargent. Arnold's Thorn. Fig. 2398. 



C. Arnoldiana Sarg. Bot. Gaz. 31 : 221. 1901. 



A tree, sometimes 20° high, with ascending branches 

 forming a broad crown ; spines numerous, 2'-^' long. 

 Leaves broadly ovate to oval, ii'-4' long, i'-3i' wide, 

 acute at the apex, broadly cuneate to truncate at the 

 base, serrate or doubly serrate with broad shallow 

 acuminate lobes, tomentose, becoming scabrous above, 

 subcoriaceous ; corymbs many-flowered, tomentose ; 

 flowers about 10" broad ; stamens about 10 ; anthers 

 yellow ; styles and nutlets 4 or 5 ; fruit globose or sub- 

 globose, 8"-io" thick, bright crimson, slightly pubes- 

 cent; calyx-lobes but slightly swollen, spreading; flesh 

 thick, juicy and edible. 



Eastern Massachusetts and Connecticut. 

 August. 



May ; fruit ripe 



65. Crataegus canadensis Sargent 

 Thorn. Fig. 2399. 



Crataegus canadensis Sarg. Rhodora 3 



Canadian 



73- 



1901. 

 high, 



with 



A round-topped tree, sometimes 30° 

 spreading branches, and numerous thorns i'-2j' long. 

 Leaves ovate, il'-3' long, i'-2j' wide, acute at the 

 apex, broadly cuneate to truncate at the base, ser- 

 rate or doubly serrate with acute lobes toward the 

 apex, tomentose, becoming scabrate above, subcoria- 

 ceous ; corymbs many-flowered, tomentose ; flowers 

 about iC' broad; stamens about 20; anthers yellow; 

 styi'- and nutlets 4 or 5 ; fruit short-ellipsoid to sub- 

 globose, crimson, S"-8" thick, slightly tomentose, 

 calyx-tube rather prominent, the lobes spreading; 

 flesh thick, edible. 



About Montreal, Queljec. May ; fruit ripe September. 



