3'S 



MALACEAE. 



VOL. II. 



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



C. albicans Ashe, Journ. E. Mitch. Soc. ly 2 : 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 ovate to oblong- 

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

 cate or broadly cuneate at the base, i$'-3i' long, i\'$y 

 wide, serrate, doubly serrate or lobed, membranous, 

 glabrous or slightly pubescent when mature ; corymbs 

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

 broad; stamens 5-10; 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'-3' long. 

 Leaves broadly ovate to oval, ii'-4' long, i'-3$' 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 abor.t 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. May ; fruit ripe 

 August. 



65. Crataegus canadensis Sargent. Canadian 

 Thorn. Fig. 2399. 



Crataegus canadensis Sarg. Rhodora 3 : 73. 1901. 



A round-topped tree, sometimes 30 high, with 

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

 Leaves ovate, ii'-3' long, i'-2f 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 10'' 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, Quebec. May ; fruit ripe September. 



