ROSACES 383 



glabrous, and armed with few scattered stout straight chestnut-brown ultimately 

 dull gray spines l'-2' long; or on the dry soil of low hills much smaller and gener- 

 ally 20-25 high. , 

 Distribution. Low wet woods on the borders of streams, and on dry hills in for- 

 ests of Oak and Pine; valley of the Sabine River, Texas, to western Louisiana. 



17. Crataegus tersa, Beadl. 



Leaves oblong to obovate, cuneiform, rounded and obtuse, or on leading shoots 

 acute at the apex, gradually narrowed, concave-cuueate and entire below, coarsely ser- 

 rate above, with acute or rounded teeth, when they unfold tinged with red, sparingly 

 villose above and tomentulose below, nearly fully grown when the flowers open the 

 middle of April, and at maturity coriaceous, dark green, lustrous, and glabrous 

 or scabrate above, pale and pubescent below, l^'-2' long, I'-l^' wide, with slender 

 midribs and thin primary veins, turning in the autumn yellow, orange, and brown; 

 their petioles stout, wing-margined above, at first hoary -tomentose, glabrous at ma- 

 turity, about i' long. Flowers -f ' f' in diameter, on short stout hairy pedicels, in 

 usually 8-10-flowered very compact corymbs densely clothed with long matted pale 

 hairs; calyx-tube narrowly obconic, hairy, the lobes acuminate, glandular-serrate, 



pKi.,302 



villose on the outer and slightly pilose on the inner surface; stamens 18-20; anthers 

 pale rose color, styles usually 2 or 3. Fruit ripening in October, on stout glabrous 

 stems, in compact drooping few-fruited clusters, globose to subglobose or short- 

 oblong, about I' long, dark red; calyx prominent, with enlarged erect or spreading 

 glandular-serrate lobes; flesh thin, yellow, dry and mealy; nutlets 2 or 3, mostly 

 obtuse and rounded at the ends, prominently ridged on the back, about \' long. 



A tree, sometimes 18-20 high, with a trunk G'-8' in diameter, spreading branches 

 forming a broad flat-topped head, and stout brauchlets at first pilose, becoming gla- 

 brous before autumn, and usually unarmed. 



Distribution. Upland woods near Opelousas, Louisiana. 



-h-t- Anthers yellow. 



18. Crataegus berberifolia, T. & G. 



Leaves obovate-oblong, rounded or gradually narrowed at the apex, narrowed 

 from above the middle to the cuneate entire base, and serrate above, with straight 



