ROSACES 



453 



erect and spreading branches forming an open irregular head, and stout slightly zigzag 

 glabrous branchlets dark olive-green tinged with red when they first appear, dark dull red- 



Fig. 409 



dish brown or purple and marked by small pale lenticels at the end of their first season, 

 becoming light grayish brown in their second year, and armed with numerous stout nearly 

 straight dark purple lustrous spines 2|'-3' in length. 



Distribution. Gravelly banks of small streams near Monteer, Shannon County, and at 

 Carl Junction, Jasper County, Missouri. 



VI. SILVICOLJE. 



Medioximce Sarg. 



CONSPECTUS OF THE ARBORESCENT SPECIES. 



Fruit on short erect pedicels; leaves rounded or occasionally slightly cordate at base. 



58. C. drymophila (C). 

 Fruit on elongated drooping pedicels. 



Leaves truncate, cordate or rounded at base; anthers, pale rose. 59. C. diffusa (A). 



Leaves cuneate or rounded at base; anthers, dark purple. 60. C. luxuriosa (A). 



58. Crataegus drymophila Sarg. 



Cratagus silvicola Beadl. 



Leaves ovate, acute or acuminate at apex, rounded at the entire base, sharply and often 

 doubly serrate above with gland-tipped teeth, and slightly and irregularly divided into short 

 acute lateral lobes, when they unfold dark red and coated with short soft pale hairs most 

 abundant on the upper surface, about half grown when the flowers open at the end of April 

 and then nearly glabrous, and at maturity thin, dark yellow-green and smooth or scabrate 

 above, pale and glabrous below, or occasionally villose along the under side of the slender 

 midrib, and of 3 or 4 pairs of thin primary veins extending to the point of the lobes, about 

 2' long and l^'-lf wide; petioles slender, glandular, about 1' in length; leaves at the 

 end of vigorous shoots often deltoid, truncate or cordate at base, more coarsely serrate, 

 more deeply lobed, and often 2|' long and wide. Flowers about ' in diameter, on slender 

 pedicels, in compact few-flowered thin-branched glabrous corymbs, with linear glandular 

 bright red caducous bracts and bractlets; calyx-tube narrowly obconic, glabrous, the lobes 

 gradually narrowed, acuminate, glabrous, entire or glandular-serrate; stamens 10; anthers 

 large, dark rose color; styles 3-5, surrounded at base by a narrow ring of pale hairs. Fruit 

 ripening at the end of September and soon falling, on short pedicels, in erect few-fruited 

 clusters, subglobose and often a little broader than long, red or greenish yellow, with a rosy 



