ROSACES 



181 



erect brandies, and stout zigzag branchlets light green and villose early in the season, dull 

 red-brown and sparingly villose or pubescent at the end of their first year, becoming dark 

 or light gray-brown, and armed with many long straight purple shining ultimately ashy 

 gray spines li'-3j' in length. 



Distribution. Southwestern Missouri; common near Webb City, Jasper County; well 

 distinguished by the distinctly blue color of the small leaves, the dark crimson hard fruits 

 and by the remarkable development of the spines unusual in the species of this group. 



86. Crataegus arnoldiana Sarg. 



Leaves broad-ovate or rarely oval, acute, regu>rly divided above the middle into num- 

 erous short acute lobes, and coarsely doubly serrate with straight glandular teeth except 

 at the rounded truncate or occasionally cuneate base, coated with dense matted pale hairs 

 when they unfold, about half grown when the flowers open at the end of May or early in 

 June and then roughened above by stout stiff hairs and soft-pubescent below, and at ma- 

 turity thin, smooth, very dark green and lustrous above, paler below, and slightly villose 

 on the under side of the slender midrib, and of the thin prominent primary veins extending 



Fig. 438 



to the point of the lobes, 2 '-3' long and wide; petioles slender, densely villose early in the 

 season, becoming puberulous, '-!' in length; leaves at the end of vigorous shoots acute 

 or acuminate, round or obtusely cuneate at base, more deeply lobed, often 3'-4' long and 

 ;}' wide. Flowers about f in diameter, on slender pedicels, in broad many-flowered to- 

 mentose corymbs; calyx-tube broadly obconic, densely tomentose, the lobes narrow, 

 elongated, acuminate, glandular-serrate, villose on both surfaces; stamens 10; anthers, large, 

 pale yellow; styles 3-5, usually 3 or 4, surrounded at base by a broad ring of thick hoary 

 tomentum. Fruit ripening about the middle of August and mostly falling before the first 

 of September, on stout pedicels, in erect spreading or rarely drooping few-fruited villose 

 clusters, subglobose but rather longer than broad, bright crimson marked by many large 

 pale dots, villose, particularly toward the ends, with long scattered white hairs, ' long; 

 calyx little enlarged, with elongated coarsely glandular-serrate spreading lobes often de- 

 ciduous before the fruit ripens; flesh thick, bright yellow, subacid; nutlets 3 or 4, light- 

 colored, prominently ridged on the back with a high rounded ridge, about \' long. 



A tree, 15-20 high, with a short trunk 1()'-12' in diameter, stout ascending branches 

 forming a broad open irregular head, and slender conspicuously zigzag branchlets clothed 

 early in the season with long matted pale hairs, becoming dark orange-brown and very 

 lustrous before midsummer, glabrous or puberulous during their first winter, bright orange- 



