ROSACEA 



425 



surface; stamens 20; anthers pale yellow; styles 4, or usually 5. Fruit ripening about 

 the 1st of October, on stout puberulous pedicels, in drooping few-fruited clusters, 

 obovate or oblong, dull dark red, marked by small pale dots, usually slightly villose 

 or pubescent at the ends, |' long, ^' wide ; calyx enlarged, coarsely glandular-serrate, 

 with erect and incurved lobes often deciduous before the ripening of the fruit; flesh 

 thick, dry and mealy ; nutlets usually 5, or 4, thin, light brown, irregularly grooved 

 on the back, with a broad shallow groove, \' long. 



A tree, 30-40 high, with a tall straight trunk 12-18' in diameter, thick branches 

 forming a broad round-topped symmetrical head, and branchlets hoary-tomentose at 

 first, becoming light red-brown and puberulous and ultimately pale orange-brown, 

 and armed with occasional straight or slightly curved chestnut-brown bright lustrous 

 spines 1^-1^' in length. 



Distribution. Low moist ground in the neighborhood of streams; Belle Isle in 

 the Detroit liiver, Michigan, and near Chicago and Joliet, Illinois. 



58. Crataegus Arkansana, Sarg. 



Leaves oblong-ovate or oval, acute, rounded, broadly cuneate or truncate at the 

 base, usually divided above the middle into 3 or 4 pairs of short broad acute lobes, 

 and serrate sometimes to the base, with short straight glandular teeth, when the 



flowers open about the middle of May nearly one third grown and coated with soft 

 white hairs most abundant on the under surface of the midribs and veins, and at 

 maturity thick and leathery, dull dark green and glabrous on the upper surface, pale 

 yellow-green on the lower surface, 2'-3' long, l|'-2' wide, with stout light yellow 

 midribs and primary veins slightly villose below, conspicuous secondary veins 

 and reticulate veinlets, late in October and November turning bright clear yellow; 

 their petioles stout, deeply grooved, more or less winged toward the apex, glandular, 

 with minute usually deciduous dark glands, at first tomentose, ultimately glabrous 

 or puberulous, turning dark red after midsummer, I'-l^' long; on vigorous shoots 

 broadly ovate, rounded or truncate at the base, often 4' long and 3^ wide, with folia- 

 ceous lunate coarsely glandular-dentate stipules almost 1' long. Flowers nearly 1' 

 in diameter, on short stout pedicels, in broad rather compact many-flowered villose 

 compound corymbs; calyx-tube narrowly obconic, coated with long matted pale hairs, 



