ROSACES 



495 



ing branches forming a broad round-topped head, and slender slightly zigzag glabrous 

 light red-brown lustrous branchlets, unarmed, or armed with occasional straight 

 slender dark purple shining spines 1^'-1|' long. 



Distribution. Open pastures, Milton Township, Du Page County, and Glen 

 Ellyn and Mokena, northeastern Illinois. 



124. Crataegus vegeta, Sarg. 



Leaves elliptical, acuminate, gradually narrowed and concave-cuneate at the entire 

 base, finely often doubly serrate above, with straight glandular teeth, and slightly 

 divided above the middle into numerous short acute lobes, nearly fully grown when 



the flowers open at the end of May and then membranaceous, dark yellow-green and 

 roughened above by short rigid pale hairs and densely pubescent below, and at maturity 

 thin but firm in texture, dark dull green and scabrate on the upper surface, pale and 

 pubescent on the lower surface along the slender midribs and 5 or 6 pairs of thin 

 primary veins arching obliquely to the points of the lobes, 3' -4' long, If 2^' wide; their 

 petioles slender, broadly wing-margined at the apex, villose on the upper side early 

 in the season, becoming glabrous and rose color in the autumn, ^'-f long. Flowers 

 f'-f in diameter, on long slender villose pedicels, in usually 10-12-flowered hairy 

 compound corymbs, with linear to linear-obovate acute glandular bracts and bractlets 

 becoming reddish and mostly persistent until after the flowers open; calyx-tube nar- 

 rowly obconic, villose, the lobes slender, acuminate, glandular-serrate, villose; sta- 

 mens 20; anthers small, light pink or red; styles 2 or 3, usually 3. Fruit ripening 

 late in September, on slender elongated rigid slightly villose pedicels, in few-fruited 

 erect clusters, subglobose, scarlet, lustrous, marked by small pale dots, about ' in 

 diameter; calyx prominent, with a short tube and spreading reflexed serrate lobes; 

 flesh thin, yellow, dry and mealy; nutlets 2 or 3, %' long and nearly as broad, full 

 and rounded at the ends, prominently ridged on the back, with a high grooved ridge, 

 the ventral cavities broad and deep. 



A tree, 20-25 high, with a tall straight trunk sometimes 8' in diameter, stout wide- 

 spreading branches forming a symmetrical round-topped head, and very slender nearly 

 straight branchlets, light orange-green when they first appear, becoming bright red- 

 brown and lustrous at the end of their first season and darker the following year, 



