ROSACES 



473 



narrow acuminate lateral lobes, unfolding with the opening of the flowers at the end of 

 April or early in May and then light yellow-green tinged with bronze color, lustrous and 

 covered above with short shining caducous white hairs and hoary-tomentose below, and at 

 maturity thin, light yellow-green and scabrate on the upper surface, paler and pubescent 

 on the lower surface, especially on the slender midrib, and 4 or 5 pairs of thin primary 

 veins extending obliquely to the point of the lobes, lf'-2|' long, and If '-2' wide; petioles 

 slender, more or less wing-margined at apex, villose early in the season, pubescent in the 

 autumn, f'-f in length; leaves at the end of vigorous shoots broad-ovate, acute, cune- 

 ate at the wide base, often 2f'-3' long and 2'-2^' wide; petioles stout, wing-margined at 

 apex f'-l' long. Flowers 1' in diameter, on short stout pedicels covered with matted pale 

 hairs, in 3-10-flowered compact compound or rarely simple villose corymbs; calyx-tube 

 broadly obconic, covered with matted pale hairs, the lobes glabrous, narrowed from the 

 base, with wide rounded sinuses between them, slender, acuminate, tipped with a small red 



\\ 



Fig. 429 



gland, and glandular-serrate with stipitate red glands; stamens 20; anthers pale yellow; 

 styles 4 or 5, usually 5. Fruit ripening at the end of September, on stout erect villose pedi- 

 cels, in few-fruited clusters, subglobose, often broader than high, crimson, lustrous, marked 

 by numerous large pale dots, pubescent at the ends, and '-f ' in diameter; calyx prominent, 

 with a short villose tube, and reflexed appressed villose lobes often deciduous from the 

 ripe fruit; flesh thick, light yellow, dry and mealy; nutlets 4 or 5, thin, full and rounded at 

 apex, narrowed and acute at base, grooved with a broad shallow groove and sometimes 

 irregularly ridged on the back, about TV long. 



A tree, 20-25 high, with a tall trunk sometimes 6' in diameter, slender branches forming 

 a narrow open head, and thin nearly straight branchlets thickly covered at first with long 

 lustrous white hairs, dull light reddish brown and puberulous at the end of their first season, 

 becoming dark gray-brown, and armed with stout straight or slightly curved dark purple 

 shining spines usually about 1|' long, or unarmed. 



Distribution. Banks of small streams in moist soil from Doe Run to Bismarck, St. 

 Frangois County, Missouri. 



78. Crataegus canadensis Sarg. 



Leaves ovate, short-pointed, slightly lobed usually only above the middle with short 

 broad acute lobes, and coarsely and frequently doubly serrate to the broad-cuneate base 

 with spreading glandular teeth, coated above in early spring with soft white hairs, and 

 below with dense hoary tomentum, about a third grown when the flowers open at the end 

 of May, and at maturity thin and firm in texture, blue-green and scabrate on the 





