S8 MISSOURI BOTANICAL GARDEN 



^ 



7. Crataegus ludoviciensis Sargent, Trees and Shrubs, 



ii. 5, t. 103 (1907). 



Dcs Peres River bottoms, Carondelet, St. Louis County, 

 J. H. Kellogg, (No. 7) 1902-1905. 



8. Crataegus mitis Sargent 



Cahokia, below East St 



Illinois, J. H. Kellogg. 



T 



9. Crataegus atrorubens Ashe, Jour. Elisha Mitchell Sci. 



Soc. xvi. pt. ii. 78 (1900).— Sargent, Silva N. Am. xiii. 

 181, t. 704; Manual, 408, f. 327. 



Mississippi River bottoms, East St. Louis, Illinois. 



10. Crataegus Dawsoniana, n. sp. 



Leaves ovate to ovvil, acuminate, gradually or abruptly narrowed and 

 concave-cuneatc at the entire base, sharply often doubly serrate above, 

 with straight glandular teeth, and occasionally slightly 3-lobed at the 

 apex; about half-grown when the flowers oixin late in May or early in June 

 and then very thin, yellow-gn^en, sparingly hairy on the midribs above 

 and villose on the midribs and primary veins and in their axils below, 

 and at maturity thin, dark yellow-green and glabrous above, paler and 

 still slightly hairy below on the stout rose-colored midribs and slender 

 primary veins, 4-6 cm. long and 3-4 cm. wide; petioles slender, slightly 

 wing-margined at the apex, villose during the season, 1-1.5 cm. in length; 

 stipules lincar-obovate, falcate, minutely glandular-dentate, green, de- 

 ciduous; leaves on vigorous shoots ovate, rounded or abruptly cuneate at 

 the broad base, more coarsely serrate, laterally lobed, with broad acute 

 lobes, often 7-8 cm. long and G-7 cm. wide, with foliaceous lunate coarsely 

 glandular-serrate persistent stipules. Flowers 1.4-1,5 cm. in diahieter^ 

 on long slender slightly hairy pedicels, in wide mostly 10-15-flowered 

 corymbs, the elongated lower peduncles from the axils of upper leaves; 

 calyx- tube narrowly obconic, covered with matted pale hairs, the lobes 

 gradually narrowed from the base, acute, finely glandular-serrate, glabrous 

 on the outer, villose on the inner surface, rcflexed after anthesis; stamens 

 20; anthers pale yellow; styles 4 or 5, Fruit ripening in October and 

 remaining on the branches during the winter, on long slender nearly 

 glabrous red pedicels, in many-fruited drooping clusters, obovate, full and 

 rounded at the apex, gradually narrowed at the base, orange-red, lustrous, 

 marked by occasional dark dots, 1-1.2 cm. long and 8-10 nun. hi diameter; 

 calj^ httle enlarged, with a wide shallow cavity, and small spreading lobes 

 dark red on the upper side below the middle; flesli thick, yellow, dry and 

 mealy; nutlets 4 or 5, acute at the base, narrowed and rounded at the 

 apex, rounded and only slightly grooved on the back, 4.5-5 mm. long, and 

 3-3.5 mm, wide. 



