ROSACE^E 409 



pedicels, in broad loose many-flowered glabrous corymbs; calyx-tube narrowly obconic, 

 the lobes narrow, elongated, acuminate, entire or occasionally obscurely and irregularly 

 serrate; stamens usually 10, occasionally 11-13; anthers small, pale yellow; styles 3 or 4, 

 surrounded at base by a narrow ring of short pale hairs. Fruit on elongated pedicels, in 

 few-fruited drooping clusters, subglobose and usually a little longer than broad, flattened 

 at the ends, dark dull crimson marked by occasional dark-colored dots, \'-\' long; calyx- 

 tube short, the lobes closely appressed, gradually narrowed from a broad base and usually 

 persistent on the ripe fruit; nutlets 3 or 4, with a broad high grooved ridge, T y long. 



Fig. 361 



A tree, 25-40 high, with a trunk l-3 in diameter, thick ascending branches forming 

 a wide open rather symmetrical head, and bright chestnut-brown or orange-brown ulti- 

 mately dark brown spreading branchlets armed with thin straight chestnut-brown spines 

 l'-2' long. 



Distribution. Rich bottom-lands of the Mississippi River, St. Claire County, Illinois 

 (east St. Louis, near Fish Lake, and Kahokia) ; banks of Desperes River, south St. Louis, 

 St. Louis County, and Osage, Cole County, Missouri. 



10. Crateegus acutifolia Sarg. 



Leaves oval to oblong-obovate, acute or acuminate or rarely rounded at apex, cuneate 

 at the usually entire base, finely crenulate-serrate often only above the middle with glan- 

 dular teeth, nearly fully grown when the flowers open about the 10th of May, and then 

 membranaceous, and lustrous above, with occasional short scattered pale caducous hairs 

 on the upper side of the midrib, and at maturity thin and firm, dark green and lustrous 

 above, pale yellow-green below, about If long, and 1' wide, with a slender light yellow 

 midrib and about 4 or 5 pairs of thin primary veins: petioles glandular when they first 

 appear with minute dark glands, %'-%' in length; leaves at the end of vigorous shoots 

 frequently divided at apex into 2 or 3 pairs of short acute lobes, and often 3' long and 

 2' wide. Flowers \' in diameter, on slender pedicels, in many-flowered compact 

 corymbs; calyx-tube narrowly obconic, the lobes lanceolate, acuminate, entire or ob- 

 scurely and irregularly glandular-serrate; stamens 10; anthers small, pale yellow; styles 

 2 or 3. Fruit ripening and falling at the end of September, on slender pedicels f-f 

 long, in few-fruited drooping clusters, short-oblong, full and rounded at the ends, bright 

 scarlet, marked by occasional dark dots, \' long; calyx-tube prominent, with closely ap- 

 pressed lobes often deciduous before the fruit ripens; nutlets 2 or 3, with a broad rounded 

 ridge, about iV long. 



