ROSACEA 



403 



subglobose or a little longer than broad, orange-red, \'--^^ long; calyx enlarged, with 

 elono-ated closely appressed lobes sometimes deciduous from the ripe fruit; flesh thin, 

 dry and mealy; nutlets 5, acute at the ends, rounded or slightly ridged on the back, 

 about y\' long. 



A tree, 25-30 high, with a tall trunk sometimes a foot in diameter, covered with 

 smooth gray bark, slender glabrous branchlets light reddish brown and lustrous dur- 

 ing their first year, becoming grayish brown in their second season, and unarmed or 

 armed with occasional dark purple slender slightly curved shining spines 1' long. 



Distribution. Low moist soil on the banks of the River Desperes, St. Louis, 

 Missouri (John D. Kellogg, October 1901, May 1902). 



37. Crataegus vulsa, Beadl. 



Leaves oval or ovate, acute, full and rounded or broadly cuneate at the entire 

 base, irregularly and often doubly serrate above, with straight or incurved gland- 

 tipped teeth, and often divided into several short acute lateral lobes, when they unfold 

 dark bronze-red and pilose, with scattered caducous hairs, and with tufts of pale 



h^.(322 



often persistent hairs in the axils of the principal veins, nearly fully grown when the 

 flowers open late in April, and at maturity thin, bright green on the upper surface, 

 paler ou the lower surface, about 2' long and 1^' wide, with slender midribs and 

 4 or 5 pairs of thin pale yellow primary veins, turning in the autumn yellow or brown; 

 their petioles slender, somewhat villose at first, soon becoming glabrous, about ^' 

 long; on vigorous shoots broadly ovate, acute or acuminate, full and rounded or 

 occasionally truncate and broadly cuneate at the base, more coarsely dentate and 

 more deeply lobed, often 3' long and 2-^' wide, with stout winged glandular petioles 

 and narrow falcate acuminate glandular stipules. Flo"wers |' in diameter, on slen- 

 der pedicels, in compact compound 3-10-flowered glabrous corymbs, with linear acu- 

 minate glandular red bracts and bractlets; calyx-tube broadly obconic, glabrous, the 

 lobes gradually narrowed from broad bases, acuminate, entire or occasionally ob- 

 scurely serrate toward the apex, glabrous; stamens 20; anthers pale yellow; styles 

 3-5, surrounded at the base by a thin ring of pale hairs. Fruit ripening at the end 

 of September or early in October, on slender pedicels, in few-fruited drooping clus- 

 ters, globose, yellow-green flushed with red, y in diameter, the calyx prominent, with 



