540 MALACEAE 



11. Crataegus viridis L. A tree often 6-10 m. tall, with gray or reddish brown fis- 

 sured and frequently exfoliating bark. Leaf-blades ovate-lanceolate, elliptic or oblong- 

 obovate, rarely ovate, 2-7 cm. long, 2-4 cm. wide, or larger on the shoots, acute or bluntly 

 pointed at the apex, narrowed or abruptly contracted at the base, irregularly serrate and 

 often with acute or blunt shallow lobes, glabrous or with tufts of pale hairs in the axils 

 of the veins beneath : corymbs compound, many-flowered, glabrous : corolla 10-14 mm. 

 wide : stamens normally 20 : fruit globose or subglobose, 4-7 mm. in diameter, red or 

 orange-red when ripe : nutlets usually 5, the hypostyle three-fourths as long as the ventral 

 angle. 



In low grounds and moist woods, Virginia and North Carolina to Florida, Texas and Missouri. 



12. Crataegus paludosa Sarg. A small tree 4-5 m. tall, with gray or reddish 

 brown bark, or more frequently a large shrub with several stems and spiny branches. Leaf- 

 blades oval, elliptic, obovate or oblanceolate, or on the shoots ovate, 2-4 cm. long, 7-30 mm. 

 wide, mostly acute at the apex, cuneate, contracted or on the shoots rounded at the base, 

 glabrous or with tufts of pale hairs in the axils of the veins beneath, serrate, occasionally 

 cleft or incised, especially on vigorous shoots : corymbs several-many-flowered : stamens 

 about 20, the anthers purple : fruit subglobose or short-oval, 5-8 mm. in diameter, red or 

 orange-red at maturity : nutlets 3-5, the hypostyle three-fourths the length of the ventral 

 angle. 



In low grounds and on banks of streams, Volusia County, Florida. 



13. Crataegus subviridis Beadle. A tree 6-8 m. tall, with gray bark. Leaf-blades 

 ovate, obovate or oval, 2.5-6 cm. long, 1-4 cm. wide, or larger on the shoots, acute or 

 acuminate, rarely rounded at the apex, contracted or narrowed at the base, or on the shoots 

 rounded and truncate, glabrous or glabrate when fully grown, the borders serrate and in- 

 cisely lobed : corymbs compound, many-flowered, pilose-pubescent : pedicels and hypan- 

 thium sparsely pilose : sepals narrowly lanceolate, entire or minutely serrate, pubescent on 

 the inner surface, at least at flowering time : corolla 12-15 mm. wide : stamens normally 

 20 : fruit globose, 5-7 mm. in diameter : nutlets 3-5, about 5 mm. long, the hypostyle 

 three-fourths as long as the nutlet. 



In low woods and on banks of streams, Chattahoochee, Florida. 



14. Crataegus interior Beadle. A small tree about 5 m. tall, with dark gray flaky 

 bark. Leaf-blades ovate, ovate-lanceolate or oblong, 2-6 cm. long, 1-4 cm. wide, glabrous 

 or glabrate when old, acute or acuminate at the apex, rounded or abruptly contracted at 

 the base, the borders serrate and deeply incised ; petioles margined, slightly hairy on the 

 upper surface, at least when young : corymbs compound, many-flowered, glabrous : pedi- 

 cels, hypanthium and exterior surface of the sepals glabrous : corolla about 15 mm. wide : 

 stamens usually 20, the anthers yellow : fruit globose, bright red at maturity, 7-8 mm. 

 wide : nutlets 3-5, about 5 mm. long, the hypostyle occupying about two-thirds of the 

 ventral angle. 



In flat woods, near Chattanooga, Tennessee. 



15. Crataegus vulsa Beadle. A tree 4-6 m. high, with a trunk 1-2 dm. in diameter, 

 clothed with gray or brownish fissured bark. Leaf-blades ovate, oval or round-ovate, 

 1.5-7 cm. long, 1-6 cm. broad, glabrous or with a few hairs along the veins and in their 

 axils, sharply and irregularly serrate and incised, acute at the apex, either rounded or 

 abruptly narrowed at the base into margined petioles : corymbs glabrous, compound, 3-10- 

 flowered : pedicels, hypanthium and exterior surface of the nearly or quite entire sepals 

 glabrous : corolla about 15 mm. wide : stamens normally 20, the anthers pale yellow or 

 nearly white : fruit globose, 7-9 mm. in diameter, at maturity yellow-green flushed with 

 red : nutlets 3-5, about 5.5 mm. long. 



In flat woods and on banks of streams, northeastern Alabama to Floyd County, northwestern 

 Georgia. 



16. Crataegus Brazoria Sarg. A tree about 6 m. tall, with a trunk 1.5 dm. in 

 diameter and ashy gray scaly bark. Leaf -blades 4-6 cm. long, 2-3.5 cm. wide, oval or obo- 

 vate, acute or acuminate at the apex, cuneate or narrowed, or on vigorous shoots rounded at 

 the base, coarsely serrate above the middle, glabrous when fully grown ; petioles winged, 

 pubescent, at least when young : corymbs compound, many-flowered, pilose : pedicels, 

 hypanthium and the lanceolate-acuminate sepals pilose-pubescent : corolla about 16 

 mm. wide : stamens 20, the small anthers dark red : fruit subglobose or short oval, when 

 ripe 6-7 mm. in diameter, bright canary -yellow : nutlets usually 5, about 6 mm. long. 



In the valley of the Brazos River, Brazoria, Texas. 



17. Crataegus sllvicola Beadle. A tree 6-10 m. tall and sometimes with a trunk 2 

 dm. in diameter covered with a close or slightly fissured and scaly bark. Leaf-blades 

 ovate, round ovate, or on vigorous shoots deltoid, 2-7 cm. long, 2-6 cm. wide, glabrous at 



