Crataegus (sect. Crataegus) ser. Apiifoliae

Man. Cult. Trees ed. 2, 367. 1940.

Endemic
Basionym: Crataegus sect. Apiifoliae Loudon Arbor. Frutic. Brit. 2: 824. 1838
Treatment appears in FNA Volume 9. Treatment on page 498. Mentioned on page 492, 496.

Shrubs or trees, 20–80 dm often with crown of ± layered branches. Stems: trunk bark particolored, smooth, thin, exfoliating in irregular flakes; compound thorns on trunks absent; thorns on twigs determinate. Leaves: petiole length 80–150% blade; blade broadly ovate to deltate, lobes 3 per side at 45°–70° angle with midvein, sinuses deep, venation craspedodromous, veins to major sinuses. Inflorescences 4–10-flowered; branches densely pubescent; bracteoles caducous, linear, small, membranous, margins irregularly toothed, teeth gland-tipped. Flowers 12–17 mm diam.; sepals narrowly triangular; petals elliptic; stamens 20, anthers reddish; styles 1 or 2 (or 3). Pomes bright red, ellipsoid to sometimes orbicular, 4–6 mm diam., glossy; flesh mealy when ripe; sepal remnants persistent; pyrenes 1 or 2 (or 3), dorsally convex, sides plane.

Distribution

se United States

Discussion

Species 1.

Series Apiifoliae is widespread and common and has obvious similarities to European ser. Crataegus in the distinctive leaf shape, relatively small flowers, long filaments, and small, few-pyrened fruit; it differs from the latter series in possessing only determinate thorns.

Selected References

None.

0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
70 +  and 45 +
James B. Phipps +
Linnaeus +
exfoliating +
compound +  and simple +
opposite +  and alternate +
Crataegus sect. Apiifoliae +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
broadly ovate +  and deltate +
1.2 cm12 mm <br />0.012 m <br /> (6 cm60 mm <br />0.06 m <br />) +
adnate +  and distinct +
crowded +, scattered +  and alternate +
se United States +
not +  and aggregated +
1.2 cm12 mm <br />0.012 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
not +  and aggregated +
yellow +  and red or purplish +
0.6 cm6 mm <br />0.006 m <br /> (2 cm20 mm <br />0.02 m <br />) +
tomentose +  and glabrous +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
entire +  and serrate +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and basal +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0 (?) +  and 4 (?) +
free +  and distinct +
post-mature +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
bright red +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
orbicular +  and ellipsoid to sometimes +
Man. Cult. Trees ed. +
not arillate +
persistent +
free +  and distinct +
appressed +  and erect +
triangular +
1-50-flowered +  and few-leaved +
craspedodromous +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus (sect. Crataegus) ser. Apiifoliae +
Crataegus sect. Crataegus +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
curved +  and straight +
slender +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
gland-tipped +
inconspicuous +
exfoliating +
1 +  and few +
determinate +
2 +  and 8 +
tree +  and shrub +