Crataegus (sect. Macracanthae) ser. Anomalae

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

Endemic
Basionym: Crataegus sect. Anomalae Sargent ex Eggleston in B. L. Robinson and M. L. Fernald, Manual ed. 7, 477. 1908
Synonyms: Crataegus ser. Brainerdianae Eggleston ex E. J. Palmer
Treatment appears in FNA Volume 9. Treatment on page 522. Mentioned on page 493, 516, 525, 546, 574, 635, 637.

Shrubs or trees, 30–70 dm. Stems: 2-year old twigs shiny, dark or reddish-brown; thorns on twigs stout to ± slender. Leaves: petiole eglandular or glandular; blade ± ovate, coriaceous to thin, lobes 3–5 per side, lobe apex ± acute, venation craspedodromous, veins 5 or 6 (–8) per side, adaxial surface glabrous or appressed-pubescent. Inflorescences 6–12-flowered; bracteoles caducous, membranous, margins sessile-glandular. Flowers 15–20 mm diam.; sepal margins subentire or glandular-serrate; stamens 7 or 8 (–10) or 20; styles 2–4 (or 5). Pomes reddish or orange-red, usually suborbicular, sometimes ± oblong-orbicular, glabrous or hairy; pyrenes 2–4, sides ± plane to erose or pitted.

Discussion

Species 3 (3 in the flora).

Members of ser. Anomalae are locally common hawthorns found from west of Lake Michigan to the Atlantic in Massachusetts and New Hampshire. Some members of the series are plausibly of hybrid origin, and if so, a member of ser. Macracanthae is always one parent, the other perhaps being either ser. Punctatae (Crataegus florifera) or ser. Tenuifoliae (most taxa, for example, C. oreophila Lance). Crataegus ×vailiae, usually treated with ser. Macracanthae, may also key here. Other (very rare or even extinct) putative hybrids that might be referred to ser. Anomalae include: C. chadsfordiana Sargent and C. spatiosa Sargent (ser. Pruinosae × ser. Macracanthae), C. desueta Sargent (C. punctata × ser. Anomalae), C. dunbarii Sargent and C. ideae Sargent (ser. Anomalae × ser. Rotundifoliae), C. kennedyi Sargent (C. jesupii × ser. Anomalae), C. randiana Sargent and C. rubrocarnea Sargent (ser. Anomalae × C. macrosperma), C. websteri Sargent (ser. Anomalae × ser. Macracanthae), C. harryi Sargent and C. shirleyensis Sargent (ser. Anomalae × ser. Punctatae), without precise parentage suggested [putative parents as suggested by E. J. Palmer (1952) are given parenthetically]. The very local and perhaps extinct C. kingstonensis Sargent is perhaps a hybrid of ser. Anomalae × C. pruinosa.

The interserial hybrids Crataegus ×bicknellii and C. ×coleae key out in the second couplet; C. ×vailiae keys out in the fifth couplet.

Selected References

None.

Key

1 Sepal margins glandular-laciniate > 2
1 Sepal margins subentire or glandular-serrate > 3
2 Twigs: new growths and inflorescence branches glabrous; stamens 10. Crataegus ×bicknellii
2 Twigs: new growths and inflorescence branches ± densely pubescent; stamens 20. Crataegus ×vailiae
3 Stamens 7 or 8(–10). Crataegus scabrida
3 Stamens 20 > 4
4 Inflorescence branches villous; adaxial leaf surfaces pubescent (young). Crataegus florifera
4 Inflorescence branches glabrous; adaxial leaf surfaces glabrous, glabrescent, or glabrate > 5
5 Fruiting sepals ± sessile. Crataegus brainerdii
5 Fruiting sepals elevated on collar. Crataegus ×coleae
appressed-pubescent +  and glabrous +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
cream +, ivory +, white +, pink +  and red +
James B. Phipps +
Loudon +
compound +  and simple +
opposite +  and alternate +
Crataegus sect. Anomalae +
less ovate or rhombic-elliptic +  and rhombic-elliptic +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
adnate +  and distinct +
crowded +, scattered +  and alternate +
North America +
not +  and aggregated +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 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 +
craspedodromous +
entire +  and serrate +
serrate +  and crenate +
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 />) +
elliptic +  and circular +
0 (?) +  and 4 (?) +
free +  and distinct +
post-mature +
glandular +  and eglandular +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
orange-red +  and reddish +
hairy +  and glabrous +
oblong-orbicular +  and suborbicular +
Man. Cult. Trees ed. +
not arillate +
persistent +
free +  and distinct +
glandular-serrate +  and subentire +
appressed +  and erect +
triangular +
1-50-flowered +  and few-leaved +
pitted +  and erose +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus ser. +
Crataegus (sect. Macracanthae) ser. Anomalae +
Crataegus sect. Macracanthae +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
slender +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
craspedodromous +  and gland-tipped +
inconspicuous +
less erect +  and oblique +
1 +  and several +
reddish-brown +  and dark +
determinate +
stout +  and more or less slender +
6 +  and 5 +
tree +  and shrub +