Flora of North America species comparison

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Crataegus monogyna

Crataegus monogyna var. monogyna

aubépine monogyne, common hawthorn, English hawthorn, hawthorn, one-seed hawthorn, singleseed hawthorn
Photo is of parent taxon

common hawthorn, English hawthorn, one-seed hawthorn
Habit Shrubs or trees, 40–100[–120] dm.
Stems

twigs: new growth glabrous;

stipules of flowering shoots ± entire;

thorns on twigs few to numerous, usually indeterminate and terminal, 0.7–1 cm, when determinate and lateral ± stout, to 2.4 cm.
Leaves

petiole slender, 1–3 cm, glabrous, eglandular;

blade ovate to deltate, 1.2–5.5 cm, base cuneate to truncate, lobes 1–3 per side, sinuses usually deep, lobe apex acute, margins weakly and often few-toothed at lobe apices, veins 2–5 per side, apex acute, abaxial surface paler green, villous on major veins, adaxial ± lustrous dark green, glabrous or mainly villous.
Inflorescences

5–15-flowered, ± lax;

branches glabrous [to villous];

bracteole margins entire or bearing few to numerous glands on small irregular protuberances or on small pegs.
Flowers

8–16 mm diam.;

hypanthium glabrous [to lanate];

sepals 1.5–2.5 mm, margins entire, apex acute or obtuse;

stamens 15–20, anthers pink-purple;

style 1.
Pomes

sometimes bright, usually dark red, orbicular to ± cylindric, 6–11 mm diam.;

sepals reflexed;

pyrene 1.
2n

= 34, 51.

Crataegus monogyna

Crataegus monogyna var. monogyna
Phenology Flowering Apr–May; fruiting Sep–Oct.
Habitat Brush, woodland edges and old pastures in medium rainfall areas
Elevation 10–800 m (0–2600 ft)
Distribution
from FNA
CA; CO; CT; DE; IL; IN; MA; ME; MI; MN; NH; NJ; NY; OH; OR; PA; RI; VT; WA; WI; BC; NB; NS; ON; PE; QC; Europe; w Asia; n Africa [Introduced also in South America, s Africa, Pacific Islands, Australia]
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; CO; CT; DE; IL; IN; MA; ME; MI; MN; NH; NJ; NY; OH; OR; PA; RI; VT; WA; WI; BC; NB; NS; ON; PE; QC; Europe; sw Asia; n Africa [Introduced in North America; introduced also in South America (Argentina, Chile), s Africa, Pacific Islands (New Zealand), Australia]
Discussion

Varieties 2 (1 in the flora).

Crataegus monogyna was introduced early to North America to be used for agricultural hedges, a practice now discontinued on this continent.

Cultivar 'Crimson Cloud,' often under an incorrect species name, is widely cultivated as an ornamental.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Variety monogyna differs from var. lasiocarpa (Lange) K. I. Christensen in the absence of villous abaxial leaf surfaces and inflorescences. Variety monogyna is distributed throughout the area of the species; var. lasiocarpa primarily occurs in the Balkan, Iranian, and Mediterranean areas, and is most common in Greece.

Variety monogyna is locally common in the Pacific Northwest and adjacent Canada, as well as from the Great Lakes to the Atlantic. The variety hybridizes in North America with the diploid species Crataegus suksdorfii and rarely with C. punctata. The hybrid with C. laevigata, C. ×media Bechstein, is well known in the wild in Europe; only its cultivars are seen in North America.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 497. FNA vol. 9, p. 497.
Parent taxa Rosaceae > subfam. Amygdaloideae > tribe Maleae > Crataegus > sect. Crataegus > ser. Crataegus Rosaceae > subfam. Amygdaloideae > tribe Maleae > Crataegus > sect. Crataegus > ser. Crataegus > Crataegus monogyna
Sibling taxa
C. aemula, C. aestivalis, C. alabamensis, C. alleghaniensis, C. annosa, C. aprica, C. aquacervensis, C. ashei, C. atrovirens, C. attrita, C. austromontana, C. beata, C. berberifolia, C. biltmoreana, C. brachyacantha, C. brainerdii, C. brazoria, C. brittonii, C. buckleyi, C. calpodendron, C. castlegarensis, C. chrysocarpa, C. coccinea, C. coccinioides, C. cognata, C. collina, C. colonica, C. communis, C. compacta, C. condigna, C. craytonii, C. crocea, C. crus-galli, C. cupressocollina, C. delawarensis, C. dispar, C. dodgei, C. douglasii, C. egens, C. egregia, C. enderbyensis, C. erythropoda, C. exilis, C. eximia, C. extraria, C. fecunda, C. flabellata, C. flava, C. florens, C. floridana, C. florifera, C. fluviatilis, C. formosa, C. frugiferens, C. furtiva, C. gattingeri, C. gaylussacia, C. gilva, C. greggiana, C. harbisonii, C. holmesiana, C. ignava, C. incilis, C. integra, C. intricata, C. invicta, C. iracunda, C. irrasa, C. jesupii, C. jonesiae, C. lacrimata, C. laevigata, C. lanata, C. lancei, C. lanuginosa, C. lassa, C. laurentiana, C. leonensis, C. lepida, C. levis, C. lumaria, C. macracantha, C. macrosperma, C. magniflora, C. margarettae, C. marshallii, C. mendosa, C. meridiana, C. mira, C. mollis, C. munda, C. nananixonii, C. neobushii, C. nitida, C. oakesiana, C. okanaganensis, C. okennonii, C. opaca, C. opima, C. orbicularis, C. ouachitensis, C. padifolia, C. pennsylvanica, C. persimilis, C. pexa, C. phaenopyrum, C. phippsii, C. pinetorum, C. populnea, C. prona, C. pruinosa, C. pulcherrima, C. punctata, C. purpurella, C. quaesita, C. reverchonii, C. rivularis, C. rivuloadamensis, C. rivulopugnensis, C. roribacca, C. rubella, C. rubribracteolata, C. saligna, C. sargentii, C. scabrida, C. schizophylla, C. schuettei, C. segnis, C. senta, C. sheila-phippsiae, C. sheridana, C. shuswapensis, C. sororia, C. spathulata, C. spes-aestatum, C. stolonifera, C. stonei, C. submollis, C. suborbiculata, C. succulenta, C. tecta, C. teres, C. texana, C. tracyi, C. triflora, C. turnerorum, C. uniflora, C. ursopedensis, C. venusta, C. viridis, C. visenda, C. wattiana, C. williamsii, C. wootoniana, C. ×atrorubens, C. ×bicknellii, C. ×coleae, C. ×collicola, C. ×disperma, C. ×dispessa, C. ×fretalis, C. ×incaedua, C. ×kelloggii, C. ×latebrosa, C. ×lucorum, C. ×rufula, C. ×sicca, C. ×vailiae
Subordinate taxa
C. monogyna var. monogyna
Name authority Jacquin: Fl. Austriac. 3: 50, plate 292, fig. 1. (1775) unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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