Crataegus

Common hawthorn Crataegus monogyna, copyright Jean-Pol Grandmont.

Belongs within: Rosaceae.

Crataegus, the hawthorns, is a diverse genus of often thorny shrubs and small trees found in northern temperate regions.

Characters (from Flora of China): Shrubs, subshrubs, or small trees, deciduous, rarely evergreen, armed, rarely unarmed; buds ovoid or subglobose. Leaves simple, stipulate, venation craspedodromous, margin serrate and lobed or partite, rarely entire. Inflorescences corymbose, sometimes flowers solitary. Hypanthium campanulate. Sepals 5. Petals 5, white, rarely pinkish. Stamens 5–25; carpels 1–5, connate, but free apically. Ovary inferior or semi-inferior, with 2 ovules per locule, but one rudimentary. Fruit a pome, with persistent sepals at apex; carpels bony when mature, each locule with 1 seed; seed erect, cotyledons plano-convex.

<==Crataegus
    |--C. coccinea Linnaeus 1753 [incl. C. pedicellata Sargent 1901] PCM03
    |--C. cordata [=Mespilus cordata] PCM03
    |--C. dodgei PCM03
    |--C. holmesiana PCM03
    |--C. intricata PCM03
    |--C. laciniata R-CT01
    |--C. laevigata TG88
    |--C. magniflora PCM03
    |--C. maximowiczii [incl. C. sanguinea] LO98
    |--C. mollis PCM03
    |--C. monogyna BH02
    |--C. nigra PCM03
    |--C. oxyacantha C55
    |--C. phaenopyrum PCM03
    `--C. pringlei PCM03

*Type species of generic name indicated

REFERENCES

[BH02] Bell, J. R., A. J. Haughton, N. D. Boatman & A. Wilcox. 2002. Do incremental increases of the herbicide glyphosate have indirect consequences for spider communities? Journal of Arachnology 30 (2): 288–297.

[C55] Candolle, A. de. 1855. Géographie Botanique Raisonée: Ou exposition des faits principaux et des lois concernant la distribution géographique des plantes de l’époque actuelle vol. 2. Librairie de Victor Masson: Paris.

[LO98] Lack, H. W., & H. Ohba. 1998. Die Xylothek des Chikusai Kato. Willdenowia 28: 263–276.

[PCM03] Phipps, J. B., S. Cafferty & J. A. Macklin. 2003. Lectotypification of Crataegus coccinea L. and its conspecificity with C. pedicellata Sarg. (Rosaceae). Taxon 52: 337–338.

[R-CT01] Ragusa-di Chiara, S., & H. Tsolakis. 2001. Phytoseiid faunas of natural and agricultural ecosystems in Sicily. In: Halliday, R. B., D. E. Walter, H. C. Proctor, R. A. Norton & M. J. Colloff (eds) Acarology: Proceedings of the 10^th International Congress pp. 522–529. CSIRO Publishing: Melbourne.

[TG88] Tepfer, D., A. Goldmann, N. Pamboukdjian, M. Maille, A. Lepingle, D. Chevalier, J. Dénarié & C. Rosenberg. 1988. A plasmid of Rhizobium meliloti 41 encodes catabolism of two compounds from root exudate of Calystegium sepium. Journal of Bacteriology 170 (3): 1153–1161.