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 - Crataegus cyclophylla
 
Crataegus cyclophylla — round-leaved hawthorn
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Facts
Round-leaved hawthorn has notably circular leaf outlines, hence its common name. Its species name has been a bit more contentious, with it having been treated as a variety of several other Crataegus species, including C. brainerdii and C. scabrida. In New England, this taxon is recorded only from Addison County in Vermont. Once its true identity as a species is sorted out (likely through genetic fingerprinting), perhaps more populations will be found.
Habitat
Anthropogenic (human-disturbed or -maintained habitats), forest edges
New England distribution
Adapted from BONAP data
Native: indigenous.
Non-native: introduced (intentionally or unintentionally); has become naturalized.
County documented: documented to exist in the county by evidence (herbarium specimen, photograph). Also covers those considered historical (not seen in 20 years).
State documented: documented to exist in the state, but not documented to a county within the state. Also covers those considered historical (not seen in 20 years).
Note: when native and non-native populations both exist in a county, only native status is shown on the map.
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Characteristics
- Habitat
 - terrestrial
 
- New England state
 - Vermont
 
- Growth form
 - 
                                
                                    
- the plant is a shrub (i.e., a woody plant with several stems growing from the base)
 - the plant is a tree
 
 
- Leaf type
 - the leaf blade is simple (i.e., lobed or unlobed but not separated into leaflets)
 
- Leaves per node
 - there is one leaf per node along the stem
 
- Leaf blade edges
 - 
                                
                                    
- the edge of the leaf blade has lobes, or it has both teeth and lobes
 - the edge of the leaf blade has teeth
 
 
- Leaf duration
 - the leaves drop off in winter (or they wither but persist on the plant)
 
- armature on plant
 - the plant has spines, prickles, or thorns
 
- Leaf blade length
 - 35–70 mm
 
- Leaf stalk
 - the leaves have leaf stalks
 
- Fruit type (general)
 - the fruit is fleshy
 
- Twig winter color
 - 
                                
                                    
- brown
 - red
 
 
- Bud scale number
 - there are three or more scales on the winter bud, and they overlap like shingles, with one edge covered and the other edge exposed
 
- 
                        
Buds or leaf scars
- Bud scale number
 - there are three or more scales on the winter bud, and they overlap like shingles, with one edge covered and the other edge exposed
 
- Bud scar shape (Fraxinus)
 - NA
 
- Collateral buds
 - there are no collateral buds on the sides of the branches
 
- Superposed buds
 - there are no superposed buds on the branch
 
 - 
                        
Flowers
- Anther color
 - there is a noticeable pink, reddish or purplish tint to the anthers
 
- Carpels fused
 - the carpels are fused to one another
 
- Enlarged sterile flowers
 - there are no enlarged sterile flowers on the plant
 
- Flower petal color
 - white
 
- Flower symmetry
 - there are two or more ways to evenly divide the flower (the flower is radially symmetrical)
 
- Hairs on ovary (Amelanchier)
 - NA
 
- Hypanthium present
 - the flower has a hypanthium
 
- Inflorescence hairs
 - there are no hairs on the inflorescence
 
- Inflorescence type
 - the inflorescence is a corymb (with long lower branches and shorter upper branches, giving it a more or less flat-topped look)
 
- Number of pistils
 - 1
 
- Ovary position
 - 
                                
                                    
- the ovary is above the point of petal and/or sepal attachment
 - the ovary is below the point of petal and/or sepal attachment
 
 
- Petal and sepal arrangement
 - the flower includes two cycles of petal- or sepal-like structures
 
- Petal appearance
 - the petals are thin and delicate, and pigmented (colored other than green or brown)
 
- Petal fusion
 - the perianth parts are separate
 
- Sepal cilia (Ilex)
 - NA
 
- Sepal tip glands
 - there are no glands at the tips of the sepal lobes
 
- Stamen number
 - 13 or more
 
- Stamens fused
 - the stamens are not fused to one another
 
 - 
                        
Fruits or seeds
- Berry color
 - red
 
- Fruit tissue origin
 - the hypanthium of the flower becomes part of the fruit
 
- Fruit type (general)
 - the fruit is fleshy
 
- Fruit type (specific)
 - the fruit is a berry (fleshy, with the wall enclosing one or more sections, with two or more seeds)
 
- Nut with spines (Fagaceae)
 - NA
 
- Wings on fruit
 - there are no wings on the fruit
 
 - 
                        
Glands or sap
- Sap color
 - the sap is clear and watery
 
- Stalked glands on fruit (Rosa)
 - NA
 
 - 
                        
Growth form
- Growth form
 - 
                                
                                    
- the plant is a shrub (i.e., a woody plant with several stems growing from the base)
 - the plant is a tree
 
 
 - 
                        
Leaves
- Hairs on upper side of leaf blade
 - 
                                
                                    
- the upper side of the leaf is fuzzy or hairy
 - the upper side of the leaf is not hairy, or has very few hairs
 
 
- Leaf blade base shape
 - 
                                
                                    
- the base of the leaf blade is cuneate (wedge-shaped, tapers to the base with relatively straight, converging edges), or narrow
 - the base of the leaf blade is rounded
 
 
- Leaf blade edges
 - 
                                
                                    
- the edge of the leaf blade has lobes, or it has both teeth and lobes
 - the edge of the leaf blade has teeth
 
 
- Leaf blade edges (Acer)
 - NA
 
- Leaf blade flatness
 - the leaf is flat (planar) at the edges
 
- Leaf blade hairs
 - the hairs on the leaf blade are different from the choices given
 
- Leaf blade length
 - 35–70 mm
 
- Leaf blade scales
 - there are no scales on the leaf blades
 
- Leaf blade shape
 - 
                                
                                    
- the leaf blade is elliptic (widest near the middle and tapering at both ends)
 - the leaf blade is orbicular (roughly circular, as wide as long)
 - the leaf blade is ovate (widest below the middle and broadly tapering at both ends)
 
 
- Leaf blade texture
 - 
                                
                                    
- the leaf blade is coriaceous (has a firm, leathery texture)
 - the leaf blade is herbaceous (has a leafy texture)
 
 
- Leaf blade translucent dots
 - there are no translucent dots on the leaf blade
 
- Leaf duration
 - the leaves drop off in winter (or they wither but persist on the plant)
 
- Leaf form
 - the plant is broad-leaved (with broadly flattened leaf blades)
 
- Leaf lobe tips (Quercus)
 - NA
 
- Leaf midrib glands
 - the midrib of the leaf blade lacks glands on the upper surface
 
- Leaf stalk
 - the leaves have leaf stalks
 
- Leaf stalk nectaries
 - 
                                
                                    
- the leaf stalk has nectaries on it
 - there are no nectaries on the leaf stalk
 
 
- Leaf teeth
 - the leaf blade margin is serrate (with forward-pointing) or dentate (with outward-pointing) with medium-sized to coarse teeth
 
- Leaf teeth hairs (Carya)
 - NA
 
- Leaf type
 - the leaf blade is simple (i.e., lobed or unlobed but not separated into leaflets)
 
- Leaves per node
 - there is one leaf per node along the stem
 
- Specific leaf type
 - the leaves are simple (i.e., lobed or unlobed but not separated into leaflets
 
- Stipules
 - the plant has stipules
 
 - 
                        
Place
- Habitat
 - terrestrial
 
- New England state
 - Vermont
 
- Specific habitat
 - 
                                
                                    
- edges of forests
 - human-disturbed or -maintained habitats
 
 
 - 
                        
Scent
- Plant odor
 - the plant does not have much of an odor, or it has an unpleasant or repellant odor
 
 - 
                        
Stem, shoot, branch
- Aerial roots
 - the plant has no aerial roots
 
- Branch brittleness (willows only)
 - NA
 
- Branch cross-section
 - the branch is circular in cross-section, or it has five or more sides, so that there are no sharp angles
 
- First-year cane (Rubus)
 - NA
 
- Pith shape
 - the outline of the pith in a twig is roughly round
 
- Twig papillae (Vaccinium species only)
 - NA
 
- Twig winter color
 - 
                                
                                    
- brown
 - red
 
 
- Wings on branch
 - the branch does not have wings on it
 
- armature on plant
 - the plant has spines, prickles, or thorns
 
 
Wetland status
Not classified
In New England
Distribution
- Connecticut
 - absent
 
- Maine
 - absent
 
- Massachusetts
 - absent
 
- New Hampshire
 - absent
 
- Rhode Island
 - absent
 
- Vermont
 - present
 
Conservation status
None
Native to North America?
Yes
Sometimes confused with
- Crataegus asperifolia:
 - leaf blades on short shoots ovate to elliptic-ovate, acute to short-acuminate at the apex, and pomes subglobose to short-obloid (vs. C. cyclophylla, with leaf blades on short shoots ovate to oblong-obovate or obovate, obtuse to subacute at the apex, and pomes globose to subglobose).
 - Crataegus bicknellii:
 - calyx lobes prominently glandular-lobed, flowers with 4 or 5 styles, and pome with the persistent sepals elevated on a collar (vs. C. cyclophylla, with calyx lobes weakly to prominently glandular-serrate, flowers with 2-4 styles, and pome with the persistent sepals sessile or nearly so).
 
Synonyms
- Crataegus brainerdii Sarg. var. cyclophylla (Sarg.) Palmer
 - Crataegus cyclophylla Sarg.
 - Crataegus scabrida Sarg. var. cyclophylla (Sarg.) Kruschke