[The Hawthorns of Mt. Adams and Vicinity]

Suksdorf's Hawthorn

Crataegus suksdorfii

(formerly C. douglasii var. suksdorfii)

Suksdorf's hawthorn as seen along Kreps Lane in Conboy Lake National Wildlife Refuge....................May 19, 2007.

The photo at right shows a leaf of Suksdorf's hawthorn, which generally is widest in the middle of the blade. Photographed along Kreps Lane......................May 19, 2007.
Characteristics:

Suksdorf's hawthorn is a deciduous shrub or small tree from 1-12 meters high. The bark is rough and scaly with gray coloration on the older branches and the younger branches a pale grayish-brown The thorns are 8-12 mm long. The leaves alternate on the branches, and they are simple with pinnate venation. The leaves are 25-75 mm long, elliptic or oblong in shape, and with double toothed margins.

The numerous flowers are in flat-topped clusters or corymbs. The individual flowrs are about 12-15 mm wide with 5 white, orbicular petals. The sepals are short and triangular. Typically there are 20 stamens (although15 are possible). There are 5 styles. The fruit are black and smooth surfaced, and this is what gives this hawthorn its common name.

This species is similar to black hawthorn (Crataegus douglasii). Although leaf shape is commonly used, this may be unreliable. The preferred characteristic used for differentiation is the number of stamens as well as the color of the young branches.


Habitat:

Suksdorf's hawthorn is found in meadows, on dry hillsides, and in riparian areas.


Range:

Suksdorf's hawthorn may be found from southern British Columbia south along the western edge of the Cascades to southern Oregon. It may be found eastward into the Columbia River Gorge.

 

 

 

 


The photo above shows a close-up of a flower of Suksdorf's hawthorn. The ovary is inferior. Flowers of this species have 20 stamens and the stigma is 5-lobed.

The photo above shows a close-up of the inflorescence of Suksdorf's hawthorn. Photographed along Kreps Lane, Conboy Lk NWR...............May 19, 2007. Note the 20 stamens and 5-lobed stigma on each flower.

The photo above shows a close-up of the dark red fruits of Suksdorf's hawthorn. Photographed along Laurel Road, Conboy Lk NWR...............September 8, 2007.

The photo above shows a close-up of the thorn of Suksdorf's hawthorn. Photographed along Laurel Road, Conboy Lk NWR...............September 8, 2007.

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The two photos seen above show close-ups of the leaves of Suksdorf's hawthorn. Note that the leaves are widest towards the middle of the blade. Photographed along Laurel Road, Conboy Lk NWR...............September 8, 2007. Click each photo to see an enlarged version.

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The photos above show close-up details of the dark berries and leaf of Suksdorf's hawthorn as seen along Laurel Road in Conboy Lake NWR.......................August 11, 2008. Click each photo to see an enlarged view.
Paul Slichter