Crataegus enderbyensis

J. B. Phipps & O'Kennon

Sida 20: 136, fig. 8. 2002.

Common names: Enderby hawthorn
Endemic
Treatment appears in FNA Volume 9. Treatment on page 505. Mentioned on page 504, 506.

Shrubs or trees, 50–60 dm. Stems: twigs: new growth pubescence not recorded, 1-year old purple-brown, older dark gray; thorns on twigs recurved, mahogany brown, shiny young, stout, 2.5 cm. Leaves: petiole 1–2 cm, glabrous, glandularity not recorded; blade ovate-rhombic, 4–8 cm, softly coriaceous, base broadly cuneate to rounded, lobes 3 per side, short, lobe apex acute, margins serrulate, veins 4 per side, distinctly impressed adaxially, apex acute or subacute, abaxial surface glabrous, veins hairy, adaxial appressed-hairy. Inflorescences 12–25-flowered; branches villous; bracteole margins glandular. Flowers 15 mm diam.; hypanthium glabrous or pubescent; sepals narrowly triangular, 5–7 mm, margins finely glandular-serrate, abaxially glabrous; stamens 10, anthers cream; styles 3. Pomes often in large, ± pendent infructescences, cream young (mid Aug), turning salmon, then red (late Aug), purple mature (Sep), ellipsoid-urceolate, 8–10 mm diam., glabrous; sepals erect-patent to reflexed, narrow, 5–7 mm, hairy; pyrenes 3, sides plane or shallowly eroded. 2n = 68.


Phenology: Flowering May; fruiting Sep–Oct.
Habitat: Brush, natural hedgerows, on mesic sites
Elevation: 300–400 m

Discussion

Crataegus enderbyensis is known from the Armstrong-Enderby region of the upper Okanagan. The species is easily recognized in the field by its dark green, softly coriaceous, somewhat drooping, convex leaves, with deeply impressed venation, as well as its usually large drooping corymbs with very pale fruit (at first), becoming red and finally turning purple-black. In flower, it is very similar to C. okanaganensis. The indumentum difference from C. okanaganensis originally noted has been found not to hold up after further collections. The differences as now understood between the two species reside only in unique characteristics of the C. enderbyensis leaf and its early pome color.

Selected References

None.

Lower Taxa

None.
... more about "Crataegus enderbyensis"
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
James B. Phipps +
J. B. Phipps & O'Kennon +
exfoliating +  and plated +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
compound +  and simple +
opposite +  and alternate +
broadly cuneate +  and rounded +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
ovate-rhombic +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
dark gray-brown +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Enderby hawthorn +
not +  and aggregated +
300–400 m +
15 cm150 mm <br />0.15 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 />) +
dark gray +  and purple-brown +
older +  and new +
Brush, natural hedgerows, on mesic sites +
pubescent +  and glabrous +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
obscure +  and evident +
glandular-serrate +  and serrulate +
denticulate +
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 +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering May +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
coriaceous-leaved +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
red +, salmon +  and cream +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
mature +  and young +
ellipsoid-urceolate +
not arillate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
persistent +
free +  and distinct +
erect-patent +  and reflexed +
triangular +
accrescent +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1-50-flowered +  and few-leaved +
shallow +  and deep +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus enderbyensis +
Crataegus (sect. Douglasia) ser. Purpureofructus +
species +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
mahogany brown +
straight +
slender +  and stout +
2.5 cm25 mm <br />0.025 m <br /> (?) +
craspedodromous +
inconspicuous +
1 +  and few +
straight +
determinate +
tree +  and shrub +