Crataegus atrovirens

J. B. Phipps & O’Kennon

Sida 20: 141, fig. 10. 2002.

Endemic
Treatment appears in FNA Volume 9. Treatment on page 506. Mentioned on page 504, 507.

Shrubs, 20–50 dm. Stems multiple, suberect to erect; twigs: new growth pubescent, 1-year old glossy brown, older dark gray; bark on 2–5 cm thick branches gray-brown; thorns on twigs ± straight to very slightly curved, ± slender, 3–5 cm, 2-years old dark-brown, black at tip, older deep gray. Leaves: petiole length 15–20% blade, sparsely or densely (in adaxial sulcus mature) hairy, eglandular or sparsely small glandular mainly distally; blade dark green (in fall turning bronze-brown), matte, narrowly ovate to broadly elliptic-rhombic or broadly elliptic, 4–6 (–7) cm, subcoriaceous, base cuneate, lobes 3 or 4 per side, small, max LII ca. 10%, lobe apex acute, margins serrulate, minutely glandular at apices, veins 3–5 per side, apex acute to subacute, matte, abaxial surface glabrate, vein pubescence not recorded, adaxial scabrous hairy, glabrescent. Inflorescences 12–20-flowered; branches densely spreading-pubescent; bracteoles narrow but widened distally, margins densely glandular. Flowers 10–14 mm diam.; hypanthium pubescent; sepals narrowly triangular, 4–5 mm, margins strongly glandular-serrate, abaxial pubescence not recorded; stamens 10 (–20), anthers pink; styles 2 or 3. Pomes burgundy (late Aug), blackish purple (Sep), dull, ± ovoid, 13–15 × 10 mm, hairy; flesh soft orange; sepals suberect, wide, 4–6 mm; pyrenes 2 or 3, sides pitted.


Phenology: Flowering May; fruiting Sep–Oct.
Habitat: Natural hedgerows, brush in valleys, dry habitats
Elevation: 300–500 m

Discussion

Crataegus atrovirens is known from the northern Okanagan, where it is locally common to abundant. One of its most notable characteristics are the unusually large glands on the leaf teeth. It also has smallish flowers for its series. Of species known to date from this region, C. shuswapensis is the one most likely to be confused with C. atrovirens. The mature fruit and the growth habit of C. shuswapensis are similar, but that species has leaves more sharply lobed, glabrous inflorescences, sometimes 15–18 stamens per flower, redder fruit in the fourth week of August, much smaller, less prominent fruiting sepals, whose margins, rather than being serrato-laciniate, are minutely glandular. Crataegus atrovirens also has similarities to C. okanaganensis; it is easily differentiated in the field by the usually much longer thorns, smaller flowers with pink anthers, and much darker fruit in late August. Compared to C. orbicularis, the fruit of C. atrovirens is also conspicuously larger; it is soft and ripe in the fourth week of August when the former is hard but not ripe. The erect, multi-trunked habit is also somewhat distinctive. It is a dull hawthorn, somber in appearance, contrasting markedly with more colorful congeners such as C. okanaganensis.

Selected References

None.

Lower Taxa

None.

"wide" is not a number.

... more about "Crataegus atrovirens"
glabrescent +, hairy +  and scabrous +
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 +
cuneate +
6 cm60 mm <br />0.06 m <br /> (7 cm70 mm <br />0.07 m <br />) +
narrowly ovate +  and broadly elliptic-rhombic or broadly elliptic +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
spreading-pubescent +
adnate +  and distinct +
crowded +, scattered +  and alternate +
not +  and aggregated +
300–500 m +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 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 brown +
older +, old +  and new +
Natural hedgerows, brush in valleys, dry habitats +
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 +, small +  and eglandular +
hairy +  and glabrous +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering May +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
coriaceous-leaved +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
blackish purple +  and burgundy +
1.3 cm13 mm <br />0.013 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
10 cm100 mm <br />0.1 m <br /> (?) +
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 +
triangular +
accrescent +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1-50-flowered +  and few-leaved +
shallow +  and deep +
free +  and distinct +
branched +  and simple +
suberect +  and erect +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus atrovirens +
Crataegus (sect. Douglasia) ser. Purpureofructus +
species +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
gray +, black +  and dark-brown +
less straight +  and very slightly curved +
older +  and old +
slender +  and stout +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
craspedodromous +
inconspicuous +
1 +  and few +
straight +
determinate +
not +  and hairy +
3 +  and 5 +