Crataegus shuswapensis

J. B. Phipps & O’Kennon

Sida 20: 128, fig. 5. 2002.

Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 514. Mentioned on page 506, 507, 511.

Shrubs, 55 dm. Stems: 1-year old twigs tan to deep brown; thorns on twigs straight or slightly recurved, very dark-brown young, 2–3 cm. Leaves: petiole 1.5–2.2 cm, pubescent, sparsely gland-dotted; blade rhombic, 5–7 cm, lobes 4 per side, sinuses deep, lobe apex acute, margins remotely serrate, venation craspedodromous, veins 4 or 5 per side, apex acute, abaxial surface glabrous, adaxial sparsely appressed-pubescent. Inflorescences 12–18-flowered; branches glabrous; bracteole margins glandular. Flowers 15 mm diam.; hypanthium glabrous; sepals triangular, 4–5 mm, margins minutely glandular; stamens 10–18, anthers pale to bright pink or puce; styles 3 or 4. Pomes brick-red young, deep purple mature, somewhat glaucous, suborbicular to ± broadly ellipsoid, 12 mm diam., glabrous; sepals remnants patent-recurved, apex acute; pyrenes (3 or) 4, sides plane to ± concave, grooved, or irregularly scarred. 2n = 68.


Phenology: Flowering May; fruiting Sep–Oct.
Habitat: Thickets, natural hedgerows, shade of riverine Populus
Elevation: 300–500 m

Discussion

Of conservation concern.

Crataegus shuswapensis is locally common near Enderby in the northern Okanagan and southwestern Shuswap drainage. Flowering plants from Lake County, Montana, are indistinguishable; fruiting plants from these populations have not been collected.

Crataegus shuswapensis is a distinctive member of ser. Douglasianae in the Okanagan because of its relatively long, stout thorns, large, wide, rhombic, and deeply and sharply incised leaf blades, pink, sometimes puce anthers, somewhat low style and pyrene numbers, and fairly large for the series, suborbicular to broadly ellipsoid purple fruit. Also, this species has a greater frequency of plane-sided pyrenes than has been noted in C. douglasii.

Crataegus shuswapensis is unusual in the genus for its unstable stamen number; in its other characteristics, it is more uniform. The majority of specimens that have been assigned to this species have about ten stamens; these are not dissimilar to an extreme form of C. douglasii that is locally common in northwest Montana and has been noted occasionally elsewhere. This latter variant of C. shuswapensis may be a single apomictic race.

Selected References

None.

Lower Taxa

None.
... more about "Crataegus shuswapensis"
appressed-pubescent +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
puce +, pale +  and bright pink +
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 +
elliptic to more or less obovate rhombic oblanceolate or ovate +  and elliptic +
5 cm50 mm <br />0.05 m <br /> (8 cm80 mm <br />0.08 m <br />) +
rhombic +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
? (?) +  and ? (?) +
orange +  and dark gray-brown +
adnate +  and distinct +
crowded +, scattered +  and alternate +
not +  and aggregated +
300–500 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 />) +
usually tan +  and deep mahogany +
pubescent +  and glabrous +
Thickets, natural hedgerows, shade of riverine Populus +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
obscure +  and evident +
craspedodromous +
subentire +
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 +
1.5 cm15 mm <br />0.015 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
gland-dotted +
1.5 cm15 mm <br />0.015 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
Flowering May +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
12 cm120 mm <br />0.12 m <br /> (?) +
mature +  and young +
glabrous +  and glaucous +
suborbicular +  and more or less broadly ellipsoid +
not arillate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
persistent +
free +  and distinct +
patent-recurved +  and reflexed +
triangular +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1-50-flowered +  and few-leaved +
scarred +
plane +  and more or less concave +
Conservation concern +  and Endemic +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus shuswapensis +
Crataegus (sect. Douglasia) ser. Douglasianae +
species +
craspedodromous +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
straight +
slender +  and stout +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
craspedodromous +  and gland-tipped +
inconspicuous +
1 +  and few +
tan +  and deep brown +
straight +
determinate +
5 +  and 4 +