Crataegus ursopedensis

J. B. Phipps & O’Kennon

J. Bot. Res. Inst. Texas 1: 1081, plates 6.1d, 7.4d, fig. 27. 2007.

Common names: Bear's Paw hawthorn
Endemic
Treatment appears in FNA Volume 9. Treatment on page 596. Mentioned on page 495, 521, 525, 593, 594, 595.

Shrubs, 20–30 (–40) dm. Stems: expanding bud-scales orange-tan or paler; twigs: new growth pubescent, 1-year old shiny redbrown, 2-years old redbrown with white flakes, older gray; thorns on twigs usually numerous, ± straight to recurved, 2-years old shiny, very dark redbrown, ± stout, (3–) 4–7 cm. Leaves: petiole length 30–45% blade, glabrous (adaxial sulcus hairy mature), densely sessile-glandular; blade ovate to ovate-trullate, 5.5–9.5 cm (flabellate, 2–3 cm at early anthesis), subcoriaceous, base cuneate to narrowly cuneate, lobes 4 or 5 per side, sinuses deep (max LII 25–35%), lobe apex acute to acuminate, margins ± serrate, teeth numerous, small, veins 5 per side, apex acuminate, glossy, abaxial surface glabrous, main veins sometimes sparsely to moderately pubescent young, adaxial densely scabrous young, glabrate mature. Inflorescences (1–) 5–12-flowered, widely spread at full anthesis; branches moderately pubescent; bracteoles cream to pale green, often suffused light red especially distally, narrowly elliptic, membranous, margins densely sessile-glandular, appearing to grade into bud-scales. Flowers 15–18 mm diam.; hypanthium exterior pubescent, interior glabrous; sepals pale green to scarious, triangular, 4–5 mm, margins glandular or glandular-denticulate, abaxially glabrous, adaxially sparsely hairy; stamens 10, anthers ivory; styles 3 or 4. Pomes 1–8 mm; branches pubescent, sometimes sparsely; orange-red young, becoming orange-red to bright red, ellipsoid or oblong, 8–11 mm tall, pubescent; sepals spreading to ± appressed, 3–4 mm; pyrenes 3 or 4, sides plane to shallowly concave.


Phenology: Flowering May–Jun; fruiting not recorded.
Habitat: Thickets, shade of aspen or poplar
Elevation: 800–1300 m

Discussion

Crataegus ursopedensis is restricted to and locally common in the Bear's Paw Mountains (Montana) and the Cypress Hills (Alberta and Saskatchewan).

Crataegus ursopedensis can have strikingly large, deeply incised and sharply lobed, short-shoot leaves; they are often smaller and may then be difficult to differentiate from those of C. rubribracteolata. Compared to the latter, the thorns are often longer, the inflorescences more open, the petioles proportionately longer, the bracteoles paler and, significantly, the pyrene sides more nearly plane. Crataegus ursopedensis is strikingly distinct within ser. Rotundifoliae and perhaps does not belong there.

Selected References

None.

Lower Taxa

None.
... more about "Crataegus ursopedensis"
mature +  and young +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
glabrous +  and pubescent +
James B. Phipps +
J. B. Phipps & O’Kennon +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
cuneate +  and narrowly cuneate +
Crataegus sect. Rotundifoliae +
6 cm60 mm <br />0.06 m <br /> (9.5 cm95 mm <br />0.095 m <br />) +
blue-green +  and dark green +
ovate +  and ovate-trullate +
5.5 cm55 mm <br />0.055 m <br /> (9.5 cm95 mm <br />0.095 m <br />) +
elliptic +  and linear +
red +, suffused light +, cream +  and pale green +
orange-red +  and bright red +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
oblong +  and ellipsoid +
paler +  and orange-tan +
expanding +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Bear's Paw hawthorn +
Alta. +, Sask. +  and Mont. +
not +  and aggregated +
800–1300 m +
1.5 cm15 mm <br />0.015 m <br /> (1.8 cm18 mm <br />0.018 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 />) +
gray +  and redbrown +
older +, old +  and new +
Thickets, shade of aspen or poplar +
glabrous +  and pubescent +
glabrous +  and pubescent +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
(1-)5-12-flowered +
crassinucellate +
stipitate-glandular +
deciduous +
glandular +  and sessile-glandular +
hairy +  and glabrous +
glandular-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 +
pubescent +  and glabrous +
Flowering May–Jun +  and fruiting not recorded. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
burgundy +, orangish +, yellowish +, red +  and deep +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
pubescent +  and glabrous +
oblong +, ellipsoid +  and suborbicular +
0.1 cm1 mm <br />0.001 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
J. Bot. Res. Inst. Texas +
nonaccrescent +
not arillate +
persistent +
free +  and distinct +
spreading +  and more or less appressed +
triangular +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1-50-flowered +  and few-leaved +
plane +  and shallowly concave +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus ursopedensis +
Crataegus (sect. Coccineae) ser. Rotundifoliae +
species +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
dark redbrown +
straight +
less stout +  and more or less slender +
4 cm40 mm <br />0.04 m <br /> (7 cm70 mm <br />0.07 m <br />) +
craspedodromous +  and gland-tipped +
inconspicuous +
less erect +  and oblique +
1 +  and several +
straight +
determinate +