Crataegus okanaganensis

J. B. Phipps & O'Kennon

Sida 18: 178, figs. 5, 9d–f. 1998.

Common names: Okanagan hawthorn
EndemicIllustrated
Treatment appears in FNA Volume 9. Treatment on page 504. Mentioned on page 505, 506, 507.

Shrubs, often multi-trunked, 30–60 dm. Stems: twigs: new growth sparsely pubescent, 1-year old mid to dark-brown; thorns on twigs recurved, deep brown, shiny young, usually stout, 2–4 (–5) cm. Leaves: petiole 1–2 cm, sparsely hairy, eglandular or glandular when young; blade glossy especially when young, expanding leaves often reddish, glabrescent, ± ovate to ovate-rhombic or ± oblong, 3.5–6 cm, ± coriaceous, base rounded to cuneate, lobes 0–4 per side (3–4 per side, well defined in ± ovate to ovate-rhombic leaves; 0–3 per side, distinct in apical 1/2 only in ± oblong leaves), lobe apex acute, margins finely, doubly serrate, veins 4 or 5 per side, ± impressed adaxially, apex acute, abaxial surface glabrous, veins hairy, adaxial densely appressed-hairy. Inflorescences 10–20-flowered; branches ± villous, gland-dotted; bracteole margins glandular (glands near base stipitate only in larger bracteoles). Flowers notably cupshaped young, 12–15 mm diam.; hypanthium villous (at base) or glabrous; sepals narrowly triangular, 4–6 mm, margins finely glandular-serrate, abaxially sparsely hairy; stamens 5 or 10, anthers ivory, rarely very pale-pink; styles 2–4. Pomes bright red young (mid late Aug), older usually burgundy to deep purple, sometimes almost black (mid Sep), ovoid and 8 mm diam., or orbicular and 10 mm diam., glabrous or hairy; sepals reflexed, sometimes erect-patent, narrow, 5–7 mm; pyrenes 2–4, sides ± eroded.

Discussion

Varieties 2 (2 in the flora).

Crataegus okanaganensis is widely distributed and common from the Okanagan valley of southern British Columbia and northern Washington to northern Idaho.

Selected References

None.

Key

1 Leaf blades ± ovate to ovate-rhombic, lobes well defined; leaves ± bronze in fall; pomes pendent, ovoid. Crataegus okanaganensis var. okanaganensis
1 Leaf blades ± oblong, lobes absent or short and only in distal 1/2; leaves crimson or pink burgundy in fall; pomes ± erect, orbicular. Crataegus okanaganensis var. wellsii
... more about "Crataegus okanaganensis"
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
pale-pink +  and ivory +
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 +
rounded +  and cuneate +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
suborbiculate +, less rhombic +  and elliptic-oblong or ovate-rhombic +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
gland-dotted +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Okanagan hawthorn +
B.C. +, Idaho +  and Wash. +
not +  and aggregated +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 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 />) +
old +  and new +
glabrous +  and villous +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
glabrescent +
less ovate +  and ovate-rhombic or more or less oblong +
expanding +
3.5 cm35 mm <br />0.035 m <br /> (6 cm60 mm <br />0.06 m <br />) +
coriaceous +
obscure +  and evident +
glandular-serrate +  and serrate +
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 />) +
adnate +, free +, connate +  and distinct +
coriaceous-leaved +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
black +, usually burgundy +  and deep purple +
10 cm100 mm <br />0.1 m <br /> (8 cm80 mm <br />0.08 m <br />) +
older +  and young +
hairy +  and glabrous +
orbicular +  and ovoid +
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 +
Endemic +  and Illustrated +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus okanaganensis +
Crataegus (sect. Douglasia) ser. Purpureofructus +
species +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
straight +
slender +  and stout +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
craspedodromous +
inconspicuous +
1 +  and few +
straight +
determinate +
5 +  and 4 +