Crataegus chrysocarpa var. piperi

(Britton) Kruschke

Publ. Bot. Milwaukee Public Mus. 3: 163. 1965.

Common names: Piper’s hawthorn
Endemic
Basionym: Crataegus piperi Britton Torreya 1: 55. 1901
Synonyms: C. columbiana var. piperi (Britton) Eggleston
Treatment appears in FNA Volume 9. Treatment on page 599. Mentioned on page 597, 598.

Shrubs, 20–35 dm. Leaves: blade rhombic to narrowly rhombic or rhombic-elliptic, base ± cuneate, sinuses: max LII 15–20%, lobe apex acute, veins 5 or 6 per side, abaxial surface persistently rough-pubescent, adaxial appressed-pubescent, glabrescent. Inflorescences: branches ± villous. Flowers: 15–20 mm diam.; hypanthium villous; stamens 10, anthers cream to ivory, sometimes pink. Pomes salmon-orange young, bright red, suborbicular, 10 mm diam., pubescent. 2n = 68.


Phenology: Flowering May–Jun; fruiting Sep–Oct.
Habitat: Streamsides and washes, sagebrush, pine forests
Elevation: 300–800 m

Distribution

V9 1024-distribution-map.jpg

B.C., Idaho, Mont., Oreg., Wash.

Discussion

Variety piperi occurs in the intermontane region from the southern Coastal Range of British Columbia and the Cascades of Washington, to the Rocky Mountains of British Columbia and Montana, where it is widespread and locally common in suitable valley habitats.

Variety piperi has been treated frequently in the Pacific Northwest literature as Crataegus columbiana Howell; when that species was divided by floristicians into var. columbiana (glabrous) and var. piperi (hairy), the former could not be found. Crataegus columbiana was based on two different species and its recent typification, which makes it a synonym of C. douglasii, reflects this anomaly.

Selected References

None.

Lower Taxa

None.
glabrescent +  and appressed-pubescent +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
pink +, cream +  and ivory +
James B. Phipps +
(Britton) Kruschke +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
cuneate +
Crataegus piperi +
5 cm50 mm <br />0.05 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
purplish +  and yellow +
rhombic +  and narrowly rhombic or rhombic-elliptic +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
elliptic +  and linear +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Piper’s hawthorn +
B.C. +, Idaho +, Mont. +, Oreg. +  and Wash. +
not +  and aggregated +
300–800 m +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 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 />) +
yellowish +  and greenish brown or gray-brown +
appressed-pubescent +
Streamsides and washes, sagebrush, pine forests +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
stipitate-glandular +
deciduous +
glandular-serrate +  and serrate +
short-stipitate-glandular +
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 +
Flowering May–Jun +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
bright red +  and salmon-orange +
10 cm100 mm <br />0.1 m <br /> (?) +
suborbicular +
Publ. Bot. Milwaukee Public Mus. +
nonaccrescent +
not arillate +
persistent +
free +  and distinct +
appressed +  and erect +
spreading +  and reflexed +
triangular +
4 cm40 mm <br />0.04 m <br /> (?) +
1-50-flowered +  and few-leaved +
concave +  and plane +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
C. columbiana var. piperi +
Crataegus chrysocarpa var. piperi +
Crataegus chrysocarpa +
variety +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
black +  and dark mahogany +
straight +
less slender +  and more or less stout +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
craspedodromous +  and gland-tipped +
inconspicuous +
less erect +  and oblique +
1 +  and several +
straight +
determinate +
6 +  and 5 +