Crataegus chrysocarpa var. subrotundifolia

(Sargent) J. B. Phipps

J. Bot. Res. Inst. Texas 3: 240. 2009.

Endemic
Basionym: Crataegus subrotundifolia Sargent Bot. Gaz. 35: 394. 1903
Synonyms: C. coccinata Sargent
Treatment appears in FNA Volume 9. Treatment on page 599. Mentioned on page 598.

Shrubs, 20–30 dm. Leaves: blade ovate to rhombic-obovate, base ± cuneate, sinuses: max LII 15–20%, lobe apex acute, veins 3–5 per side, abaxial surface glabrous, adaxial appressed-pubescent young, glabrescent or becoming short-scabrous. Inflorescences: branches thin-pilose. Flowers 15–20 mm diam.; hypanthium glabrous; stamens 10, anthers cream or ivory. Pomes red, suborbicular, 8–10 mm diam., pubescent or glabrous.


Phenology: Flowering May–Jun; fruiting Sep–Oct.
Habitat: Brush
Elevation: 0–400 m

Distribution

V9 1026-distribution-map.jpg

Alta., Ont., Que., Sask., Mass., Mich., N.Y., Vt., Wis.

Discussion

Nearly all Cypress Hills (Alberta and Saskatchewan) specimens of Crataegus chrysocarpa match the characteristics of var. subrotundifolia, but they are evidently different from the eastern form representing the type.

Variety subrotundifolia is a weakly differentiated variety originally held to be restricted to the southern section of the eastern part of the range of Crataegus chrysocarpa, where it is locally common. In plants from this area, the leaves are more coriaceous and a darker green, and the fruit is a deeper, richer red than those of sympatric var. chrysocarpa.

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 />) +
ivory +  and cream +
James B. Phipps +
(Sargent) J. B. Phipps +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
cuneate +
Crataegus subrotundifolia +
5 cm50 mm <br />0.05 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
purplish +  and yellow +
ovate +  and rhombic-obovate +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
elliptic +  and linear +
thin-pilose +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Alta. +, Ont. +, Que. +, Sask. +, Mass. +, Mich. +, N.Y. +, Vt. +  and Wis. +
not +  and aggregated +
0–400 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 +
Brush +
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 +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
glabrous +  and pubescent +
suborbicular +
J. Bot. Res. Inst. Texas +
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. coccinata +
Crataegus chrysocarpa var. subrotundifolia +
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 +
3 +  and 5 +