Crataegus brazoria

Sargent

Bot. Gaz. 31: 233. 1901.

Common names: Brazos hawthorn
Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 556. Mentioned on page 551, 552, 638.

Shrubs or trees, 80–100 dm. Stems: older trunk bark gray and black, scaly; twigs: new growth densely white-hairy, 1-year old shiny brown, older pale gray; thorns on twigs absent or few, ± straight, 2-years old black, slender, 4–7 cm. Leaves: petiole length 35–40% blade, densely pubescent young, becoming sparsely to densely pubescent, eglandular; blade elliptic to narrowly ovate, 4–7 cm, thin, base curved-cuneate, lobes 0, or 1 or 2 apicula per side, margins serrate, teeth 1.5–2.5 mm, veins 4–6 per side, apex acute, abaxial surface woolly-pubescent, glabrescent, adaxial scabrous young, variably glabrescent. Inflorescences 7–12-flowered; branches tomentose; bracteoles caducous, linear, subherbaceous, margins glandular, parallel veined, abaxially pubescent. Flowers 15–20 mm diam.; hypanthium tomentose; sepals narrowly triangular, 5–6 mm, margins glandular-laciniate to nearly entire, abaxially densely pubescent; stamens 20, anthers rose; styles 4 or 5. Infructescences: fruiting pedicels pubescent. Pomes usually red, sometimes bright-yellow to golden or orange, suborbicular, 8–12 mm diam., often bearing residual hairs, particularly toward base or apex; sepals often broken or absent, broadly spreading; pyrenes 4 or 5.


Phenology: Flowering Mar–Apr; fruiting Sep–Oct.
Habitat: Rich alluvial soil, brush
Elevation: 10–100 m

Discussion

Of conservation concern.

Crataegus brazoria is restricted to south-central and southeastern Texas.

Crataegus brazoria was originally described as yellow-fruited with narrow leaves that more or less lack lobes. Such forms are very rare. The species is here expanded to include more abundant, red-fruited forms that extend into central Texas and are generally similar to C. texana except in leaf shape. It is plausible, because of sympatry and fruit color, that yellow-fruited C. brazoria represents introgression between its red-fruited form and C. mollis var. viburnifolia.

Selected References

None.

Lower Taxa

None.

"pubescent" is not a number.

... more about "Crataegus brazoria"
glabrescent +  and woolly-pubescent +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
James B. Phipps +
Sargent +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
curved-cuneate +
Molles +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
elliptic +  and narrowly ovate +
4 cm40 mm <br />0.04 m <br /> (7 cm70 mm <br />0.07 m <br />) +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Brazos hawthorn +
not +  and aggregated +
10–100 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 />) +
pale gray +  and brown +
older +, old +  and new +
white-hairy +
Rich alluvial soil, brush +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
persistent +
glandular-laciniate +  and nearly entire +
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 (?) +
Pink (?) +  and White (?) +
free +  and distinct +
post-mature +
pubescent +
Flowering Mar–Apr +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
bright-yellow +  and golden or orange +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
suborbicular +
not arillate +
persistent +
free +  and distinct +
triangular +
accrescent +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1-50-flowered +  and few-leaved +
shallow +  and deep +
Conservation concern +  and Endemic +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus sect. Molles +
Crataegus brazoria +
Crataegus (sect. Coccineae) ser. Molles +
species +
7 cm70 mm <br />0.07 m <br /> (9 cm90 mm <br />0.09 m <br />) +
straight +
slender +
4 cm40 mm <br />0.04 m <br /> (7 cm70 mm <br />0.07 m <br />) +
craspedodromous +  and gland-tipped +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
inconspicuous +
less erect +  and oblique +
1 +  and several +
straight +
determinate +
4 +  and 6 +
tree +  and shrub +