Crataegus greggiana

Eggleston

Bull. Torrey Bot. Club 36: 511. 1909.

Common names: Gregg hawthorn
Conservation concern
Synonyms: Crataegus uvaldensis Sargent
Treatment appears in FNA Volume 9. Treatment on page 550. Mentioned on page 642.

Shrubs or trees, 40–80 dm. Stems: twigs: new growth densely appressed-pubescent, 1-year old gray, sometimes ± shiny, 2-years old and older dull gray; thorns on twigs numerous, ± recurved, 2-years old shiny black, 2.5–5 cm. Leaves: petiole 6–12 mm, length 25–33% blade, densely pubescent, eglandular; blade mid green, broadly ovate (base ± truncate) or broadly elliptic to rhombic-elliptic (base cuneate), 2.5–4 (–5) cm, lobes obscure or 1–3 per side, sinuses very shallow, lobe apex acute, margins serrate, teeth tips glandular, especially proximally, veins 4–6 per side, abaxial surface glabrate to tomentose, pubescent on veins, adaxial appressed-hairy young, becoming scabrous or glabrescent. Inflorescences 3–8-flowered; branches tomentose; bracteoles caducous, linear, membranous, margins stipitate-glandular, pubescent. Flowers 15 mm diam.; hypanthium tomentose; sepals narrowly triangular, 4–6 mm, margins glandular-serrate; stamens 10 [–20], anthers pink or rose; styles 5. Pomes brick-red to bright red, suborbicular, 7–11 mm diam., pubescent; sepals spreading or erose; pyrenes 5.2n = 68.


Phenology: Flowering Apr; fruiting Sep–Oct.
Habitat: Deciduous scrub, pastures, pinyon woodlands
Elevation: 300–700 m

Distribution

V9 930-distribution-map.jpg

Tex., Mexico (Coahuila), Mexico (Nuevo León)

Discussion

Of conservation concern.

Crataegus greggiana is a scarce plant of the Edwards Plateau of Texas; it is more common and variable in the Mexican Sierra Madre Oriental. It usually occurs in more xeric habitats than most Crataegus.

The stamens are always 10 in Texas but are often 20 in Mexico. Crataegus uvaldensis is a particularly tomentose form. A somewhat similar local species of the Edwards Plateau is 168. C. turnerorum (see there for differences).

Selected References

None.

Lower Taxa

None.
... more about "Crataegus greggiana"
pubescent +, glabrate +  and tomentose +
glabrescent +, scabrous +  and appressed-hairy +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
rose +  and pink +
James B. Phipps +
Eggleston +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
cuneate +  and truncate +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
broadly elliptic to rhombic-elliptic +  and ovate +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Gregg hawthorn +
Tex. +, Mexico (Coahuila) +  and Mexico (Nuevo León) +
not +  and aggregated +
300–700 m +
15 cm150 mm <br />0.15 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 />) +
older +, old +  and new +
appressed-pubescent +
dull +  and shiny +
Deciduous scrub, pastures, pinyon woodlands +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
craspedodromous +
glandular-serrate +  and serrate +
pubescent +  and stipitate-glandular +
serrate +  and crenate +
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 +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Flowering Apr +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
brick-red +  and bright red +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
suborbicular +
Bull. Torrey Bot. Club +
not arillate +
persistent +
free +  and distinct +
triangular +
nonaccrescent +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1-50-flowered +  and few-leaved +
Conservation concern +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrous +  and tomentose +
Crataegus uvaldensis +
Crataegus greggiana +
Crataegus (sect. Coccineae) ser. Greggianae +
species +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
straight +
slender +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
craspedodromous +  and gland-tipped +
inconspicuous +
less erect +  and oblique +
1 +  and several +
determinate +
4 +  and 6 +
tree +  and shrub +