Crataegus nananixonii

J. B. Phipps & O’Kennon

Sida 17: 569, fig. 1. 1997.

Common names: Nixon’s dwarf hawthorn
Endemic
Treatment appears in FNA Volume 9. Treatment on page 590. Mentioned on page 586.

Shrubs, 10–15 dm. Stems intricately branched; twigs: new growth reddish green, pubescent, 1-year old gray to gray-brown, older gray; thorns on twigs straight to slightly recurved, 2-years old dark dull gray, fine, 1–3 cm. Leaves: petiole length 20–40% blade, pubescence not recorded, gland-dotted; blade rhombic-ovate, 1.5–3.5 cm, base broadly cuneate, lobes 0 or with sinuses very shallow, margins ± irregularly serrate, some teeth gland-tipped, especially proximally, veins 3 per side, apex acute, abaxial surface glabrous, veins sparsely pubescent, adaxial sparsely scabrous young, glabrescent. Inflorescences 3–5-flowered; branches pubescent; bracteole margins short-stipitate-glandular. Flowers 12–15 mm diam.; hypanthium glabrous; sepals lanceolate, 4–5 mm, margins glandular, abaxially glabrous; petals slightly clawed; stamens 10, anthers rose-purple; styles 3–5. Pomes coppery red, suborbicular, 10 mm diam., glabrous; sepal remnants present or not, on collar, patent-reflexed; pyrenes 3–5.


Phenology: Flowering Apr; fruiting Sep–Oct.
Habitat: Open sandy sites
Elevation: 200 m

Discussion

Crataegus nananixonii is restricted to open sandy sites in Nacogdoches and nearby counties of eastern Texas. The species is a very dwarf and distinctive member of ser. Intricatae, similar to C. biltmoreana but with much smaller parts.

Selected References

None.

Lower Taxa

None.
... more about "Crataegus nananixonii"
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
rose-purple +
James B. Phipps +
J. B. Phipps & O’Kennon +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
cuneate +
Intricatae +
6 cm60 mm <br />0.06 m <br /> (9 cm90 mm <br />0.09 m <br />) +
rhombic-ovate +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
short-stipitate-glandular +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Nixon’s dwarf hawthorn +
not +  and aggregated +
less hard +  and mealy +
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 />) +
gray +  and gray-brown +
older +  and new +
Open sandy sites +
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 glandular-pectinate +
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 +
stipitate +  and sessile +
gland-dotted +
pubescence +
Flowering Apr +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
coppery red +
10 cm100 mm <br />0.1 m <br /> (?) +
suborbicular +
not arillate +
persistent +
free +  and distinct +
patent +  and reflexed +
lanceolate +
nonaccrescent +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1-50-flowered +  and few-leaved +
free +  and distinct +
persistent +
distinct +
exsert +  and lateral +
elongate +
pubescent +  and glabrous +
Crataegus sect. Flavae +  and Crataegus ser. +
Crataegus nananixonii +
Crataegus (sect. Coccineae) ser. Intricatae +
species +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
gray +  and dark +
straight +
slender +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
gland-tipped +
inconspicuous +
buff to gray-brown +  and corrugated +
less erect +  and oblique +
1 +  and several +
straight +
determinate +