Crataegus viridis var. nitens

(Sargent) J. B. Phipps

Novon 16: 387. 2006.

Endemic
Basionym: Crataegus nitens Sargent Rep. (Annual) Missouri Bot. Gard. 22: 76. 1912
Treatment appears in FNA Volume 9. Treatment on page 535. Mentioned on page 532.

Stems: trunk bark dark gray or black, rough, thinly exfoliating whitish to light gray areas; 1-year old twigs reddish-brown. Leaves: blade broadly elliptic to ovate, 3–4 cm, coriaceous, base ± rounded, lobes 0 or 1–3 per side, sinuses shallow to deep, max LII 5 (–20) %, margins crenate, teeth 1 mm, venation craspedodromous, veins 5 per side, apex subacute, surfaces glabrous except abaxially with tufts of hair in vein-axils. Inflorescences: branches glabrous. Flowers: hypanthium glabrous.


Phenology: Flowering Apr; fruiting Sep–Oct.
Habitat: Stream bluffs
Elevation: 100–200 m

Discussion

Variety nitens has been found near the northern limits of the Crataegus viridis complex near the Mississippi River at Hannibal. The leaves of var. nitens are more coriaceous than usual in C. viridis, the one-year twigs are usually a reddish brown, and the two-year twigs a darker gray. The variety may represent a hybrid with a member of ser. Pruinosae.

Selected References

None.

Lower Taxa

None.
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 +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
rounded +
Crataegus nitens +
6 cm60 mm <br />0.06 m <br /> (7 cm70 mm <br />0.07 m <br />) +
broadly elliptic +  and ovate +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
linear-filiform +
adnate +  and distinct +
crowded +, scattered +  and alternate +
not +  and aggregated +
100–200 m +
hard +  and mealy +
1.3 cm13 mm <br />0.013 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 redbrown +
older +  and new +
Stream bluffs +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
(3-)10(-50)-flowered +
crassinucellate +
deciduous +
craspedodromous +
serrate to obscurely +
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 +  and glabrous +
0.7 cm7 mm <br />0.007 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Flowering Apr +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
not pruinose +
yellow +, orange +  and deep red +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
orbicular +
not arillate +
persistent +
free +  and distinct +
triangular +
1-50-flowered +  and few-leaved +
shallow +  and deep +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
Virides +
Crataegus viridis var. nitens +
Crataegus viridis +
variety +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
straight +
slender +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
craspedodromous +
1 cm10 mm <br />0.01 m <br /> (?) +
inconspicuous +
thin-exfoliating +
less erect +  and oblique +
1 +  and several +
reddish-brown +
determinate +
few +  and abundant +
tree +  and shrub +