Crataegus viridis var. glabriuscula

(Sargent) J. B. Phipps

Novon 16: 386. 2006.

Endemic
Basionym: Crataegus glabriuscula Sargent Bot. Gaz. 31: 235. 1901
Synonyms: C. sutherlandensis Sargent
Treatment appears in FNA Volume 9. Treatment on page 534. Mentioned on page 531, 532, 533.

Stems: trunk bark whitish, exfoliating, smooth; compound thorns on trunks sometimes present; 1-year old twigs tan to reddish-brown. Leaves: blade ± orbiculate to narrowly ovate, oblong, rhombic-elliptic, or narrowly obovate, 2–4 cm, thin to chartaceous, base cuneate, lobes 0, or 1 or 2 per side, if present, very short, lobe apices acute, margins usually sharply serrate, teeth 1.5–2 mm, venation craspedodromous, veins 3 (or 4) per side, apex acute to obtuse, surfaces glabrous except abaxially with tufts of hair in vein-axils, adaxially short-pubescent young, glabrescent. Inflorescences 3–12-flowered; branches glabrous. Flowers: hypanthium glabrous.


Phenology: Flowering Apr; fruiting Sep–Nov.
Habitat: Rich moist soil near streams, blackland soil
Elevation: 10–200 m

Discussion

Variety glabriuscula is common in the eastern half of Texas and Oklahoma and extends to southeastern Kansas, to western Arkansas, possibly to Louisiana, and probably to southern Missouri.

Variety glabriuscula is weakly distinguished in the north of its range from var. viridis because of intermediates such as Crataegus furcata Sargent and C. lutensis Sargent [= C. viridis var. lutensis (Sargent) E. J. Palmer]. The variety is also somewhat distinguished by smaller leaves from forms of var. ovata, which, however, are almost perfectly allopatric. The mature bark of some specimens is described as the smoothest of the viridis group, near white, with finely exfoliating large flakes. Bark characteristics (and habitat) are also credited with helping to distinguish C. blanda (see under var. ovata). Variety glabriuscula represents a distinct southwestern regional variant of the species.

Specimens with fruit diameter in the 8–10 mm range sometimes found in the Dallas area may be hybrids with Crataegus reverchonii. The rare C. desertorum Sargent, known from Bandera and Uvalde counties, Texas, is distinguished by the scrubbier nature of the plant, zigzag twigs, greater thorniness, frequently ovate leaves that are distinctly and bluntly lobed, persistent, dense pubescence on the petioles, and semipersistent pilosity on the abaxial leaf surface.

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 +
cuneate +
Crataegus glabriuscula +
6 cm60 mm <br />0.06 m <br /> (7 cm70 mm <br />0.07 m <br />) +
less orbiculate +  and narrowly ovate oblong rhombic-elliptic or narrowly obovate +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
linear-filiform +
adnate +  and distinct +
crowded +, scattered +  and alternate +
Ark. +, Kans. +, Okla. +  and Tex. +
not +  and aggregated +
10–200 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 +
Rich moist soil near streams, blackland soil +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
craspedodromous +
serrate +  and crenate +
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–Nov. +
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 +
deep +  and shallow +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
glabrescent +, short-pubescent +  and glabrous +
C. sutherlandensis +
Crataegus viridis var. glabriuscula +
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 +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
inconspicuous +
whitish to light gray +  and rough +
exfoliating +
less erect +  and oblique +
1 +  and several +
tan +  and reddish-brown +
determinate +
few +  and abundant +
tree +  and shrub +