Crataegus pruinosa var. magnifolia

(Sargent) J. B. Phipps

Novon 16: 386. 2006.

Conservation concernEndemic
Basionym: Crataegus magnifolia Sargent Trees & Shrubs 2: 69, plate 132. 1908
Treatment appears in FNA Volume 9. Treatment on page 577. Mentioned on page 575, 578.

Shrubs or trees, height not recorded. Leaves: blade ovate to ovate-deltate, 5–7 cm, length/width = 1.3–1.5, lobes 0 or 1–4 per side, obscure, lobe apex ± obtuse, base broadly cuneate to subtruncate, adaxial surface glabrous, sometimes sparsely appressed-hairy along veins. Inflorescence branches glabrous. Flowers 18 mm diam.; stamens 20, anthers cream.


Phenology: Flowering Apr; fruiting Sep–Oct.
Habitat: Chalk barrens, along rocky watercourses
Elevation: 100–200 m

Discussion

Of conservation concern.

Variety magnifolia, a local variant from Jasper County in southern Missouri, not seen for many years, is distinct for its remarkable leaf shape and cream anthers. It would be more consistent with the logic of this treatment to place var. magnifolia with Crataegus cognata, but the combination has not been made.

Selected References

None.

Lower Taxa

None.
appressed-hairy +  and glabrous +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
mauve +  and pink +
James B. Phipps +
(Sargent) J. B. Phipps +
orangebrown +
thin-exfoliating +  and corrugated +
compound +  and simple +
opposite +  and alternate +
broadly cuneate +  and subtruncate +
Crataegus magnifolia +
6 cm60 mm <br />0.06 m <br /> (7 cm70 mm <br />0.07 m <br />) +
mid +  and dark green +
ovate +  and ovate-deltate +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
villous +  and glabrous +
adnate +  and distinct +
crowded +, scattered +  and alternate +
not +  and aggregated +
100–200 m +
18 cm180 mm <br />0.18 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 />) +
paler +, gray +, purple-brown +  and reddish-brown +
older +, old +  and new +
Chalk barrens, along rocky watercourses +
constricted +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
sessile +  and craspedodromous +
glandular-serrate +  and serrate +
subentire +
glabrous +  and short-stipitate-glandular +
subentire +  and 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 (?) +
free +  and distinct +
post-mature +
glandular +
Flowering Apr +  and fruiting Sep–Oct. +
adnate +, free +, connate +  and distinct +
dark gray-brown +  and russet +
exfoliating +  and corrugated +
pruinose +
scarlet +, bright crimson +  and greenish +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
suborbicular +
not arillate +
persistent +
free +  and distinct +
triangular +
nonaccrescent +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1-50-flowered +  and few-leaved +
Conservation concern +  and Endemic +
free +  and distinct +
branched +  and simple +
persistent +
distinct +
exsert +  and lateral +
elongate +
Crataegus pruinosa var. magnifolia +
Crataegus pruinosa +
variety +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
purple +  and shiny black +
straight +
slender +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
craspedodromous +  and gland-tipped +
inconspicuous +
less erect +  and oblique +
1 +  and several +
straight +
determinate +
6 +  and 5 +
tree +  and shrub +