Pinus elliottii

Engelmann

Trans. Acad. Sci. St. Louis 4: 186, plates 1–3. 1880.

Common names: Slash pine
Endemic
Basionym: Pinus heterophylla (Elliott) Sudworth 1893,
Synonyms: Pinus taeda var. heterophylla Elliott
Treatment appears in FNA Volume 2.

Trees to 30m; trunk to 0.8m diam., straight to contorted; crown conic, becoming rounded or flattened. Bark orange to purple-brown, irregularly furrowed and cross-checked into large, irregularly rectangular, papery-scaly plates. Branches spreading to ascending; twigs stout (to ca. 1cm thick), orangebrown, aging darker brown, rough-scaly. Buds cylindric, silvery brown, 1.5–2cm; scale margins fringed. Leaves 2 or 3 per fascicle, spreading or ascending, persisting ca. 2 years, 15–20 (–23) cm × 1.2–1.5mm, straight, slightly twisted, pliant, yellow to blue-green, all surfaces with stomatal lines, margins finely serrulate, apex abruptly acute to acuminate; sheath 1–2cm, base persistent. Pollen cones cylindric, 30–40mm, purplish. Seed-cones maturing in 2 years, falling the year after seed-shed, single or in pairs, symmetric, lanceovoid before opening, ovoid or ovoid-cylindric when open, (7–) 9–18 (–20) cm, light chocolate brown, on stalks to 3cm; apophyses lustrous (as if varnished), slightly raised, strongly cross-keeled; umbo central, depressed-pyramidal, with short, stout prickle. Seeds ellipsoid, oblique-tipped; body 6–7mm, dark-brown; wing to 20mm.

Distribution

Ala., Fla., Ga., La., Miss., S.C., in subtropical and warm temperate areas worldwide

Discussion

Varieties 2 (native only in the flora).

Selected References

None.

Key

1 Seedlings essentially without grass stage, buds thus scattered on the stem; leaves mostly in 3s, sometimes in 2s on same shoot; resin canals 3-5 per leaf; base of open cone ± truncate. Pinus elliottii var. elliottii
1 Seedlings tending toward a grass stage, buds thus crowded on contracted stems; leaves mostly in 2s, sometimes in 3s on same shoot; resin canals 3-9 per leaf; base of open cone rounded. Pinus elliottii var. densa

"relatively thin" is not a number.

... more about "Pinus elliottii"
resinous +
abruptly acute +  and acuminate +
cross-keeled +
Robert Kral +
Engelmann +
orange;purple-brown +
persistent +
Pinus heterophylla +
dark-brown +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
spreading +  and ascending +
silvery brown +
conspicuous +
cylindric +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Slash pine +
18 cm180 mm <br />0.18 m <br /> (20 cm200 mm <br />0.2 m <br />) +
brown;light chocolate +
9 cm90 mm <br />0.09 m <br /> (18 cm180 mm <br />0.18 m <br />) +
falling +  and maturing +
ovoid-cylindric +, ovoid +  and lanceovoid +
flattened +, rounded +  and conic +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, S.C. +  and in subtropical and warm temperate areas worldwide +
sheathed +  and sessile +
rounded +, 2-3-angled +  and terete +
arranged +  and fascicles +
20 cm200 mm <br />0.2 m <br /> (23 cm230 mm <br />0.23 m <br />) +
yellow;blue-green +
straight +
persisting +
15 cm150 mm <br />0.15 m <br /> (20 cm200 mm <br />0.2 m <br />) +
ascending;spreading +
2 (?) +  and 3 (?) +
scale-like +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
rectangular +
not winged +  and 2-winged +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Trans. Acad. Sci. St. Louis +
fibrous;woody +
arranged +  and overlapping +
persistent +
flattened +
pliable +  and woody +
grouped +  and solitary +
long-persistent +
oblique-tipped +
persistent +
pendent;more or less erect +
ellipsoid +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
reduced;well-defined short +
3 cm30 mm <br />0.03 m <br /> (?) +
extended +
Pinus taeda var. heterophylla +
Pinus elliottii +
species +
decurrent +  and elongate +
straight +
darker brown +  and orangebrown +
depressed-pyramidal +
reduced +
0 cm0 mm <br />0 m <br /> (?) +  and 2 cm20 mm <br />0.02 m <br /> (?) +