Slash Pine Pinus Elliottii Seeds Shi Di Song
Pinus elliottii Engelmann, Trans. Acad. Sci. St. Louis. 4: 186, plates 1--3. 1880. Slash pine 湿地松 shi di song
Pinus heterophylla (Elliott) Sudworth, 1893, not K. Koch, 1849; P. taeda Linnaeus var. heterophylla Elliott
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), orange-brown, 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, lance-ovoid 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.
Varieties 2 (native only in the flora): introduced in subtropical and warm temperate areas worldwide. Cultivated. Anhui (Jing Xian), Fujian (Minhou Xian), Guangdong, Guangxi, Hubei (Wuhan Shi), Hunan, Jiangsu, Jiangxi (Ji’an Xian), Taiwan, Yunnan (Kunming Shi), Zhejiang [native to SE United States]
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. 24a var. elliottii
+ 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. 24b var. densa
Pinus elliottii var. densa Little & Dorman
Pinus elliottii var. elliottii
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