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Subfamily Pinoideae

Pinus
Pinus
– pines (c. 115)

Subfamily Piceoideae

Picea
Picea
– spruces (c. 35)

Subfamily Laricoideae

Cathaya
Cathaya
(1 species) Larix
Larix
– larches (about 14) Pseudotsuga
Pseudotsuga
– Douglas-firs (5)

Subfamily Abietoideae

Abies
Abies
– firs (about 50) Cedrus
Cedrus
– cedars (2–4) Keteleeria
Keteleeria
(3) Nothotsuga
Nothotsuga
(1) Pseudolarix
Pseudolarix
– golden larch (1) Tsuga
Tsuga
– hemlock (9)

The Pinaceae
Pinaceae
(pine family) are trees or shrubs, including many of the well-known conifers of commercial importance such as cedars, firs, hemlocks, larches, pines and spruces. The family is included in the order Pinales, formerly known as Coniferales. Pinaceae
Pinaceae
are supported as monophyletic by their protein-type sieve cell plastids, pattern of proembryogeny, and lack of bioflavonoids. They are the largest extant conifer family in species diversity, with between 220 and 250 species (depending on taxonomic opinion) in 11 genera,[1] and the second-largest (after Cupressaceae) in geographical range, found in most of the Northern Hemisphere, with the majority of the species in temperate climates, but ranging from subarctic to tropical. The family often forms the dominant component of boreal, coastal, and montane forests. One species, Pinus
Pinus
merkusii, grows just south of the equator in Southeast Asia.[2] Major centres of diversity are found in the mountains of southwest China, Mexico, central Japan, and California.

Contents

1 Description 2 Classification 3 References 4 Further reading 5 External links

Description[edit]

Pine
Pine
forest in Vagamon, southern Western Ghats, Kerala (India)

Members of the family Pinaceae
Pinaceae
are trees (rarely shrubs) growing from 2 to 100 m (7 to 300 ft) tall, mostly evergreen (except the deciduous Larix
Larix
and Pseudolarix), resinous, monoecious, with subopposite or whorled branches, and spirally arranged, linear (needle-like) leaves.[1] The embryos of Pinaceae
Pinaceae
have three to 24 cotyledons. The female cones are large and usually woody, 2–60 cm (1–24 in) long, with numerous spirally arranged scales, and two winged seeds on each scale. The male cones are small, 0.5–6.0 cm (0.2–2 in) long, and fall soon after pollination; pollen dispersal is by wind. Seed
Seed
dispersal is mostly by wind, but some species have large seeds with reduced wings, and are dispersed by birds. Analysis of Pinaceae
Pinaceae
cones reveals how selective pressure has shaped the evolution of variable cone size and function throughout the family. Variation in cone size in the family has likely resulted from the variation of seed dispersal mechanisms available in their environments over time. All Pinaceae
Pinaceae
with seeds weighing less than 90 mg are seemingly adapted for wind dispersal. Pines having seeds larger than 100 mg are more likely to have benefited from adaptations that promote animal dispersal, particularly by birds.[3] Pinaceae
Pinaceae
that persist in areas where tree squirrels are abundant do not seem to have evolved adaptations for bird dispersal. Boreal conifers have many adaptions for winter. The narrow conical shape of northern conifers, and their downward-drooping limbs help them shed snow, and many of them seasonally alter their biochemistry to make them more resistant to freezing, called "hardening". Classification[edit] Classification of the subfamilies and genera of Pinaceae
Pinaceae
has been subject to debate in the past. Pinaceae
Pinaceae
ecology, morphology, and history have all been used as the basis for methods of analyses of the family. An 1891 publication divided the family into two subfamiles, using the number and position of resin canals in the primary vascular region of the young taproot as the primary consideration. In a 1910 publication, the family was divided into two tribes based on the occurrence and type of long–short shoot dimorphism. A more recent classification divided the subfamilies and genera based on the consideration of features of ovulate cone anatomy among extant and fossil members of the family. Below is an example of how the morphology has been used to classify Pinaceae. The 11 genera are grouped into four subfamilies, based on the microscopical anatomy and the morphology of the cones, pollen, wood, seeds, and leaves:[4]

Subfamily Pinoideae
Pinoideae
(Pinus): cones are biennial, rarely triennial, with each year's scale-growth distinct, forming an umbo on each scale, the cone scale base is broad, concealing the seeds fully from abaxial view, the seed is without resin vesicles, the seed wing holds the seed in a pair of claws, leaves have primary stomatal bands adaxial (above the xylem) or equally on both surfaces. Subfamily Piceoideae
Piceoideae
(Picea): cones are annual, without a distinct umbo, the cone scale base is broad, concealing the seeds fully from abaxial view, seed is without resin vesicles, blackish, the seed wing holds the seed loosely in a cup, leaves have primary stomatal bands adaxial (above the xylem) or equally on both surfaces. Subfamily Laricoideae
Laricoideae
(Larix, Pseudotsuga, and Cathaya): cones are annual, without a distinct umbo, the cone scale base is broad, concealing the seeds fully from abaxial view, the seed is without resin vesicles, whitish, the seed wing holds the seed tightly in a cup, leaves have primary stomatal bands abaxial (below the phloem vessels) only. Subfamily Abietoideae (Abies, Cedrus, Pseudolarix, Keteleeria, Nothotsuga, and Tsuga): cones are annual, without a distinct umbo, the cone scale base is narrow, with the seeds partly visible in abaxial view, the seed has resin vesicles, the seed wing holds the seed tightly in a cup, leaves have primary stomatal bands abaxial (below the phloem vessels) only.

References[edit]

^ a b Aljos Farjon (1998). World Checklist and Bibliography of Conifers. Royal Botanic Gardens, Kew. ISBN 1-900347-54-7.  ^ Christopher J. Earle (ed.). " Pinus
Pinus
merkusii Junghuhn et de Vriese ex de Vriese 1845". The Gymnosperm Database. Retrieved March 17, 2015.  ^ Craig W. Benkman (1995). "Wind dispersal capacity of pine seeds and the evolution of different seed dispersal modes in pines" (PDF). Oikos. 73 (2): 221–224. doi:10.2307/3545911. JSTOR 3545911.  ^ Robert A. Price, Jeanine Olsen-Stojkovich & Jerold M. Lowenstein (1987). "Relationships among the genera of Pinaceae: an immunological comparison". Systematic Botany. 12 (1): 91–97. doi:10.2307/2419217. JSTOR 2419217. 

Further reading[edit]

Heinz-Dietmar Behnke (1974). "Sieve element plastids of Gymnospermae: their ultrastructure and relation to systematics". Plant
Plant
Systematics and Evolution. 123 (1): 1–12. doi:10.1007/BF00983281.  D. F. Greene & E. A. Johnson (1990). "The dispersal of winged fruits and seeds differing in autorotative behavior". Canadian Journal of Botany. 68 (12): 2693–2697. doi:10.1139/b90-340.  A. Liston, D. S. Gernandt, T. F. Vining, C. S. Campbell & D. Piñero (2003). R. R. Mill, ed. Molecular phylogeny of Pinaceae and Pinus. Proceedings of the Fourth International Conifer
Conifer
Conference. Acta Horticulturae. 615. Brugge: International Society for Horticultural Science. pp. 107–114. CS1 maint: Multiple names: authors list (link) Zsolt Debreczy; Istvan Racz (2012). Conifers Around the World. DendroPress. ISBN 9632190610. 

External links[edit]

Arboretum de Villardebelle French Arboretum of conifers around the world Gymnosperm Database – Pinaceae Pinaceae
Pinaceae
on the web page of the Tree-of-Life project 40 Pine
Pine
Trees From Around the World by The Spruce Key to Pinaceae
Pinaceae
from the Jepson Manual, covers Californian species and much of western North America Pinaceae
Pinaceae
in Flora of North America Pinus
Pinus
in USDA Plants Database

v t e

Pinophyta
Pinophyta
families

Pinaceae Araucariaceae Podocarpaceae Sciadopityaceae Cupressaceae Cephalotaxaceae Taxaceae

Taxon identifiers

Wd: Q101680 EoL: 6747 EPPO: 1PINF FloraBase: 22737 FNA: 10691 FoC: 10691 Fossilworks: 54794 GBIF: 3925 GRIN: 879 IPNI: 30000468-2 ITIS: 18030 NCBI: 3318 Tropicos: 42000417 VASCAN: 189

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