Pinaceae

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Pinaceae
Glacier-Lyman-Tamarack.jpg
Larix (golden), Abies (central foreground) and Pinus (right foreground)
Scientific classification e
Kingdom: Plantae
Division: Pinophyta
Class: Pinopsida
Order: Pinales
Family: Pinaceae
Lindley, 1836
Genera (no. of species)

Subfamily Pinoideae

  • Pinus – pines (c. 115)

Subfamily Piceoideae

  • Picea – spruces (c. 35)

Subfamily Laricoideae

Subfamily Abietoideae

The 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 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 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.

Description[edit]

Members of the family Pinaceae are trees (rarely shrubs) growing from 2 to 100 metres (7 to 300 ft) tall, mostly evergreen (except the deciduous Larix and Pseudolarix), resinous, monoecious, with subopposite or whorled branches, and spirally arranged, linear (needle-like) leaves.[1] The embryos of Pinaceae have 3–24 cotyledons.

The female cones are large and usually woody, 2–60 centimetres (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 dispersal is mostly by wind, but some species have large seeds with reduced wings, and are dispersed by birds. Analysis of 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 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 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 has been subject to debate in the past. 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 morphology of the cones, seeds and leaves:[4]

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

References[edit]

  1. ^ a b Aljos Farjon (1998). World Checklist and Bibliography of Conifers. Royal Botanic Gardens, Kew. ISBN 1-900347-54-7. 
  2. ^ Christopher J. Earle (ed.). "Pinus merkusii Junghuhn et de Vriese ex de Vriese 1845". The Gymnosperm Database. Retrieved March 17, 2015. 
  3. ^ 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. JSTOR 3545911. 
  4. ^ 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. JSTOR 2419217. 

Further reading[edit]

  • Heinz-Dietmar Behnke (1974). "Sieve element plastids of Gymnospermae: their ultrastructure and relation to systematics". 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 Conference. Acta Horticulturae 615 (Brugge: International Society for Horticultural Science): 107–114. 
  • Zsolt Debreczy, Istvan Racz (2012). Conifers Around the World. DendroPress. ISBN 9632190610. 

External links[edit]