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Rhododendron subg. Rhododendron

Rhododendron subg. Rhododendron
Rhododendron ferrugineum
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Ericales
Family: Ericaceae
Genus: Rhododendron
Subgenus: Rhododendron subg. Rhododendron
L.
Type species
Rhododendron ferrugineum
Sections

See text

Rhododendron hirsutum
A species of the Vireya section.

Rhododendron subgenus Rhododendron is a subgenus of the genus Rhododendron. With around 400 species, it is the largest of the eight subgenera (more recently reduced to five)[1] containing nearly half of all known species of Rhododendron and all of the lepidote (scales on the underside of the leaves) species.[1][2]

Taxonomy

Main article: List of Sections in Subgenus Rhododendron

The subgenus has traditionally included three sections:

However, following phylogenetic analysis, Craven (2008) raised the appropriately named Pseudovireya subsection of Vireya to section rank, splitting it into two geographic clades, the Asian mainland species as Pseudovireya, and the Malesian species as Discovireya, making five sections in all.[4] The new sections are thus:

Characteristics: (Craven 2008)

  • Discovireya: Scales entire to undulate; corolla tubular-cylindric; stamens 10, exserted to included, staminal filaments glabrous or hairy from the base; capsule valves not twisting after dehiscence; seeds with a distinct tail at each end
  • Pogonanthum: Scales incised; corolla salver-shaped; stamens 5–8, included, staminal filaments glabrous or hairy towards the base; capsule valves not twisting after dehiscence; seeds without distinct tails
  • Pseudovireya: Scales entire; corolla campanulate; stamens 10, exserted, staminal filaments glabrous proximally and distally and hairy in the middle region; capsule valves not twisting after dehiscence; seeds with a distinct tail at each end
  • Rhododendron: Scales entire to crenulate; corolla campanulate to funnel-shaped or tubular; stamens 10, exserted, staminal filaments hairy towards the base or glabrous; capsule valves not twisting after dehiscence; seeds without distinct tails
  • Vireya: Scales sessile or sometimes stalked, lobed to deeply incised or sometimes entire; corolla campanulate, trumpet-like, salver-shaped, tubular or funnel-shaped; stamens (5–)10(–16), exserted to included, staminal filaments glabrous or hairy from the base; capsule valves twisting after dehiscence; seeds with a distinct tail at each end

Craven also provides a formal Key to the subgenus.

Subsections

References

  1. ^ a b Goetsch, Loretta A.; Eckert, Andrew J.; Hall, Benjamin D. (July–September 2005). "The molecular systematics of Rhododendron (Ericaceae): a phylogeny based upon RPB2 gene sequences". Systematic Botany. 30 (3): 616–626. doi:10.1600/0363644054782170. S2CID 51949019.
  2. ^ Chamberlain, DF; Hyam R; Argent G; Fairweather G; Walter KS (1996). The genus Rhododendron: its classification and synonymy. Royal Botanic gardens Edinburgh. ISBN 1-872291-66-X. Archived from the original on July 14, 2014. Retrieved July 3, 2014.
  3. ^ Argent, G. Rhododendrons of subgenus Vireya. 2006. Royal Horticultural Society. ISBN 1-902896-61-0
  4. ^ Craven, L.A.; Goetsch, L.A.; Hall, B.D.; Brown, G.K. (2008). "Classification of the Vireya group of Rhododendron (Ericaceae)". Blumea - Biodiversity, Evolution and Biogeography of Plants. 53 (2): 435. doi:10.3767/000651908X608070.

Bibliography


Quelle: http://en.wikipedia.org/wiki/Rhododendron_subgenus_Rhododendron