Banksia sessilis var. cygnorum

taxobox
name = "Banksia sessilis" var. "cygnorum"

---

regnum = Plantae
unranked_divisio = Angiosperms
unranked_classis = Eudicots
ordo = Proteales
familia = Proteaceae
genus = "Banksia"
species = "B. sessilis"
variety = "B. sessilis" var. "cygnorum"
trinomial = "Banksia sessilis" var. "cygnorum"
trinomial_authority = (Gand.) A.R.Mast & K.R.Thiele
synonyms = "Dryandra quinquedentata" Gand."Dryandra cygnorum" Gand. "Dryandra sessilis" var. "cygnorum" (Gand.) A.S.George |

"Banksia sessilis" var. "cygnorum" is a variety of "Banksia sessilis" (Parrot Bush).

Description

It grows as a shrub up to five metres high, with a down of fine hairs on the stems. This variety is has the smallest leaves of any "B. sessilis" variety, being no more than three centimetres long, and less than two centimetres wide. They are often wedge-shaped with a long, toothless lower margin, and as such are quite similar to those of "B. sessilis" var. "flabellifolia", only somewhat smaller, with a concave lower margin, sometimes with small lobes at the base, and often a much darker green. As with other varieties of "B. sessilis", the flowers are greenish-yellow. Each head contains from 55 to 65 flowers.cite book | first = Tony | last = Cavanagh | coauthords = Pieroni, Margaret | year = 2006 | title = The Dryandras | publisher = Melbourne: Australian Plants Society (SGAP Victoria); Perth: Wildflower Society of Western Australia | id = ISBN 1-876473-54-1] Flora of Australia Online | name = "Dryandra sessilis" var. "cordata" (Meisn.) A.S.George | id = 3532]

Taxonomy

This variety was first published by Michel Gandoger in 1919. Gandoger actually published two names: "Dryandra quinquedentata", based on specimen material collected from the Swan River by Arthur Mills Lea in 1902; and "Dryandra cygnorum", based on material collected by Alexander Morrison from the Swan River in the vicinity of Melville, on 31 Jul7 1897.cite journal | first = Michel | last = Gandoger | year = 1919 | title = Sertum plantarum novarum. Pars secunda | journal = Bulletin de la Societe Botanique de France | volume = 66 | pages = 216–233 | url = http://www.botanicus.org/item/31753002245360] In 1996, Alex George declared these two names to refer to the same plant, since Gandoger distinguished them only by the width of the leaves, the number of leaf teeth, and the length of the flower head, all of which are quite variable in this variety. He adopted the epithet "cygnorum", demoting it to a variety of "D. sessilis".cite journal | first = Alex | last = George | year = 1996 | title = New taxa and a new infrageneric classification in "Dryandra" R.Br. (Proteaceae: Grevilleoideae) | journal = Nuytsia | volume = 10 | issue = 3 | pages = 313–408] Gandoger did not explicitly give an etymology for the epithet "cygnorum", but it is assumed to be from the Latin "cygnorus" ("swan"), in reference to the Swan River, from whence it was first collected.

The current name of this variety arose in 2007, when Austin Mast and Kevin Thiele transferred "Dryandra" into "Banksia";cite journal | author = Mast, Austin R. and Kevin Thiele | year = 2007 | title = The transfer of Dryandra R.Br. to Banksia L.f. (Proteaceae) | journal = Australian Systematic Botany | volume = 20 | pages = 63–71 | doi = 10.1071/SB06016] thus the variety's current full name is "Banksia sessilis" var. "cygnorum" (Gand.) A.R.Mast & K.R.Thiele.APNI | name = "Banksia sessilis" var. "cygnorum" (Gand.) A.R.Mast & K.R.Thiele | id = 269986]

Distribution and habitat

"B. sessilis" var. "cygnorum" occurs along the coast of Western Australia from Dongara in the north, to south of Fremantle. It largely occurs near the coast, in sand over limestone; but it does occur further inland, at Kings Park and also around Lake Indoon.

Cultivation

This variety is little known in cultivation. It is suggested that cultivation requirements would be similar to the better-known "B. sessilis" var. "sessilis". Despite being a coastal plant, it has been reported as being frost-resistant down to -7°C.

References

External links

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