“Banksia sessilis var. cordata”的意思、由来-开放百科全书

Banksia sessilis var. cordata is a variety of Banksia sessilis (Parrot Bush), with unusually large leaves and flower heads. It is a rare variety that is restricted to the extreme south-west corner of Western Australia.

Description

This variety is similar to other varieties of B. sessilis, but has larger leaves; these may be up to six centimetres long and four centimetres wide in this variety, whereas in B. sessilis var. sessilis they are commonly two to three centimetres long. The leaves of this variety are also a darker green than the other varieties, and its flower heads are generally larger.^[1]^[2]

Taxonomy

This variety was first published as a variety of Dryandra floribunda (now B. sessilis) by Carl Meissner in the second volume of Plantae Preissianae, published in 1848. It was based on a type specimen collected by James Drummond; this specimen was said to have been collected at the Swan River, where this variety does not now occur. Meissner did not explicitly give an etymology for the varietal epithet, but referred to the leaves as cordatis,^[3] Latin for "heart-shaped", and this is now universally recognised as the source of the name.^[1]

In 1870, George Bentham published what is now recognised as a synonym of this variety, as D. floribunda var. major. Bentham's taxon was based on a specimen collected at Cape Naturaliste by Augustus Oldfield. He also attributed to this variety a painting of D. floribunda that appeared in Curtis's Botanical Magazine in 1813.^[4]

Distribution and habitat

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, but that this variety would be better suited to cooler, wetter areas.^[1]

Conservation

On the Department of Environment and Conservation's Declared Rare and Priority Flora List, B. sessilis var. cordata is rated "Priority 4 - Rare", meaning that it has been adequately surveyed, and does not appear to be threatened, even though it is rare.^[8]

References

1. ^¹²³{{Cite book | first1 = Tony | last1 = Cavanagh | last2 = Pieroni | first2 = Margaret | authorlink2 = Margaret Pieroni | year = 2006 | title = The Dryandras | publisher = Melbourne: Australian Plants Society (SGAP Victoria); Perth: Wildflower Society of Western Australia | isbn = 1-876473-54-1}}
2. ^{{Flora of Australia Online | name = Dryandra sessilis var. cordata (Meisn.) A.S.George | id = 46405}}
3. ^{{Cite encyclopedia | first = Carl | last = Meissner | authorlink=Carl Meissner | year = 1845 | title = Dryandra | editor = Lehmann, Johann | editor-link = Johann Georg Christian Lehmann | encyclopedia = Plantae Preissianae | volume = II | publisher = Meissner | location = Hamburg | url = https://www.biodiversitylibrary.org/item/9228 | accessdate = 2008-06-01}}
4. ^{{Cite encyclopedia | author = Bentham, George | year = 1870 | title = Dryandra | encyclopedia = Flora Australiensis | volume = Volume 5: Myoporineae to Proteaceae | pages = 562–584 | location = London | publisher = L. Reeve & Co. | authorlink = George Bentham}}
5. ^{{Cite journal | first = Alex | last = George | authorlink = Alex 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}}
6. ^{{Cite journal | last1 = Mast | first1 = Austin R. | authorlink1 = Austin Mast | last2 = Thiele | first2 = Kevin | authorlink2 = 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}}
7. ^{{APNI | name = Banksia sessilis var. cordata (Meisn.) A.R.Mast & K.R.Thiele | id = 269985}}
8. ^{{FloraBase | name = Banksia sessilis var. cordata (Meisn.) A.R.Mast & K.R.Thiele | id = 32078}}