Isopogon formosus
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Isopogon formosus, commonly known as rose coneflower,[1] is a species of flowering plant in the family Proteaceae and is endemic to the south-west of Western Australia. It is a shrub with divided leaves with cylindrical segments, and spherical to oval heads of pink or red flowers.
Description
Isopogon formosus is an erect or spreading shrub that typically grows to a height of Template:Cvt with pale to reddish brown young branchlets. The leaves are up to Template:Cvt long on a petiole up to Template:Cvt long, and divided with grooved cylindrical segments that have a sharply-pointed tip. The flowers are arranged on the ends of branchlets or in upper leaf axils, in sessile, spherical to oval heads about Template:Cvt in diameter with egg-shaped to lance-shaped involucral bracts at the base. The flowers are red or mauve-pink and more or less glabrous, and the fruit is a hairy nut fused with others in a spherical or oval head up to Template:Cvt long in diameter.[2][3][1]
Taxonomy
Isopogon formosus was first formally described in 1810 by Robert Brown and the description was published in Transactions of the Linnean Society.[4][5] The specific epithet (formosus) is a Latin word meaning "beautifully-formed" or "handsome".[6]
In 1995, Donald Bruce Foreman described two subspecies of I. formosus in the Flora of Australia, and the names are accepted by the Australian Plant Census:
- Isopogon formosus subsp. dasylepis (Meisn.) Foreman[7][8] that has generally hairier stems, leaves and involucral bracts than the autonym and flowers mainly from June to December;[9]
- Isopogon formosus R.Br. subsp. formosus[10][11] is more or less glabrous and mainly flowers from May to November.[9]
Subspecies dasylepis was originally described in 1856 by Carl Meissner as I. formosus var. dasylepis in de Candolle's Prodromus Systematis Naturalis Regni Vegetabilis.[12][13]
In a 2017 paper in the journal Nuytsia, Rye and Hislop reduced I. heterophyllus to a synonym of I. formosus subsp. formosus, but the change has not been accepted by the Australian Plant Census as at November 2020.[9]
Distribution and habitat
Rose coneflower grows in a range of soils in swampy places, rocky outcrops and on sandplains mainly between Bunbury and Esperance in the Esperance Plains and Jarrah Forest biogeographic regions.[2] Subspecies dasylepis occurs between Busselton, Noggerup and the Scott River and subsp. formosus in near-coastal areas between Walpole and Hopetoun and from Dalyup to Cape Arid National Park.[9]
Conservation status
Subspecies formosus is classified as "not threatened"[8] but subsp. dasylepis is classified as "Priority Three" by the Government of Western Australia Department of Parks and Wildlife[11] meaning that it is poorly known and known from only a few locations but is not under imminent threat.[14]
Use in horticulture
Isopogon formosus requires excellent drainage and full sun. It will not tolerate long periods of dryness or heavy frost.[1][15]
References
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