Hakea petiolaris, commonly known as the sea-urchin hakea,[1] is a shrub or small tree with cream-coloured and pink or purple flowers and woody fruit. It is endemic to the south west of Australia, occurring at the coastal plain, jarrah forest and wheatbelt regions, often at the ancient granite outcrops of Western Australia.
Hakea petiolaris grows as an erect shrub or tree up to 9 m (30 ft) in height. The leaves have a distinctive pale-grey colour and are 5.5–15 cm (2–6 in) long and 2.5–6 cm (1–2 in) wide. The flowers are arranged in groups that appear on small branches or in the forks of branches. The groups are roughly spherical and contain 120 to 200 individual flowers. Each flower is 1.4–1.8 cm (0.6–0.7 in) long and white or cream in colour with the perianth, (the non-reproductive part of the flower) ranging in colour from pink to purple. Flowering is followed by woody seed capsules which are 2–3.5 cm (0.8–1 in) long and 1–2 cm (0.4–0.8 in) wide. Each capsule splits into valves and releases 2 dark brown or black winged seeds.[1]
Hakea petiolaris was first described by Carl Meissner in 1845, using a collection made at York by Ludwig Preiss.[2] The specific epithet (petiolaris) is derived from the Latin word petiolus meaning "small, slender stalk".[3]: 751 The Latin epithet petiolaris refers to the leaves presentation on conspicuous stalks.[4]
There are three subspecies, differing in the sizes of their leaves and the colour of the perianth as it ages.[4]
All three subspecies of H. petiolaris are listed as "not threatened" by the Western Australian Government Department of Parks and Wildlife.[7][10][16]
The species is propagated from seed, establishing itself as a large shrub, or a tree to around ten metres, the width is around two metres. The horticultural applications include use as a screening plant or hedge, or displayed as individual specimens. It is a fast growing and hardy species, frost resistant, bird attracting and has good potential as a feature plant.
Hakea petiolaris is recommended for the attractive appearance of its flowers and attraction for birds. Clusters of dullish red flowers, contrasted by white styles, are presented at the leaf axis in the austral autumn or winter. The plant is successfully grown in the urbanised sub-coastal regions of southern Australia.[18]
The most common subspecies in cultivation is H. petiolaris subsp. trichophylla.[4]
The presentation of flowers at the stem (cauliflory) may be a relictual characteristic of a time when tall forest dominated the region and pollinators such as birds moved within the dense leaf canopy of under-storey species.[19]
fruit Hakea petiolaris, commonly known as the sea-urchin hakea, is a shrub or small tree with cream-coloured and pink or purple flowers and woody fruit. It is endemic to the south west of Australia, occurring at the coastal plain, jarrah forest and wheatbelt regions, often at the ancient granite outcrops of Western Australia.
Hakea petiolaris, o Hakea erizo de mar, es un arbusto o árbol pequeño el cual es endémico del sureste de Australia Occidental.
Tiene tres subespecies.
Crece hasta 9 m de alto y tiene flores de color rosa y crema en racimos globulares los cuales aparecen desde otoño a invierno, seguidos por cápsulas leñosas de semillas las cuales miden de 2 a 3.5 cm de largo y de 1 a 2 cm de ancho. Las hojas tienen un distintivo color verde pálido y miden entre 5,5 a 15 cm × 2,5 a 6 cm.
Hakea petiolaris fue descrita por Carl Meissner y publicado en Plantae Preissianae 1: 577. 1845.[1]
Las hakeas fueron denominadas por el Barón Christian Ludwig von Hake, en el s.XVIII, el patrón alemán de la botánica.
Hakea petiolaris, o Hakea erizo de mar, es un arbusto o árbol pequeño el cual es endémico del sureste de Australia Occidental.
Tiene tres subespecies.
