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Pycnosorus is a genus of six species of plants in the family Asteraceae. Commonly known as billy buttons or drumsticks, they are annual or perennial herbs or small shrubs with a cylindrical to spherical head of up to 200 daisy-like "flowers". Each "flower" is a pseudanthium consisting of between three and eight florets surrounded by bracts. The petals are joined to form a small tube and the florets with their surrounding bracts are yellow or golden-yellow.
Plants in the genus Pycnosorus are annual or perennial herbs, with leaves decreasing in size up the stem, those at the base withering first. The flowers are arranged in oval to more or less spherical heads of 40 to 200 flower-like partial heads. Each partial head consists of three to eight small flower-like "florets". The florets and the bracts which surround them are yellow or golden in colour. Each flower has five petals joined to form a tube. After pollination the flowers become silky achenes with a ring of feathery bristles.[2][3]
Plants in the closely related genus Craspedia are also known by the common name "billy buttons" but have their flowers on small stalks rather than attached directly to the receptacle ("sessile") as in Pycnosorus.[4][2] There is some evidence that the two genera may in fact be monophyletic.[5]
The genus was first formally described in 1837 by George Bentham and the description was published in Enumeratio plantarum quas in Novae Hollandiæ ora austro-occidentali ad fluvium Cygnorum et in sinu Regis Georgii collegit Carolus Liber Baro de Hügel .[6] Bentham nominated Pycnosorus globosus as the type species.[7] The genus name (Pycnosaurus) is derived from the Ancient Greek words pyknos meaning "dense" or "thick" [8]: 644 and soros meaning "heap".[8]: 728
The following is a list of species of Pycnosorus accepted by the Australian Plant Census as at 30 November 2019:
All six species of Pycnosorus are endemic to Australia and there are species in all states except Tasmania. Most species grow in heavy, often rocky soils.[2]
Pycnosorus is a genus of six species of plants in the family Asteraceae. Commonly known as billy buttons or drumsticks, they are annual or perennial herbs or small shrubs with a cylindrical to spherical head of up to 200 daisy-like "flowers". Each "flower" is a pseudanthium consisting of between three and eight florets surrounded by bracts. The petals are joined to form a small tube and the florets with their surrounding bracts are yellow or golden-yellow.
Pycnosorus es un género de plantas con flores perteneciente a la familia Asteraceae. Son nativas de Australia donde crece en lugares húmedos. Comprende 8 especies descritas y de estas, solo 6 aceptadas.[1][2]
Las hojas son lineales y forman rosetas basales. Tienen color desde blanco al color verde hierba, están cubiertas por una fina pelusa. Las flores son hemisféricas o esféricas y están formadas por gran cantidad de diminutas flores.
Pycnosorus globosa es una planta ornamental exportada al mundo desde los cultivos del Río Murray. El género se puede propagar por semillas o cortando un rosetón y trasplantarlo.
El género está relacionado con Craspedia. Una forma de distinguir el género es observar si las flores individuales salen directamente de la base (Pycnosorus) o de los pequeños tallos aéreos (Craspedia) [1].
El género fue descrito por George Bentham y publicado en Enumeratio plantarum quas in Novae Hollandiae ora austro-occidentali ad fluvium Cygnorum et in sinu Regis Georgii collegit Carolus Liber Baro de Hügel 63. 1837.[3] La especie tipo es: Pycnosorus globosus F.L.Bauer ex Benth.
A continuación se brinda un listado de las especies del género Pycnosorus aceptadas hasta agosto de 2012, ordenadas alfabéticamente. Para cada una se indica el nombre binomial seguido del autor, abreviado según las convenciones y usos.
Pycnosorus es un género de plantas con flores perteneciente a la familia Asteraceae. Son nativas de Australia donde crece en lugares húmedos. Comprende 8 especies descritas y de estas, solo 6 aceptadas.
Pycnosorus là một chi thực vật có hoa trong họ Cúc (Asteraceae).[1]
Chi Pycnosorus gồm các loài:
Pycnosorus là một chi thực vật có hoa trong họ Cúc (Asteraceae).
