Hieracium Lachenalii
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''Hieracium lachenalii'', or common hawkweed, is a species of plant in the tribe
Cichorieae The Cichorieae (also called Lactuceae) are a tribe in the plant family Asteraceae that includes 93 genera, more than 1,600 sexually reproductive species and more than 7,000 apomictic species. They are found primarily in temperate regions of the E ...
within the family
Asteraceae Asteraceae () is a large family (biology), family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the Order (biology), order Asterales. The number of species in Asteraceae is rivaled only by the Orchi ...
. It is native to Europe but has become established as a weed in Australia and parts of North America.


Taxonomy

The species was widely known for many years as ''H. vulgatum'', but more recent studies have indicated that the two names represent the same species. The name ''H. lachenalii'' was coined in 1802, and ''H. vulgatum'' in 1819, so per taxonomic regulations, the older name is to be used, with ''H. vulgatum'' delegated to being a
synonym A synonym is a word, morpheme, or phrase that means precisely or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are a ...
.


Description

This common weed can grow and produce flowers on plants that range from to tall. The
rhizome In botany and dendrology, a rhizome ( ) is a modified subterranean plant stem that sends out roots and Shoot (botany), shoots from its Node (botany), nodes. Rhizomes are also called creeping rootstalks or just rootstalks. Rhizomes develop from ...
is short and stout. The broadly elliptic leaves can be up to long and taper with teeth towards the base. Each flower head has 40-80
ray florets Asteraceae () is a large family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the order Asterales. The number of species in Asteraceae is rivaled only by the Orchidaceae, and which is the larger fa ...
but no
disc floret Asteraceae () is a large family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the order Asterales. The number of species in Asteraceae is rivaled only by the Orchidaceae, and which is the larger fa ...
s.
Bract In botany, a bract is a modified or specialized leaf, associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are usually different from foliage leaves in size, color, shape or texture. They also lo ...
s surround the flower head; the receptacle ( basal part of the flower on which the florets are attached) is flat and naked; heads tend to start together then become somewhat solitary on long leafless stems. The stalks below the heads are covered with scattered, simple and gland-tipped black hairs and contain a milky substance. The pale
yellow Yellow is the color between green and orange on the spectrum of light. It is evoked by light with a dominant wavelength of roughly 575585 nm. It is a primary color in subtractive color systems, used in painting or color printing. In t ...
flowers are produced during all of the
summer Summer or summertime is the hottest and brightest of the four temperate seasons, occurring after spring and before autumn. At or centred on the summer solstice, daylight hours are the longest and darkness hours are the shortest, with day ...
month A month is a unit of time, used with calendars, that is approximately as long as a natural phase cycle of the Moon; the words ''month'' and ''Moon'' are cognates. The traditional concept of months arose with the cycle of Moon phases; such lunar mo ...
s. The fruit are dark brown
achenes An achene (; ), also sometimes called akene and occasionally achenium or achenocarp, is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate (formed from one carpel) and indehiscent (they do not open ...
.


Common names

* * * * * * * * * * * * * *


Distribution and habitat

Native to most of Europe, ''Hieracium lachenalii'' was introduced to temperate parts of North America,Biota of North America Program 2014 state-level distribution map
/ref> and to Australia. It can sometimes be found in soils that have been disturbed.


Europe

In Europe, the species is found in
Austria Austria, formally the Republic of Austria, is a landlocked country in Central Europe, lying in the Eastern Alps. It is a federation of nine Federal states of Austria, states, of which the capital Vienna is the List of largest cities in Aust ...
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,
Belgium Belgium, officially the Kingdom of Belgium, is a country in Northwestern Europe. Situated in a coastal lowland region known as the Low Countries, it is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeas ...
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,
Croatia Croatia, officially the Republic of Croatia, is a country in Central Europe, Central and Southeast Europe, on the coast of the Adriatic Sea. It borders Slovenia to the northwest, Hungary to the northeast, Serbia to the east, Bosnia and Herze ...
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, the
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, Luxemburg,
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North America

Subarctic America:
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. Canada: Provinces of
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References


External links

* * * * * {{Taxonbar, from=Q1521028 lachenalii Flora of Europe Plants described in 1802