Rudbeckia laciniata
Schlitzblättriger coneflower ( Rudbeckia laciniata )
The Cut- coneflower ( Rudbeckia laciniata ) is a species within the genus Rudbeckia (Rudbeckia ) in the family Asteraceae (Asteraceae).
Description
The Cut- coneflower grows as a perennial herbaceous plant, reaching heights of growth from 50 to 300 centimeters. Are formed as outlasting with fibrous roots long rhizomes. The stem is bare. The change-constant leaves are usually stalked and divided. The smooth or hairy leaf blade is pinnate or simple one-to two-fold. The leaflets are lobed three to eleven times. The leaf margin serrate smooth to coarse. The lower leaves are 15-50 cm long and 10-25 cm wide. The upper sheets have a length of 8 to 40 and a width of 3 to 20 cm.
In schirmtraubigen total inflorescences are two to 25 basket- shaped part inflorescences together. On long stems are the flower heads, which have a diameter of 7 to 15 centimeters. 8 to 15 irregularly arranged, foliage leaf -like, smooth or hairy bracts have a length of up to 2 cm and usually a ciliated border. The inflorescence soil is nearly spherical to conical. The chaff sheets have a length of 3 to 7 mm. In a flower head are eight to twelve florets ( ray florets ) and from 150 to over 300 tubular flowers ( disc florets ) together. The golden-yellow ray florets have a length of 15 to 50 cm and a width of 4 to 14 mm inches and are beaten back later. The yellow to yellowish- green ( olive ) tubular flowers have a length of 9 to 30 mm and a diameter of 10 to 23 mm, with yellow 3.5 to 5 mm long Kronlappen. The stylus branches have a length of 1 to 1.5 mm. The flowering period extends from July to September.
The 3 to 4.5 mm long achenes have a crown-shaped or consisting of four up to 1.5 mm long pappus scales.
Occurrence
The Cut- Coneflower is native to North America and particularly widespread in the east. As an ornamental plant it is often cultivated in gardens filled molds. In Europe it feral in different countries. In Germany he is since around 1830 before growing wild and is considered naturalized neophyte. He lives in the Staudengesellschaften on the banks of flowing waters and alluvial forests.
System
Rudbeckia laciniata belongs to the section Macro Cline Torrey & A. Gray in the genus Rudbeckia L..
There are five varieties within the species Rudbeckia laciniata L.:
- Rudbeckia laciniata var ampla ( A.Nelson ) Cronquist in CLHitchcock et al.: It is native to the western Great Plains.
- Rudbeckia laciniata var bipinnata Perdue
- Rudbeckia laciniata var humilis A.Gray in A. Gray et al.: It grows at altitudes 70-1500 meters.
- Rudbeckia laciniata var heterophylla ( Torrey & A. Gray ) Fernald & BGSchubert: it is known only from the Levy County.
- Rudbeckia laciniata L. var laciniata
Swell
- Lowell E. Urbatsch & Patricia B. Cox: Rudbeckia in the Flora of North America, Volume 21, page 49: Rudbeckia laciniata - Online.