Hieracium robustum

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Hieracium robustum
Hieracium × robustum (2018) .jpg

Hieracium robustum

Systematics
Order : Astern-like (Asterales)
Family : Daisy family (Asteraceae)
Subfamily : Cichorioideae
Tribe : Cichorieae
Genre : Hawkweed ( Hieracium )
Type : Hieracium robustum
Scientific name
Hieracium robustum
Fr.

Hieracium robustum is a plant from the genus of hawkweed ( Hieracium ) within the family of Compositae (Asteraceae). It occurs from Southeast and Eastern Europe across Central Asia to China.

description

Vegetative characteristics

Hieracium robustum is a perennial herbaceous plant that reaches heights of 40 to 120 centimeters. It forms thick rhizomes . The stiff and upright stems are branched in the upper part and stand together individually or in small numbers in clusters. They are colored purple at the base and occasionally sparsely covered with simple hair, but otherwise the stems are mostly hairless.

At the base of the stem there are several basal leaves which, like the leaves in the lower stem area, fall off after the flowering period, while there are also 10 to 80 sessile leaves on the middle and upper stem. The somewhat glauke leaf blade is egg-shaped to narrowly elliptical-lanceolate with a length of 5 to 9 centimeters and a width of 1.5 to 3 centimeters with a heart-shaped or rounded blade base and a pointed to briefly pointed tip. The margins of the spread are full or deeply serrated. The pale green underside of the leaf has a reticulate leaf vein, which, like the leaf margins, can be sparsely covered with simple or star-shaped hairs.

Generative characteristics

At least in Xinjiang, the flowering period and fruit ripeness extend from July to October. The umbrella-like to elongated- panicle total inflorescence contains 10 to 80 cup-shaped partial inflorescences. With a diameter of 0.9 to 1.2 centimeters, the bell-shaped involucre contains several rows of green to dark green and hairy bracts on the underside . With a length of 2 to 3 millimeters and a width of about 1 millimeter, the outer bracts are lanceolate through linear to broadly linear, while the lanceolate middle bracts are 4 to 7 millimeters long and about 1 millimeter wide and the likewise lanceolate inner bracts 8 to 12 millimeters long and about 1 millimeter wide. The flower heads contain several yellow ray-florets .

The blackish brown achenes are cylindrical with a length of about 0.3 centimeters and have ten ribs. The pappus consists of several pale yellow bristle hairs, which are about 0.6 inches long.

Chromosome number

The chromosome number is 2n = 27 or 36.

Occurrence

The natural range of Hieracium robustum covers large parts of Eurasia . It extends from Southeast and Eastern Europe through Southwest Asia , Kazakhstan , India and Russia to the Uyghur Autonomous Region of Xinjiang .

Hieracium robustum thrives in Xinjiang in meadows and on slopes at altitudes of 1700 to 2100 meters.

Taxonomy

It was first described as Hieracium robustum in 1848 by Elias Magnus Fries in Nova Acta Regiae Societatis Scientiarum Upsaliensis , number 14, page 193.

One can distinguish the following subspecies:

  • Hieracium robustum subsp. pallonianum (tooth) tooth : It occurs on the Crimean peninsula and the European part of Russia.
  • Hieracium robustum Fr. subsp. robustum
  • Hieracium robustum subsp. syrmiense (sword & tooth) Gottschl. : It occurs in Southeast Europe.

In the past, another subspecies, Hieracium robustum subsp. largum , which today is equated with Hieracium umbellatum .

swell

  • Zhu Shi, Günter Gottschlich: Asteraceae . Hieracium. In: Wu Zheng-Yi, Peter H. Raven (Ed.): Flora of China . Asteraceae. Volume 20-21. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2011, Hieracium robustum , p. 351 (English, " Hieracium robustum - Online " - this work is online with the same text). (Sections Description, Occurrence and Systematics)

Individual evidence

  1. ↑ a b c d e f g Zhu Shi, Günter Gottschlich: Asteraceae . Hieracium. In: Wu Zheng-Yi, Peter H. Raven (Ed.): Flora of China . Asteraceae. Volume 20-21. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2011, Hieracium robustum , p. 351 (English, Hieracium robustum Fries - online - this work is online with the same text). (Sections Description, Occurrence and Systematics)
  2. ↑ Hieracium robustum at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
  3. ↑ a b c d e Hieracium robustum Fr. In: The Euro + Med PlantBase Project. www.bgbm.org, accessed on August 13, 2017 (English).
  4. ↑ Hieracium robustum at Tropicos.org. Missouri Botanical Garden, St. Louis, Retrieved August 13, 2017.
  5. ↑ Alexander N. Sennikov: The identity of Hieracium largum (Asteraceae) . In: Annales Botanici Fennici . tape 46 , no. 3 . Finnish Zoological and Botanical Publishing Board, 2009, ISSN  1797-2442 , p. 244-246 .

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