Hieracium procerum
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Hieracium procerum is a plant from the genus of hawkweed ( Hieracium ) within the family of Compositae (Asteraceae). It iswidespreadfrom southwest to central Asia.
description
Vegetative characteristics
Hieracium procerum is a perennial herbaceous plant that reaches heights of 20 to 60 centimeters. It forms rhizomes .
The upright stems are branched in the upper part and stand together individually or in small numbers in clusters. They are densely covered with light brown bristle hairs at the base. The bristle hairs appear sparsely in the upper part of the stem and are replaced by star-shaped hairs. Under the flower heads, the stems are densely hairy white or yellowish downy ( indument ).
At the base of the stem there are several basal leaves which fall before the flowering period, while there are several sessile leaves on the stem. The leaf blade is approximately elliptical with a length of 3 to 10 cm and a width of 0.2 to 1.2 centimeters to lanceolate with tapered Spreitenspitze. Both the underside and the upper side of the leaf are densely covered with light brown bristle hairs and small star-shaped hairs.
Generative characteristics
At least in Xinjiang, the flowering period and fruit ripening extend from July to August. The umbrella-like total inflorescence contains numerous cup-shaped partial inflorescences. The semi-spherical with a diameter of 0.9 to 1.1 centimeters involucre containing three or four rows of hairy at the bottom bracts . The outer bracts are lanceolate with a length of 3 to 4 millimeters, while the inner bracts are elliptical-lanceolate with a length of 7 to 9 millimeters. The flower heads contain several yellow ray-florets .
The dark brown achenes are cylindrical with a length of about 0.22 centimeters and have ten ribs. The pappus consists of several dirty white bristle hairs, which are about 0.7 centimeters long.
Chromosome number
The number of chromosomes is 2n = 36.
Occurrence and endangerment
The natural range of Hieracium procerum includes parts of southwest and central Asia . It extends from the Middle East through Uzbekistan and Kazakhstan to the Uyghur Autonomous Region of Xinjiang .
Hieracium procerum thrives in Xinjiang on dry mountain slopes at altitudes of 1200 to 2500 meters.
Taxonomy
It was first described as Hieracium procerum in 1848 by Elias Magnus Fries in Symbolae ad Historiam Hieraciorum , page 43. Synonyms for Hieracium procerum Fr. are Hieracium caucasicum Nägeli & Peter , Hieracium echioides subsp. procerum P.D.Sell , Hieracium macrochaetium Üksip , Hieracium persicum Boiss. , Hieracium phrygicum Üksip , Hieracium proceriforme tooth , Pilosella echioides subsp. procera P.D.Sell & C.West , Pilosella procera (Fr.) FW Schultz & Sch. Gdp. and Pilosella proceriformis (Nägeli & Peter) Soják .
swell
- Zhu Shi, Günter Gottschlich: Asteraceae . Pilosella. 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, ISBN 978-1-935641-07-0 , Pilosella procera (Fries) FW Schultz & Schultz Bipontinus , p. 353 (English, " Pilosella procera - Online " - this work is online with the same text). (Sections Description, Occurrence and Systematics)
Individual evidence
- ↑ a b c d e f g h Zhu Shi, Günter Gottschlich: Asteraceae . Pilosella. 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, ISBN 978-1-935641-07-0 , Pilosella procera (Fries) FW Schultz & Schultz Bipontinus , p. 353 (English, " Pilosella procera - Online " - this work is online with the same text). (Sections Description, Occurrence and Systematics)
- ↑ Pilosella procera at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed October 4, 2017.