Hieracium albiflorum
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Flower head of Hieracium albiflorum |
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| Hieracium albiflorum | ||||||||||||
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Hieracium albiflorum is a kind from the family of the daisy family (Asteraceae). It is native to North America.
description
Hieracium albiflorum is an herbaceous plant that reaches heights of 15 to 90 centimeters. The upright stems are usually fine and coarse with 1 to 6 millimeter long hairs, more rarely also bald. The base of the stem is bare.
At the base of the stem there are three to eight, occasionally more or no basal leaves , while one to twelve leaves branch off from the stem. The leaf blade is formed upside-lanceolate at a length of 4 to 30 centimeters and a width from 1.2 to 6 centimeters. The base of the spreader is wedge-shaped while the tip of the spreader tapers to a point and the edges of the spreader are usually whole, but occasionally also toothed. Both the top and the bottom of the leaves are covered with fine, rough hairs 1 to 6 millimeters long, but they can also be bald.
The flowering period extends from May to September. The total inflorescences consist of three to fifty schirmrispen- or ripsenartig arranged, cup-shaped part inflorescences. The inflorescence shaft is usually hairless, but occasionally also covered with glandular hair. The more or less bell-shaped involucre contains 8 to 18 hairy bracts on the underside , which are 7 to 11 millimeters long. The flower heads contain 6 to 25 yellow ray-florets , which are 9 to 10 millimeters long. The achenes are columnar with a length of 2.5 to 4 millimeters. They have a papus , which is composed of 30 to 40 straw-colored bristle hairs.
The number of chromosomes is 2n = 18.
Occurrence
The natural range of Hieracium albiflorum is in North America. It stretches from Alaska across Canada and the central and western parts of the United States to northwestern Mexico.
Hieracium albiflorum thrives at altitudes of 10 to 2900 meters. The species grows in the chaparral on pastures and slopes, along rivers and at mineral springs , in pine forests and on volcanic slopes.
Systematics
It was first described as Hieracium albiflorum in 1833 by William Jackson Hooker in Flora Boreali-Americana , Volume 1, Number 6, Page 298. Synonyms for Hieracium albiflorum Hook. are among others Chlorocrepis albiflora (Hook.) WA Weber and Pilosella albiflora (Hook.) FW Schultz & Sch. Gdp.
swell
- John L. Strother: Asteraceae . Hieracium . In: Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico . Pteridophytes and Gymnosperms. Volume 19, 20 & 21. Oxford University Press, New York a. a. 2006, ISBN 0-19-530563-9 , Hieracium (English, Hieracium albiflorum - online - this work is online with the same text.).
Individual evidence
- ↑ a b c d e John L. Strother: Asteraceae . Hieracium . In: Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico . Pteridophytes and Gymnosperms. Volume 19, 20 & 21. Oxford University Press, New York a. a. 2006, ISBN 0-19-530563-9 , Hieracium (English, Hieracium albiflorum - online - this work is online with the same text.).
- ↑ Hieracium albiflorum at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ Hieracium albiflorum. In: The International Plant Names Index. www.ipni.org, accessed on September 28, 2016 (English).
- ↑ Hieracium albiflorum at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed September 28, 2016.
