Hieracium megacephalum
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Hieracium megacephalum , detail of a flower head |
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| Hieracium megacephalum | ||||||||||||
| Nash |
Hieracium megacephalum , occasionally Hieracium mega Cephalon written is a plant from the genus of hawkweed ( Hieracium ) within the family of Compositae (Asteraceae). It occurs in southeastern North America.
description
Vegetative characteristics
Hieracium megacephalum is a perennial herbaceous plant that reaches heights of up to about 40 centimeters. The stems are mostly covered with star-shaped as well as fine and rough 0.1 to 0.4 cm long hair and have a rough and occasionally star-shaped hairy base.
There are four to six basal leaves at the base of the stem , while there are one to four or more leaves on the stem. The leaf blade is at a length from 3.5 to 12 centimeters and a width of 1.5 to 4 centimeters elliptical to obovate with wedge-shaped to rounded and sometimes more or less comprehensive Spreitenbasis stalk and rounded to blunt Spreitenspitze. The spreading margins are whole or serrated. The underside of the leaf is covered with fine and coarse 0.15 to 0.4 centimeter long hairs, sometimes with star-shaped hairs, while the upper side of the leaf is roughly hairy.
Generative characteristics
The main flowering period extends from April to May, while the entire flowering period covers the period between January and October. The open, umbrella-clustered total inflorescence usually contains 12 to 50 or more cup-shaped partial inflorescences and is about twice as long as it is wide. The inflorescence shaft is covered with star-like as well as with glandular and stalked hair. With a diameter of 0.8 to 1.1 centimeters, the bell-shaped involucre contains 9 to 13, occasionally more on the underside, glandular and star-like hairy bracts with pointed to pointed tips. The flower heads contain 20 to 50 or more ray florets. The yellow ray florets are 1 to 1.2 inches long.
The achenes are jug-shaped with a length of 0.35 to 0.4 centimeters. The pappus consists of 32 to 40 or more white or straw-colored bristle hairs, which are 0.5 to 0.65 inches long.
Occurrence
The natural range of Hieracium megacephalum is in southeastern North America. It includes the US states of Florida , Georgia and South Carolina .
Hieracium megacephalum thrives at altitudes of 0 to 10 meters where it grows on sandy areas and in deciduous and pine forests on calcareous soils .
Taxonomy
It was first described as Hieracium megacephalum in 1895 by George Valentine Nash in Bulletin of the Torrey Botanical Club , Volume 22, Pages 152 to 153, at that time still in the spelling megacephalon . A synonym for Hieracium megacephalum Nash is Hieracium argyraeum Small .
swell
- John L. Strother: Asteraceae . Hieracium . In: Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico . Magnoliophyta: Asteridae, part 6: Asteraceae, part 1 (Mutisieae-Anthemideae). Volume 19. Oxford University Press, New York and Oxford 2006, ISBN 0-19-530563-9 , Hieracium (English, Hieracium megacephalon - online - this work is online with the same text.). (Sections Description, Occurrence and Systematics)
Individual evidence
- ↑ a b c d e f John L. Strother: Asteraceae . Hieracium . In: Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico . Magnoliophyta: Asteridae, part 6: Asteraceae, part 1 (Mutisieae-Anthemideae). Volume 19. Oxford University Press, New York and Oxford 2006, ISBN 0-19-530563-9 , Hieracium (English, Hieracium megacephalon - online - this work is online with the same text.).
- ↑ Hieracium megacephalum at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed January 1, 2018.
