Hieracium sinoaestivum
| Hieracium sinoaestivum | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Holotype of Hieracium sinoaestivum |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Hieracium sinoaestivum | ||||||||||||
| Sennikov |
Hieracium sinoaestivum is a plant from the genus of hawkweed ( Hieracium ) within the family of Compositae (Asteraceae). It was first described in 2014. This endemic occurs only in the Shanxi province in northern China.
description
Vegetative characteristics
Hieracium sinoaestivum is a perennial herbaceous plant that reaches heights of 60 to 70 centimeters. The sturdy stems are pale green. They are either bald or hairy with numerous simple trichomes up to 3 millimeters long . There are also some star-shaped trichomes, especially in the lower part of the stem.
There are up to 50 sessile leaves on each stem . The leaf blade is intensely green on the upper side and pale green on the underside and covered with star-shaped trichomes on both sides. Along the leaf margins and on the underside, they also have 1.5 to 2 millimeters long hairs with simple trichomes. Nothing is known about the basal leaves as they wilted before the flowering period and were missing on all plant specimens collected so far. The stem leaves in the central stem area have a leaf blade which is 9 to 12 centimeters long and 2.5 to 4 centimeters wide and is elongated-egg-shaped, with a broad wedge-shaped or rounded blade base and a pointed upper end. Your leaf margins are serrated and have four to five pairs of pointed teeth, which are 0.5 to 0.8 inches long. The leaves in the upper stem area have a leaf blade which is ovate-lanceolate with a length of up to 6 centimeters and a width of 1.5 to 1.8 centimeters, with a rounded blade base and a pointed upper end. Their leaf margins are serrated and have three to four pairs of small and narrow teeth.
Generative characteristics
The flowering period includes August, while the fruits ripen from August to September. Hieracium sinoaestivum presumably reproduces apomictically .
The total inflorescences are up to 25 centimeters long, have three to eight branches and contain 10 to 35 cup-shaped partial inflorescences. The elongated inflorescence stem is densely downy covered with star-shaped hairs under the partial inflorescences. The cup-shaped flower heads have a rounded base. The involucre contains several olive-green colored bracts , which are elongated-triangular with a tapering upper end with a length of 9 to 10 millimeters and a width of 1 to 1.7 millimeters. They are a little lighter colored at the edges and covered with star-shaped and simple glandular hairs, which are darker at the base, but otherwise whitish in color. Each flower head contains 15 to 18 tubular flowers , which are 1.6 to 1.7 centimeters long. The ray- florets, which are bare at the tip, are probably intensely yellow in color. The stylus has black spines.
The brick-red achenes are about 4 millimeters long. The pappus consists of several yellowish bristle hairs, which are 0.7 to 0.8 centimeters long.
Occurrence
Hieracium sinoaestivum has so far only been found at one location in Lüliang Shan in the Chinese province of Shanxi .
Hieracium sinoaestivum thrives on mountain pastures at altitudes of 600 to 750 meters.
Systematics
The first description as Hieracium sinoaestivum was made in 2014 by Alexander N. Sennikov in PhytoKeys , number 39, page 21. While working on a revision of the genus Hieracium in the Naturhistoriska riksmuseet, Sennikov discovered two herbarium specimens which Karl Johansson (1856–1928) already identified as a new species Hieracium chinense , but did not publish this first description before his death. Sennikov published the first description of this species as Hieracium sinoaestivum because the name Hieracium chinense proposed by Johansson could lead to confusion with Hieracium sinense . The epithet sinoaestivum consists of Sino- for Chinese and aestivum for the section in which the new species was found together.
According to the first description, Hieracium sinoaestivum belongs to the Aestiva section within the genus Hieracium .
swell
- Alexander N. Sennikov: Hieracium sinoaestivum (Asteraceae), a new species from North China . In: PhytoKeys . No. 39 , 2014, ISSN 1314-2003 , p. 19-26 , doi : 10.3897 / phytokeys.39.7788 .
Individual evidence
- ↑ a b c d e f g h i Alexander N. Sennikov: Hieracium sinoaestivum (Asteraceae), a new species from North China . In: PhytoKeys . No. 39 , 2014, ISSN 1314-2003 , p. 19-26 , doi : 10.3897 / phytokeys.39.7788 .
