Hieracium nudicaule
| Hieracium nudicaule | ||||||||||||
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| Hieracium nudicaule | ||||||||||||
| ( A.Gray ) A.Heller |
Hieracium nudicaule is a plant from the genus of hawkweed ( Hieracium ) within the family of Compositae (Asteraceae). It occurs only in the western US states of California and Oregon .
description
Vegetative characteristics
Hieracium nudicaule is a perennial herbaceous plant that reaches heights of 15 to 50 centimeters, sometimes even more. The stems are mostly bald, but occasionally with star-shaped or with fine and rough 0.1 to 0.7 cm long hairs and have a mostly hairless, sometimes rough or star-shaped hairy base.
There are three to eight basal leaves at the base of the stem , while there are no or up to five leaves on the stem. The leaf blade is at a length of 5-12 centimeters and a width from 0.6 to 3 centimeters lanceolate to lanceolate-elliptical with a wedge-shaped Spreitenbasis and acute Spreitenspitze. The spreading margins are mostly whole, but occasionally jagged. Both the underside and the upper side of the leaf are covered with star-shaped as well as fine and rough 0.2 to 0.7 cm long hairs, but sometimes the surfaces are also bare.
Generative characteristics
The flowering period extends from June to August and sometimes even into September. The paniculate to umbrella-clustered or almost doldy total inflorescence usually contains two to twelve or more cup-shaped partial inflorescences. The inflorescence stem is more or less covered with star-like and occasionally with glandular and stalked hair. With a length of 0.8 to 1 centimeters and a diameter of 0.4 to 0.6 centimeters, the more or less bell-shaped involucre contains 8 to 13, sometimes more on the underside glandular and star-like hairy bracts with rounded to pointed tips. The flower heads contain 20 to 40 or more ray florets. The yellow ray florets are 0.8 to 1 centimeter long.
The black achenes are columnar with a length of 0.25 to 0.3 centimeters. The pappus consists of 40 to 60 or more white or straw-colored bristle hairs, which are 0.4 to 0.6 inches long.
Occurrence
Hieracium nudicaule is found in the western part of the United States only in the states of California and Oregon .
Hieracium nudicaule thrives at altitudes of 400 to 2300 meters in open locations in the chaparral and in clearings in coniferous forests.
Taxonomy
The first description as Hieracium cynoglossoides var. Nudicaule was in 1883 by Asa Gray in Proceedings of the American Academy of Arts and Sciences , Volume 19, page 68. Amos Arthur Heller raised in 1906 in Muhlenbergia; a journal of botany , number 2, page 149 this variety as Hieracium nudicaule in the rank of an independent species . Another synonym for Hieracium nudicuale (A.Gray) A.Heller is Hieracium scouleri var. Nudicaule (A.Gray) Cronquist .
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 nudicaule - online - this work is online with the same text.). (Sections Description, Occurrence and Systematics)
Individual evidence
- ↑ a b c d e f g 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 nudicaule - online - this work is online with the same text.).
- ↑ Hieracium nudicaule at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed January 1, 2018.