Overview

Distribution

National Distribution

Canada

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

United States

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Plants 9–20(–35+) cm. Stems proximally piloso-hirsute (hairs 1–2+ mm), sometimes stipitate-glandular as well, distally stellate-pubescent and stipitate-glandular (not piloso-hirsute). Leaves: basal 5–8+, cauline 0(–2+); blades spatulate to oblanceolate, 15–40 × 5–12 mm, lengths 3–6+ times widths, bases cuneate, margins entire, apices rounded to acute, abaxial faces glabrous or piloso-hirsute (hairs 1–3+ mm), adaxial glabrous or piloso-hispid (hairs 1–3+ mm), sometimes stellate-pubescent as well. Heads usually 2–5+ in ± umbelliform arrays, sometimes borne singly. Peduncles stellate-pubescent and stipitate-glandular (not piloso-hirsute). Calyculi: bractlets 9–13+. Involucres hemispheric, 6–8 mm. Phyllaries 16–21+, apices acuminate, abaxial faces stellate-pubescent and stipitate-glandular, sometimes piloso-hirsute (hairs 0.8–1.5+) as well. Florets 40–60+; corollas yellow, 8+ mm. Cypselae columnar, 1–2.5 mm; pappi of 25–40, white bristles in 1 series, 4–5 mm.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Hieracium lactucella

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Hieracium lactucella

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 1
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: NNA - Not Applicable

United States

Rounded National Status Rank: NNA - Not Applicable

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NatureServe Conservation Status

Rounded Global Status Rank: GNR - Not Yet Ranked

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Wikipedia

Hieracium lactucella

Hieracium amplexicaule (also called European hawkweed[2]) is a species of perennial plant from Asteraceae family that can be found in Europe, New York (United States) and Nova Scotia (Canada).[2] The plant is 9–20 centimetres (3.5–7.9 in), with the stems that could range from 1–2 millimetres (0.039–0.079 in) wide. The leaves are spatula shaped and are 5–8 centimetres (2.0–3.1 in) wide. The flowers bloom from May to July, the heads of which are 2–5 centimetres (0.79–2.0 in) tall. It was once considered to be a Hieracium auricula and Pilosella auricula both of which were described by Carl Linnaeus, but were recategorized by A. E. Roland and M. Zinck in 1998.[3]

References [edit]

  1. ^ "Hawkweed Hieracium lactucella Wallr.". Biolib.cz. Retrieved October 6, 2012. 
  2. ^ a b "Hieracium lactucella Wallr. European hawkweed". USDA. PLANTS Profile. Retrieved October 6, 2012. 
  3. ^ "Hieracium lactucella Wallroth, Sched. Crit. 408. 1822.". Flora of North America. Retrieved October 6, 2012. 
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Notes

Comments

According to A. E. Roland and M. Zinck (1998), Hieracium auricula Linnaeus and Pilosella auricula (Linnaeus) Schultz-Bipontinus have been misapplied to plants here called H. lactucella (see also discussion at 5. H. caespitosum).
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Names and Taxonomy

Taxonomy

Comments: Hieracium lactucella is excluded from Kartesz (1999), however, the revised Flora of Nova Scotia (Zinck 1998) lists it as a "recent introduction to NA, present in NS and NY" (Sean Blaney pers. comm. Sept. 2000).

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