Hieracium robinsonii — Robinson's hawkweed
![Flowers: Hieracium robinsonii. ~ By Louis-M. Landry. ~ Copyright © 2024 Louis-M. Landry. ~ LM.Landry[at]videotron.ca ~ CalPhotos - calphotos.berkeley.edu/flora/](https://newfs.s3.amazonaws.com/taxon-images-1000s1000/Asteraceae/hieracium-robinsonii-fl-llandry-a.jpg)
![Plant form: Hieracium robinsonii. ~ By Arthur Haines. ~ Copyright © 2024 Arthur Haines. ~ arthur.d.haines[at]gmail.com](https://newfs.s3.amazonaws.com/taxon-images-1000s1000/Asteraceae/hieracium-robinsonii-ha-ahaines-e.jpg)
![Leaves: Hieracium robinsonii. ~ By Arthur Haines. ~ Copyright © 2024 Arthur Haines. ~ arthur.d.haines[at]gmail.com](https://newfs.s3.amazonaws.com/taxon-images-1000s1000/Asteraceae/hieracium-robinsonii-le-ahaines-c.jpg)
![Fruits: Hieracium robinsonii. ~ By Arthur Haines. ~ Copyright © 2024 Arthur Haines. ~ arthur.d.haines[at]gmail.com](https://newfs.s3.amazonaws.com/taxon-images-1000s1000/Asteraceae/hieracium-robinsonii-fr-ahaines-d.jpg)
![Plant form: Hieracium robinsonii. ~ By Arthur Haines. ~ Copyright © 2024 Arthur Haines. ~ arthur.d.haines[at]gmail.com](https://newfs.s3.amazonaws.com/taxon-images-1000s1000/Asteraceae/hieracium-robinsonii-ha-ahaines-b.jpg)
![Fruits: Hieracium robinsonii. ~ By Arthur Haines. ~ Copyright © 2024 Arthur Haines. ~ arthur.d.haines[at]gmail.com](https://newfs.s3.amazonaws.com/taxon-images-1000s1000/Asteraceae/hieracium-robinsonii-fr-ahaines-a.jpg)
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Facts
Robinson's hawkweed is a globally imperiled species, reduced to a single population in northern New Hampshire and a handful in northeastern Canada, although it could be rediscovered in northern Maine. It is confined to open ledges and cliffs along rivers, usually on high-pH bedrock.
Habitat
Shores of rivers or lakes
New England distribution
Adapted from BONAP data
Native: indigenous.
Non-native: introduced (intentionally or unintentionally); has become naturalized.
County documented: documented to exist in the county by evidence (herbarium specimen, photograph). Also covers those considered historical (not seen in 20 years).
State documented: documented to exist in the state, but not documented to a county within the state. Also covers those considered historical (not seen in 20 years).
Note: when native and non-native populations both exist in a county, only native status is shown on the map.
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enlargeCharacteristics
- Habitat
- terrestrial
- New England state
-
- Maine
- New Hampshire
- Leaf type
- leaves are simple (lobed or unlobed but not separated into leaflets)
- Leaf arrangement
- alternate: there is one leaf per node along the stem
- Leaf blade edges
- the edge of the leaf blade has teeth
- Flower type in flower heads
- the flower head has ray flowers only, meaning all of the individual flowers of the flower head have a strap-shaped ray, which may or may not have teeth at the very tip of the ray
- Ray flower color
- yellow
- Tuft or plume on fruit
- at least a part of the plume is made up of fine bristles
- Spines on plant
- the plant has no spines
- Leaf blade length
- 20–80 mm
- Disk flower number
- 0
-
Flowers
- Bract cycle number
- there are two main cycles of bracts
- Bract outer side hair type
- the bracts are hairy on their outer surfaces, with hairs having glands (a swelling at the tip of the hair)
- Bract outer side hairs
- the bracts are hairy on their outer surfaces
- Bract tip shape
-
- the tips of the bracts acute (have a sharp point)
- the tips of the bracts are acuminate (tapered to a narrow point)
- Disk flower number
- 0
- Disk flower proportions
- NA
- Disk flower reproductive parts
- NA
- Disk flower shape
- NA
- Flower head number
-
- each flowering stem has four or more flower heads on it
- each flowering stem has only one to three flower heads on it
- Flower head outer flowers
- at the outer edge of the flower head, each flower has a single enlarged lobe or strap
- Flower head platform
- the base has no bristles or papery scales
- Flower head profile
- the disk is flat or nearly flat across the top
- Flower type in flower heads
- the flower head has ray flowers only, meaning all of the individual flowers of the flower head have a strap-shaped ray, which may or may not have teeth at the very tip of the ray
- Height of flower head base
- 10–15 mm
- Inflorescence shape
- the inflorescence is flat-topped in profile
- Ovary cross-section
- the ovary has five or more corners in cross-section
- Ovary hair type
- the ovary has no hairs on it
- Ovary hairs
- the ovary has no hairs on it
- Ovary profile
- in profile, the ovary is another shape
- Ray flower color
- yellow
- Ray flower reproductive parts
- the ray flowers have both carpels and stamens
- Ray flowers
- 26-50
- Reproductive system
- NA
-
Fruits or seeds
- Ovary length in developed fruit
- 3–5 mm
- Seed hair tuft color
-
- the pappus hairs are tan to dark brown
- the pappus hairs are white or off-white
- Seed hair tuft details
- the pappus hairs are hooked or barbed
- Seed hair tuft length
- 4.5–7 mm
- Tuft or plume on fruit
- at least a part of the plume is made up of fine bristles
-
Growth form
- Growth form
- the plant has one or more free-standing stems
- Horizontal rooting stem
- there are no stolons
- Plant lifespan
- the plant is perennial, it shows evidence of previous year's leaves, stems or stem bases
- Spines on plant
- the plant has no spines
- Underground organs
- there is a thickened taproot on the plant
-
Leaves
- Hairs on underside of leaf blade
- the underside of the leaf is fuzzy or hairy
- Leaf arrangement
- alternate: there is one leaf per node along the stem
- Leaf blade base
- the leaf has a distinct petiole
- Leaf blade base shape
- the base of the leaf blade is cuneate (wedge-shaped, tapers to the base with relatively straight, converging edges), or narrow
- Leaf blade edges
- the edge of the leaf blade has teeth
- Leaf blade length
- 20–80 mm
- Leaf blade shape
-
- the leaf blade is lanceolate (lance-shaped; widest below the middle and tapering at both ends)
- the leaf blade is oblong (rectangular but with rounded ends)
- Leaf blade tip
-
- the tip of the leaf blade is acuminate (tapers to a long, thin point)
- the tip of the leaf blade is acute (sharply pointed)
- Leaf blade width
- 7–20 mm
- Leaf disposition
- the leaves are nearly similar in size, prominence of teeth, and length of stalks throughout the stem
- Leaf spines
- there are no spines on the leaf edges
- Leaf type
- leaves are simple (lobed or unlobed but not separated into leaflets)
- Specific leaf type
- the leaves are simple (lobed or unlobed but not separated into leaflets
-
Place
- Habitat
- terrestrial
- New England state
-
- Maine
- New Hampshire
- Specific habitat
- shores of rivers or lakes
-
Stem, shoot, branch
- Leaves on stem
- there is at least one full leaf above the base of the flowering stem
- Stem internode hair direction
- the hairs point mostly upwards to outwards
- Stem internode hair type
- at least some of the hairs on the stem have glands
- Stem internode hairs
- the stem has hairs between the nodes
Wetland status
Not classified
In New England
Distribution
- Connecticut
- absent
- Maine
- present
- Massachusetts
- absent
- New Hampshire
- present
- Rhode Island
- absent
- Vermont
- absent
Conservation status
Exact status definitions can vary from state to state. For details, please check with your state.
- Maine
- extremely rare (S-rank: S1), endangered (code: E)
- New Hampshire
- extremely rare (S-rank: S1), endangered (code: E)
From Flora Novae Angliae dichotomous key
13. Hieracium robinsonii (Zahn) Fern. NC
Robinson’s hawkweed. Hieracium ungavense Lepage • ME, NH; northern portion of states. River shore outcrops, usually of high pH.