long-bearded hawkweed

(Hieracium longipilum)

               
Conservation Status

IUCN Red List

not yet assessed

long-bearded hawkweed

NatureServe

NNR - Unranked

SNR - Unranked

Minnesota

Watch list
Nativity

Native

Occurrence

 

Habitat

Dry. Prairies, fields, open woods, roadsides. Sandy soils.

Flowering

July to August

     
Flower Color

Yellow

     
Height

24 to 60

     

Identification

This is a 24 to 6 tall, erect, perennial forb that rises usually on a solitary stem from a woody, branched, ascending rootstock. The most striking feature of this plant are the long hairs on the stem and leaves.

The stems are erect or strongly ascending, stout, finely ridged, and unbranched below the inflorescence. They are hairy with up to three types of hairs. The base of the stem is densely covered with ¼ to long, white to light orangish-brown, spreading to loosely ascending hairs. These hairs become shorter and sparser as they ascend the stem, the hairs on the upper stem to long. The stems are usually also covered with minute, soft, star-shaped hairs. Finally, the stems are often sparsely covered with gland-tipped hairs toward the top.

There are usually 3 to 8 or more basal leaves and 6 to 12 stem leaves.

Basal leaves are inversely lance-shaped, short-stalked, unlobed, wedge-shaped at the base, and rounded to sharply pointed at the tip. They can be 1¾ to 10 or more long and ½ to 19 16 wide, though they are usually no more than 3 long and 13 16 wide. They are 4 to 7 or more times as long as wide. The upper and lower surfaces are densely covered with to 5 16 long or longer, more or less spreading hairs. The margins are untoothed and have a fringe of long, straight hairs. Basal leaves are often present at flowering time.

Stem leaves are similar to basal leaves but are mostly stalkless and are gradually reduced in size as they ascend the stem. The base of the leaf does not clasp the stem. Stem leaves are mostly confined to the lower half of the stem, and are often crowded near the base. If there are leaves on the upper half of the stem, they will be small and bract-like.

The inflorescence is a cylinder-shaped, branched cluster (panicle) of 10 to 20 or more flower heads at the end of the stem. Sometimes the inflorescence is unbranched and spike-like. The flower heads are on short stalks that have minute, star-shaped hairs, glandular hairs, and sometimes also long straight hairs.

The flower heads are ½ to ¾ wide. The whorl of bracts at the base of the flower head (involucre) is bell-shaped and ¼ to long. The bracts of the involucre are covered with minute, star-shaped hairs and longer, dark-colored, gland-tipped hairs. Each flower head has 30 to 60, though usually no more than 40, yellow ray florets and no disk florets.

The fruit is a to 3 16 long, urn-shaped achene with 35 to 40 or more straw-colored to orangish-brown bristles attached to the end.

 
Similar
Species

The long hairs on the stem and leaves distinguish this plant from all other hawkweeds found in Minnesota.


Distribution Range Map   Sources: 2, 3, 4, 5, 7, 28.

Comments

 


Taxonomy

Family:

Asteraceae (aster)

 

Subfamily:

Cichorioideae

 

Tribe:

Cichorieae (lettuce)

 

Subtribe:

Hieraciinae

 
Synonyms

 

 
Common
Names

hairy hawkweed

long-beard hawkweed

long-bearded hawkweed

long-haired hawkweed

longbeard hawkweed

longleaf sagebrush

longleaf wormwood

prairie hawkweed

Locations

Spring Creek Prairie

South-facing bluff, in bluff prairie.

On thin loess-derived silt loam

 

 


 

 

 

 

 

 

 

 

Glossary

 

achene

A dry, one-chambered, single-seeded fruit, formed from a single carpel, with the seed attached to the membranous outer layer (wall) only by the seed stalk; the wall, formed entirely from the wall of the superior ovary, does not split open at maturity, but relies on decay or predation to release the contents.

 

bract

Modified leaf at the base of a flower stalk or flower cluster.

 

clasping

Describing a leaf that wholly or partly surrounds the stem but does not fuse at the base.

 

glandular hairs

Hairs spread over aerial vegetation that secrete essential oils. The oils act to protect against herbivores and pathogens or, when on a flower part, attract pollinators. The hairs have a sticky or oily feel.

 

involucre

A whorl of bracts beneath or surrounding a flower or flower cluster.

       

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Plant

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Inflorescence

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Stem Leaves

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Basal Leaves

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Stem

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Infructescence

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MinnesotaSeasons.com Sightings

   

Bunker Hills Regional Park

Crow-Hassan Park Reserve

Helen Allison Savanna SNA

Kellogg-Weaver Dunes SNA
Kellogg-Weaver Unit

 

Wild River State Park


 

 

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