Hieracium venosum

{{Short description|Species of flowering plant}}

{{Speciesbox

| image = Hieracium-venosum03.jpg

| image_caption = 1913 illustrationBritton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 332.

| genus = Hieracium

| species = venosum

| authority = L. 1753

| synonyms_ref = [http://www.theplantlist.org/tpl1.1/record/gcc-142941 The Plant List, Hieracium venosum L. ]

| synonyms =

• Hieracium gronovii var. nudicaule Michx.
• Hieracium venosum var. nudicaule (Michx.) Farw.

}}

Hieracium venosum (Robin's plantain, rattlesnakeweed, or rattlesnake hawkweed) is a species of hawkweed in the tribe Cichorieae within the family Asteraceae. It is widespread and common in south-central Canada (Ontario) and the eastern United States (from Michigan east to Maine and south as far as Florida and Mississippi).

{{cite web

|url=http://plants.usda.gov/plant-profile?symbol=HIVE

|title=Hieracium venosum L., Rattlesnakeweed

|author=United States Department of Agriculture, Natural Resources Conservation Service

|authorlink=Natural Resources Conservation Service}}

{{cite web

|url=http://uswildflowers.com/detail.php?SName=Hieracium%20venosum

|title=Rattlesnake Weed, Rattlesnake Hawkweed, Veiny Hawkweed - Hieracium venosum

|author=Wildflowers of the United States, Gerry Williamson

|authorlink=Natural Resources Conservation Service}}

[http://bonap.net/MapGallery/County/Hieracium%20venosum.png Biota of North America Program 2014 county distribution map] Its common name comes from the fact that environments it is found in are typically also a home to rattlesnakes.{{cite web |url=https://www.wildflower.org/plants/result.php?id_plant=HIVE |title=Hieracium venosum (Rattlesnakeweed) |date=3 August 2017 |website=Lady Bird Johnson Wildflower Center |accessdate=14 August 2019}}

Hieracium venosum is a hairy herb up to 45 cm (18 inches) tall, with most of the leaves crowded around the base of the stem. One plant can produce as many as 20 flower heads, each with 30–45 yellow ray flowers but no disc flowers.[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066960 Flora of North America, Hieracium venosum Linnaeus, 1753.] It is a perennial that blooms from May to September, and prefers shady conditions with dry, sandy soil.

{{Gallery

|File:Hieracium venosum rattlesnake weed plant.jpg|Hieracium venosum flowering, with leaves crowded around the base.

|File:Hieracium venosum leaves.jpg|Leaves detail.

|File:Hieracium venosum flowers buds.jpg|Flower detail.

|File:Hieracium venosum - Rattlesnake weed 2.jpg|6 yellow ray flowers.

}}