Grindelia havardii explained

Grindelia havardii, or Havard's gumweed, is a North American species of flowering plants in the family Asteraceae. It is native to the south-central United States, in the states of Texas and New Mexico.^{[1] [2]}

Grindelia havardii grows in open, sunny sites on rocky slopes and in alluvial deposits. It is a perennial herb sometimes as much as 150 cm (5 feet) tall. The plant usually produces numerous flower heads in crowded, flat-topped arrays. Each head has 18-25 ray flowers, surrounding a large number of tiny disc flowers.^{[3] [4]}

External links

• photo of herbarium specimen at Missouri Botanical Garden, collected in Texas in 1931, isotype of Grindelia havardii

Notes and References

1. http://bonap.net/MapGallery/County/Grindelia%20havardii.png Biota of North America Program 2014 county distribution map
2. https://www.biodiversitylibrary.org/page/13062647#page/72/mode/1up Nesom, G.L. 1990. Studies in the systematics of Mexican and Texan Grindelia (Asteraceae: Astereae. Phytologia 68(4): 303–332
3. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066811 Flora of North America, Grindelia havardii Steyermark, 1934
4. https://www.biodiversitylibrary.org/page/15994756#page/486/mode/1up Steyermark, Julian Alfred. 1934. Annals of the Missouri Botanical Garden 21(3): 474–476