Goldenweed (3)
The Goldenweeds in the genus Xanthisma have bristle-tipped leaves and phyllaries, and bright yellow flowers. As you can see from their many synonyms they have been reclassified many times. Xanthisma is the current name from Flora of North America.
Spiny Goldenweed
Xanthisma spinulosum var. paradoxum
(Haplopappus spinulosus, Machaeranthera pinnatifida)
Family:
Sunflower (Asteraceae)
AKA:
Lacy Tansyaster, Cut-leaf Ironplant
Photo taken on:
May 14, 2009
Location:
White Rock, NM
Life Zones:
Plains and foothills
Habitat:
Dry areas, roadsides
Grows 1 to 2 feet with stems branched and spreading from the base. Leaves are sparse, greyish, deeply cut and narrow. Soft hairs give a silvery appearance. Flowers are borne singly at the top of a stem.
Flora of North America reference.
Spiny Goldenweed
Xanthisma spinulosum var. spinulosum
(Haplopappus spinulosus, Machaeranthera pinnatifida)
Family:
Sunflower (Asteraceae)
AKA:
Photo taken on:
September 12, 2014
Location:
Wet Mountains, Eastern CO
Life Zones:
Plains and foothills
Habitat:
Dry rocky areas, roadsides
Grows with stems spreading and sprawling to 16". Leaves are numerous, also deeply cut but wider than the variety above. Flowers grow in clusters.
It was snowing when I took this photo so the flowers are not very happy, although still a bright yellow.
Flora of North America reference.
Slender Goldenweed
Xanthisma gracile
(Haplopappus gracilis, Machaeranthera gracilis, Dieteria gracilis)
Family:
Sunflower (Asteraceae)
AKA:
Annual Bristleweed, Slender Sleep-daisy
Photo taken on:
October 27, 2011
Location:
White Rock, NM
Life Zones:
Foothills and montane
Habitat:
Dry areas, roadsides
Grows to 15" with a single flower at the top of the stem. The narrow leaves are oblong and toothed with a bristle at the end of each tooth. It is not hairy like Spiny Goldenweed.
Flora of North America reference.