Hymenoxys species

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Scientific Name Hymenoxys grandiflora (Tetraneuris grandiflora, Rydbergia grandiflora) USDA PLANTS Symbol HYGR5
Common Name Old-man-of-the-mountain, Alpine Sunflower ITIS Taxonomic Serial No. 514996
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Subalpine and alpine (10000 to 14000 ft); meadows, often above timberline, tundra.
Plant: Short erect perennial 4 to 12 inches tall; 1 to 10 stout, grayish, woolly stems.
Leaves: Mostly basal to 4 inches long divided into narrow, somewhat hairy lobes.
Inflorescence: Nodding, conspicuous composite flower heads 4 inches across with notched yellow rays; large, domed disk with hundreds of florets; narrow, woolly phyllaries beneath.
Bloom Period: June to August.
References: "Guide to Colorado Wildflowers" by G.K. Guennel, "Flora of Colorado" by Jennifer Ackerfield and SEINet.
BONAP Distribution Map
Colorado Status:
Native
Scientific Name Hymenoxys hoopesii USDA PLANTS Symbol HYHO
Common Name Orange Sneezeweed, Owl's-claws ITIS Taxonomic Serial No. 507616
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Foothills to subalpine (7000 to 11500); moist areas in open woods, meadows, roadsides.
Plant: Erect perennial 12 to 40 inches tall; stout, leafy stem, often purple-red-tinted.
Leaves: Stem leaves to 12 inches long, alternate, thick, oblanceolate, somewhat hairy to smooth; upper leaves smaller.
Inflorescence: Composite flower heads 3 inches across with drooping yellow to orange rays, teeth on tips; orange-yellow domed disk with hundreds of florets; hairy phyllaries beneath.
Bloom Period: June to August.
References: "Guide to Colorado Wildflowers" by G.K. Guennel, "Flora of Colorado" by Jennifer Ackerfield, and SEINet.
BONAP Distribution Map
Colorado Status:
Native
Scientific Name Hymenoxys richardonsii var. floribunda USDA PLANTS Symbol HYRIF
Common Name Colorado Rubberweed ITIS Taxonomic Serial No. 528536
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Foothills and montane (5700 to 10500 ft); sandy, rocky soils in open areas, roadsides and open forests.
Plant: Erect perennial 8 to 14 inches tall; usually multiple (5 to 20) stems per plant, branched above; smooth to pubescent.
Leaves: Many alternate stem leaves, 3/4 to 6 inches long, narrowly linear and/or cleft into 3 to 5 long, thin lobes; surfaces are smooth to somewhat pubescent and gland-dotted.
Inflorescence: A showy display of many bright yellow flowers; each branch with a few to up to 12 flower heads in panicles; each head up to about one inch across with 7 to 14 rays and many disk florets; involucre with two series of nearly-equal length gland-dotted phyllaries.
Bloom Period: June to September.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and Flora of North America.
BONAP Distribution Map
Colorado Status:
Native
© Tom Lebsack 2021