Senecio species

 DSC1387

Dwarf Mountain Ragwort (Senecio fremontii var. blitoides) 

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Scientific Name Senecio amplectens var. amplectens USDA PLANTS Symbol SEAMA
Common Name Showy Alpine Ragwort ITIS Taxonomic Serial No. 530298
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Montane to alpine (8500 to 14400 ft.); forest openings, rocky areas, talus slopes.
Plant: Erect perennial 16 to 24 inches tall, stout, hairless stems, single or in clusters.
Leaves: Large basal and stem leaves, lanceolate to oblanceolate, up to 8 inches long, may be purplish-tinged; basal leaves with long petioles, stem leaves without; edges may have irregular teeth.
Inflorescence: Large composite flower heads up to 3 inches across in clusters of 1 to 5 nodding heads. About 13 narrow, yellow rays, darker yellow-to-brown florets in dome-shaped disk; pointed green or more frequently, dark, phyllaries with a few black hairs and maybe dark tips.
Bloom Period: July and August.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and www.americansouthwest.net
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Senecio amplectens var. holmii USDA PLANTS Symbol SEAMH
Common Name Holm's Ragwort, Holm's Groundsel ITIS Taxonomic Serial No. 530299
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Montane to alpine (8500 to 1400 ft); meadows, rocky areas above timberline.
Plant: Short, erect perennial 4 to 8 inches tall; smooth stems, singly or clusters, reddish-purple.
Leaves: Mostly basal leaves, smooth, hairless, oblanceolate; smaller stem leaves, if any; edges may have irregular teeth; reddish-purple edges, veins, and stalks.
Inflorescence: Nodding composite flower heads with about 13 narrow, yellow rays and numerous yellow disk florets; smooth green or deep reddish-purple phyllaries.
Bloom Period: July and August.
References: "Flora of Colorado" by Jennifer Ackerfield, www.americansouthwest.net and SEINet.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Senecio atratus USDA PLANTS Symbol SEAT
Common Name Tall Black-tip Ragwort ITIS Taxonomic Serial No. 36101
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Foothills to alpine (7000 to 13200 ft.); roadsides, along trails, rocky areas.
Plant: Erect perennial 14 to 32 inches tall, single or multiple stout, hairy, ribbed stems, in clumps.
Leaves: Hairy, oblong-ovate to oblanceolate with pointed tips and shallowly dentate edges, 4 to 12 inches long, petiolate; basal leaves angled upward, stem leaves are alternate.
Inflorescence: Small composite flower heads about 1/2-inch across in large clusters of 20 to 60 heads; about 5 thin yellow rays, 10 to 12 orange disk florets; light green phyllaries below with black tips.
Bloom Period: July to September.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and www.americansouthwest.net.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Senecio bigelovii USDA PLANTS Symbol SEBI2
Common Name Nodding Ragwort, Rayless Senecio ITIS Taxonomic Serial No. 36103
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Montane and subalpine (7800 to 12000 ft.); dry open woods, hillsides and meadows.
Plant: Erect perennial 16 to 40 inches tall, single or a few stems, woolly-hairy (var. hallii) or smooth (var. bigelovii).
Leaves: Ovate to lanceolate, toothed edges, 3 to 6 inches long near base; alternate and much smaller upward; lower leaves usually tapering to petioles (var. hallii) and mid and upper leaves may be weakly clasping; or mid and upper leaves clasping (var. bigelovii).
Inflorescence: Small, nodding, composite flower heads about 1/2-inch across in clusters of 2 to 12 rayless heads, each with many yellow disk florets enclosed by phyllaries, green early and becoming dark purple later in the season; var. hallii with ~21 phyllaries 1/3 to 1/2-inch long and var. bigelovii with ~13, less than 1/3-inch long.
References: "Flora of Colorado" by Jennifer Ackerfield, www.americansouthwest.net and SEINet and Flora of North America.
Notes: The literature indicates that only var. hallii is present in Colorado, however there is evidence to suggest by the images below that var. bigelovii occurs also. See photo 9063/82 below for example.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Senecio eremophilus var. kingii USDA PLANTS Symbol SEERK
Common Name King’s Ragwort, Cutleaf Groundsel, Western Golden Groundsel ITIS Taxonomic Serial No. 530308
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Foothills to subalpine (6000 to 11500 ft.); open areas, roadsides, meadows, streamsides, open woodlands.
Plant: Erect, branched perennial 16 to 40 inches tall, smooth stems.
Leaves: Gray-green basal and stem leaves, ovate to lanceolate outlines, deeply-incised, with toothed edges, hairless.
Inflorescence: Composite flower heads about an inch across in clusters of 3 to 12, seldom as many as 25 nodding (when young) heads, each with about 8 widely-spaced rays, some usually missing, and many darker yellow disk florets; 13 black-tipped phyllaries.
Bloom Period: June to September.
References: "Flora of Colorado" by Jennifer Ackerfield, "Guide to Colorado Wildflowers" by G.K. Guennel, SEINet and www.americansouthwest.net.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Senecio fremontii var. blitoides USDA PLANTS Symbol SEFRB
Common Name Dwarf Mountain Ragwort ITIS Taxonomic Serial No. 530315
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Montane to alpine (9500 to 13500 ft.); rocky areas, talus, crevices, outcrops.
Plant: Short perennial up to 12 inches tall, multiple, leafy, rough stems.
Leaves: Shiny, hairless, thick obovate to spatulate, stem leaves, 1-1/2 to 2-1/2 inches long; coarsely-toothed edges that may be purple-tinged.
Inflorescence: Composite flower heads about 1-1/2 inch across in small clusters (1 to 5 heads), each with 8 to 15 yellow rays around the central yellow/brown disk florets; buds purplish.
Bloom Period: July to September.
References: "Flora of Colorado" by Jennifer Ackerfield, "Guide to Colorado Wildflowers" by G.K. Guennel, www.americansouthwest.net and Flora of North America.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Senecio pudicus USDA PLANTS Symbol SEPU3
Common Name Bashful Ragwort ITIS Taxonomic Serial No. 36172
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Montane to alpine (8000 to 12000 ft.); rocky, damp or drying hillsides, roadsides, woodlands.
Plant: Erect perennial or biennial, 20 to 30 inches tall; single smooth stems, sometimes in clusters.
Leaves: Stem leaves to 6 inches long, becoming smaller upward; narrow, lanceolate, with petioles.
Inflorescence: Rayless nodding flower heads less than 1 inch long and 3/8-inch across in loose, open clusters of 8 to 15 heads; each with about 8 or more green phyllaries surrounding yellow disk florets.
Bloom Period: July to September.
References: "Flora of Colorado" by Jennifer Ackerfield and Flora of North America.
Note: Initially mis-identified as S. bigelovii. Thanks to Jane Hendrix of Breckenridge for providing the correct ID.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Senecio soldanella USDA PLANTS Symbol SESO
Common Name Colorado Ragwort ITIS Taxonomic Serial No. 36183
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Alpine (11200 to 14000 ft.); talus, tundra, rocky areas.
Plant: Short perennial 2 to 8 inches tall, succulent-looking plant; may have purplish stems.
Leaves: Mostly basal, green or purple-tinged, obovate to ovate, 3/4 to 2 inches long, with long petioles; edges may have small teeth.
Inflorescence: Single, composite flower heads about an inch across, with about 13 short yellow rays; relatively large center with many darker yellow disk florets.
Bloom Period: July and August.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and others.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Senecio triangularis USDA PLANTS Symbol SETR
Common Name Arrowleaf Groundsel, Arrowleaf Ragwort ITIS Taxonomic Serial No. 36090
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Montane and subalpine (6500 to 13500 ft.); moist areas in meadows, along streams and ponds.
Plant: Perennial, 1 to 5 feet tall, with usually smooth, stout, leafy stems.
Leaves: Alternate, triangular-shaped, 1-3/4 to 8 inches long and half as wide; coarsely-toothed edges and smooth surfaces.
Inflorescence: Composite flower heads about an inch across in corymb-like clusters of 10 to 30; each flower with about 8 narrow yellow rays and relatively small center with darker yellow disk florets; green, smooth phyllaries below.
Bloom Period:July to September.
References: "Flora of Colorado" by Jennifer Ackerfield, "Guide to Colorado Wildflowers" by G.K. Guennel and SEINet.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Senecio wootonii USDA PLANTS Symbol SEWO
Common Name Wooton's Ragwort ITIS Taxonomic Serial No. 36196
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Montane and subalpine (8000 to 11500 ft.); dryer areas in rocky, moderately disturbed sites and coniferous forests.
Plant: Smooth perennial 6 to 20 inches tall; single to several stems.
Leaves: Lanceolate to ovate or obovate, green to light-green, prominent center vein, smooth or toothed edges; basal leaves about 4 inches long on long, winged petioles; stem leaves fewer, much shorter and alternate.
Inflorescence: Clusters of 8 to 24 or more blossoms in corymb arrays; each about an inch across with 8 to 10 narrow yellow rays; center with darker yellow disk florets.
Bloom Period: June to August.
References: "Flora of Colorado" by Jennifer Ackerfield and SEINet.
BONAP Distribution Map

Colorado Status:
Native
© Tom Lebsack 2020