Descurainia species

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Scientific Name Descurainia incana USDA PLANTS Symbol DEIN5
Common Name Mountain Tansy-mustard ITIS Taxonomic Serial No. 502003
Family Brassicaceae (Mustard) SEINet
Reference
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Description Life zones and habitat: Foothills to subalpine (5300 to 11500 ft.); gravelly areas, grassy slopes, steep rocky slopes, roadsides, disturbed sites, meadows, prairies.
Plant: Erect biennial 10 to 48 inches tall; thin, leafy stem, smooth or slightly hairy, not glandular, with branches above.
Leaves: Deeply-lobed (pinnatifid) leaves, stem leaves alternate; lobes linear to oblong or narrowly lanceolate.
Inflorescence: Custers of flowers in racemes at leaf nodes and top of stem; compact but becoming elongated at fruiting; small flowers with four yellow sepals and four yellow petals, all less than 1/10 inch long.
Bloom Period: May to August.
Fruit: About 3/8-inch long or less, erect and appressed (hugging the stem), slightly torulose and attached by stalks about the same length.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and www.americansouthwest.net.
BONAP Distribution Map
Colorado Status:
Native
Scientific Name Descurainia incisa ssp. incisa USDA PLANTS Symbol DEINI2
Common Name Mountain Tansy-mustard ITIS Taxonomic Serial No. 823353
Family Brassicaceae (Mustard) SEINet
Reference
Click Here
Description Life zones and habitat: Foothills to montane (5500 to 10000 ft.); meadows, roadsides, streamsides, wooded areas.
Plant: Erect perennial 6 to 33 inches tall; erect stems usually unbranched below and branched above, may be glandular or not and densely to sparsely pubescent.
Leaves: Pinnate basal leaves, obovate to oblanceolate in outline, 5/8 to 4 inches long with 2 to 9 pairs of lateral lobes with dentate to incised or entire margins; smaller stem leaves are sessile or short-petiolate, with oblong, lanceolate or linear lobes with dentate to denticulate or entire margins.
Inflorescence: Custers of flowers in racemes at leaf nodes and top of stem; compact but becoming elongated at fruiting; small flowers with four yellow sepals and four yellow petals, all less than 1/10 inch long.
Bloom Period: June to August.
Fruit: Less than 3/4-inch long, erect and appressed (hugging the stem), straight or somewhat curved inward, slightly torulose and attached by stalks about the same length.
References: "Flora of Colorado" by Jennifer Ackerfield, Flora of North America and www.americansouthwest.net.
BONAP Distribution Map
Colorado Status:
Native

© Tom Lebsack 2020