Page 23: 350 results for involucre
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Crepis biennis (rough hawk's-beard)
... involucre 6-9 mm tall, body of cypsela mostly 3-4 mm long, and stem leaves with linear to lanceolate or oblanceolate blades with revolute margins (vs. C. biennis, with the involucre mostl...
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Arctium tomentosum (woolly burdock)
... involucres 25-45 mm wide, the bracts glabrous or thinly pubescent, and corollas glabrous (vs. A. tomentosum, with involucres 15-25 mm wide, the bracts tomentose, and corollas glandular pu...
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Euphorbia glyptosperma (rib-seeded sandmat)
...and involucres 0.8–1.2 mm in diameter (vs. E. glyptosperma, with faces of the seed with 2–4 prominent, transverse ridges, each cyathium with 1–5 stamens, and involucres 0.6–0.9 mm in diameter).: ...
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Hieracium caespitosum (yellow hawkweed)
Hieracium caespitosum Dumort.. yellow hawkweed. Non-Monocots Composites Facts About: Yellow hawkweed is native to Europe and was introduced as an ornamental into New York in 1879. It...
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Nabalus albus (white rattlesnake-root)
Nabalus albus (L.) Hook.. white rattlesnake-root. Non-Monocots Composites Facts About: White rattlesnake-root is native to deciduous forests and woodlands in New England. Details of ...
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Ambrosia artemisiifolia (common ragweed)
...carpellate involucres with 4 tubercles near apex (vs. A. artemisiifolia, with leaf blades commonly twice pinnately lobed, plants annual, and carepellate involucres with 4-7 sharp spines near or above ...
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Mulgedium pulchellum (Russia blue lettuce)
...rhizomes, involucre 7-12 mm long in flower, becoming 12-15 mm long in fruit, and leaf blades usually lobed with several to many teeth on each lobe (vs. M. pulchellum, the plants perennial, from deep-s...
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Microseris douglasii (Douglas' silverpuffs)
...and involucre composed of bracts of +/- equal length, 3–7 mm tall (vs. M. douglasii, with the pappus composed of only 5 or fewer bristle-tipped scales, and involucre composed of two dissimilar series ...
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Ambrosia psilostachya (perennial ragweed)
...carepellate involucres with 4-7 sharp spines near or above the middle (vs. A. psilostachya, with leaf blades usually once pinnately lobed, plants perennial, and carpellate involucres with 4 tubercles ...
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Ageratum conyzoides (tropical whiteweed)
Ageratum conyzoides L.. tropical whiteweed. Non-Monocots Composites Facts About: A South American native, tropical whiteweed is an escapee from cultivation in parts of the United Sta...