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Lapsana
Family: Asteraceae
Lapsana image
Paul Rothrock
  • FNA
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David J. Bogler in Flora of North America (vol. 19, 20 and 21)
Annuals [biennials], 15-150 cm; fibrous-rooted. Stems 1, erect, simple or branched, glabrate to sparsely or densely pilose, hairs often stipitate-glandular. Leaves basal and cauline (not in rosettes); narrowly winged-petiolate; blades ovate to suborbiculate (thin), margins entire, dentate, or lyrate-pinnatifid proximally (terminal lobes larger than laterals, faces glabrate to sparsely hirsute; distal sessile, lanceolate, reduced). Heads in open, corymbiform to thyrsiform arrays. Peduncles (slender) slightly inflated distally, ebracteate. Calyculi of 4-5 subulate or scalelike, glabrous bractlets. Involucres cylindric to campanulate, 2-5 mm diam. Phyllaries 8-10 in 1 series, linear-oblong, subequal, (strongly keeled) margins green, not scarious, apices acute, faces glabrous. Receptacles flat, smooth, glabrous, epaleate. Florets 8-15; corollas yellow. Cypselae dimorphic (outer much longer than inner), tan to golden brown, subcylindric, curved, terete to slightly compressed, not beaked, ± 20-ribbed, glabrous; pappi 0. . = 7. Lapsana formerly included about 9 species, some from eastern Asia. Based on cladistic analysis of morphologic characters, the eastern Asian species have been removed to Lapasanastrum, a strongly supported monophyletic group characterized by spreading phyllaries and distinctive fruit anatomy (J. H. Pak and K. Bremer 1995).

Vascular plants of NE US and adjacent Canada
Fls all ligulate and perfect, yellow; invol cylindric-campanulate, minutely calyculate, the inner bracts subequal, uniseriate, keeled; achenes narrow, subterete or slightly compressed, often curved, narrowed to both ends, usually more gradually so downwards, 18-30-nerved, 5 or 6 of the nerves generally stronger; pappus none; branching, annual, lactiferous herbs, with alternate, entire to pinnatifid lvs and several to many small, rather few-fld heads, the peduncles tending to be apically pale and indurate. 9, temp. Eurasia.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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Lapsana apogonoides
Images
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Lapsana communis
Image of Lapsana communis
The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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