Lasthenia Cassini (Q2857)
Lasthenia is a taxon with the rank genus within the tribe Madieae
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Lasthenia Cassini
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Lasthenia is a taxon with the rank genus within the tribe Madieae
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Statements
taxon/id/Lasthenia Cassini
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Lasthenia Cassini
Lasthenia
Cassini
FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 21: Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford University Press, New York.
accepted
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Stems usually erect, sometimes decumbent, prostrate, or sprawling, simple or branched (usually distally, often proximally in decumbent plants).
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Leaves mostly cauline;
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petiolate or sessile;
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blades usually linear, often 1 (–2) -pinnately lobed, ultimate margins entire or toothed, faces glabrous or hairy.
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Heads usually radiate, sometimes ± disciform (in L. glaberrima and L. microglossa), borne singly or in ± corymbiform arrays.
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Involucres obconic to hemispheric, 3–5+ mm diam.
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Phyllaries usually persistent, sometimes falling with cypselae, 4–18 in 1 (–2) series (usually ± erect in fruit, distinct or ± connate, narrowly oblong to broadly ovate, mostly herbaceous, bases flat or weakly cupped, faces not woolly, except sometimes in L. minor and L. platycarpha).
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Receptacles hemispheric to narrowly conic or subulate, smooth, papillate, or pitted, glabrous or hairy, epaleate.
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Ray-florets 4–16, pistillate, fertile;
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corollas yellow to orangish (sometimes white in L. debilis, often somewhat darker proximally, laminae rarely lacking in L. glaberrima and L. microglossa).
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Disc-florets 5–100+, bisexual, fertile;
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corollas yellow to orangish (sometimes white in L. debilis), tubes shorter than or about equaling funnelform or campanulate throats, lobes (4–) 5, deltate.
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Cypselae (black to gray) usually cylindric to obovoid, glabrous or hairy, sometimes papillate (flattened, margins fringed with blunt, curved hairs in L. chrysantha);
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disciform
sometimes more or less
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in more or less corymbiform arrays
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hemispheric
narrowly conic or subulate
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