Lasthenia Cassini (Q2857)

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Lasthenia is a taxon with the rank genus within the tribe Madieae
Language Label Description Also known as
English
Lasthenia Cassini
Lasthenia is a taxon with the rank genus within the tribe Madieae

    Statements

    taxon/id/Lasthenia Cassini
    0 references
    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
    Goldfields (English)
    w North America
    nw Mexico
    South America (Chile)
    Stems usually erect, sometimes decumbent, prostrate, or sprawling, simple or branched (usually distally, often proximally in decumbent plants).
    Leaves mostly cauline;
    petiolate or sessile;
    blades usually linear, often 1 (–2) -pinnately lobed, ultimate margins entire or toothed, faces glabrous or hairy.
    Heads usually radiate, sometimes ± disciform (in L. glaberrima and L. microglossa), borne singly or in ± corymbiform arrays.
    Involucres obconic to hemispheric, 3–5+ mm diam.
    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).
    Receptacles hemispheric to narrowly conic or subulate, smooth, papillate, or pitted, glabrous or hairy, epaleate.
    Ray-florets 4–16, pistillate, fertile;
    corollas yellow to orangish (sometimes white in L. debilis, often somewhat darker proximally, laminae rarely lacking in L. glaberrima and L. microglossa).
    Disc-florets 5–100+, bisexual, fertile;
    corollas yellow to orangish (sometimes white in L. debilis), tubes shorter than or about equaling funnelform or campanulate throats, lobes (4–) 5, deltate.
    Cypselae (black to gray) usually cylindric to obovoid, glabrous or hairy, sometimes papillate (flattened, margins fringed with blunt, curved hairs in L. chrysantha);