Acanthospermum Schrank (Q2716)

From Canadian Flora Commons
Jump to navigation Jump to search
Acanthospermum is a taxon with the rank genus within the tribe Heliantheae
Language Label Description Also known as
English
Acanthospermum Schrank
Acanthospermum is a taxon with the rank genus within the tribe Heliantheae

    Statements

    taxon/id/Acanthospermum Schrank
    0 references
    Acanthospermum Schrank
    Acanthospermum
    Schrank
    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
    mostly tropical to warm-temperate New World
    also in Old World
    Stems erect to ± prostrate (repeatedly “forked”).
    petiolate or ± sessile;
    blades mostly elliptic to deltate, rhombic, or ovate, sometimes lyrate, ultimate margins entire or toothed, faces usually pilosulous to sericeous or scabrellous, sometimes glabrate or glabrescent, usually glanddotted.
    Heads radiate, 1 (–3) in “forks” of branches (terminal, appearing axillary by sympodial growth).
    (becoming ± rotate in fruit).
    Phyllaries persistent (outer) or falling, 10–13 in 2 series (outer 4–6 herbaceous, inner 5–8 each investing a ray ovary, enlarging in fruit to form a perigynium, shed with enclosed cypsela).
    Receptacles convex, paleate (paleae cuneate to spatulate, ± conduplicate or flattish, membranous).
    Ray-florets 5–8, pistillate, fertile;
    corollas yellowish (tubes shorter than to equaling laminae, laminae ovate to elliptic or linear).
    Disc-florets 3–8 (–12+), functionally staminate;
    corollas yellowish, tubes shorter than funnelform or campanulate throats, lobes 5, deltate.
    Cypselae each enclosed within and shed with an often hardened, ± prickly perigynium (the ultimate “fruits” plumply ellipsoid to fusiform, or ± compressed);