Bidens Linnaeus (Q2554)
Jump to navigation
Jump to search
Bidens is a taxon with the rank genus within the tribe Coreopsideae
| Language | Label | Description | Also known as |
|---|---|---|---|
| English |
Bidens Linnaeus
|
Bidens is a taxon with the rank genus within the tribe Coreopsideae
|
Statements
taxon/id/Bidens Linnaeus
0 references
Bidens Linnaeus
Bidens
Linnaeus
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
1 reference
Stems usually 1, usually erect, (terete or 4-angled, often striate or sulcate) branched distally or ± throughout.
1 reference
Leaves usually cauline;
1 reference
usually opposite, rarely whorled, distal sometimes alternate;
1 reference
petiolate or sessile;
1 reference
blades simple, compound (leaflets petiolulate), or 1–3+-pinnatisect or pinnately lobed (submerged leaves multifid in B. beckii, an aquatic), ultimate margins entire, dentate, laciniate, serrate, or toothed, faces usually glabrous, sometimes hirtellous, hispidulous, pilosulous, puberulent, scabrellous, or strigillose.
1 reference
Heads usually radiate or discoid, sometimes ± disciform, usually in corymbiform arrays, sometimes in 2s or 3s or borne singly.
1 reference
Calyculi of (3–) 5–13 (–21+) erect to spreading or reflexed, ± herbaceous (sometimes foliaceous) bractlets or bracts (sometimes surpassing phyllaries).
1 reference
Involucres mostly hemispheric or campanulate to cylindric, (1–) 4–12 (–25+) mm diam.
1 reference
Phyllaries persistent, mostly (4–) 8–21 (–30+) in ± 2 series, usually distinct, sometimes connate 0.05–0.1 their lengths, mostly oblong or ovate to lance-oblong, chartaceous to membranous or scarious (usually striate with brownish nerves, margins usually hyaline).
1 reference
Receptacles flat or slightly convex, paleate;
1 reference
paleae usually falling, (usually stramineous, sometimes yellow to orange, with darker striae) ± flat to slightly navicular.
1 reference
Ray-florets usually 1–21+ (often 3, 5, 8, or 13), sometimes 0, usually neuter, sometimes styliferous and sterile;
1 reference
corollas usually yellow, sometimes white or pinkish.
1 reference
Disc-florets (5–) 12–60 (–150+), bisexual, fertile;
1 reference
corollas usually yellow to orange, sometimes whitish [purplish], tubes shorter than throats, lobes (3–) 5, ± deltate (staminal filaments glabrous; style-branch appendages deltate or lanceolate to subulate).
1 reference
Cypselae usually obcompressed to flat, unequally 3–4-angled, and cuneate to oblanceolate or obovate, sometimes (all or inner) ± equally 4-angled and linear-fusiform, rarely subterete, margins (± corky-winged in B. aristosa, B. cernua, and B. polylepis) usually retrorsely, sometimes patently or antrorsely, barbed or ciliate, apices sometimes attenuate, not beaked [beaked], faces smooth, striate, or ± tuberculate, glabrous or hairy, each sometimes with 2 grooves;
1 reference
pappi 0, or persistent, of (1–) 2–4 (–8) usually retrorsely, sometimes antrorsely, barbellate or ciliate, rarely smooth, awns.
1 reference
1 reference
1 reference
branched
distally; distally; more or less throughout; throughout
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
chartaceous
membranous or scarious
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
barbed
sometimes patently; patently; antrorsely
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
smooth
usually retrorsely; sometimes antrorsely; rarely
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
cuneate
oblanceolate or obovate
1 reference
4-angled
sometimes more or less equally
1 reference
1 reference