Bidens amplissima

Greene

Pittonia 4: 268. 1901.

EndemicConservation concern
Synonyms: Bidens cernua var. elata Torrey & A. Gray Bidens elata (Torrey & A. Gray) Sherff
Treatment appears in FNA Volume 21. Treatment on page 216. Mentioned on page 208.

Annuals, (30–) 50–120 cm. Leaves sessile or petioles 10–50 mm (winged); blades lance-elliptic to lance-oblong, 80–120 (–250) × 30–100 mm (proximal usually with 1–2 lobes near bases), bases cuneate, margins laciniate to serrate, ciliate, apices acuminate, faces glabrous. Heads in ± corymbiform arrays. Peduncles (10–) 30–70+ mm. Calyculi of 8–10 usually spreading, lance-linear to lanceolate, sometimes ± foliaceous bractlets or bracts 10–20 (–75) mm, margins entire or incised, ciliate, abaxial faces ± hispid at bases. Involucres ± hemispheric or broader, 6–10 × 18–25 mm. Phyllaries 13–16+, oblong to lanceovate, 6–10 mm. Ray-florets 6–11; laminae yellow, 4–8 mm. Disc-florets 50–100+; corollas yellow, 2.5–3.5 mm. Cypselae olivaceous green, ± flattened, unequally 3–4-angled, cuneate, outer 5–6 mm, inner 6–7 mm, margins antrorsely to retrorsely barbed, apices truncate to concave, faces weakly striate, glabrous or sparsely puberulent; pappi 0, or of (1–) 3 (–4) suberect, retrorsely barbed awns 2–4 mm.


Phenology: Flowering Aug–Oct.
Habitat: Seasonal wetlands, borders of ponds, lakes, streams, estuaries
Elevation: 0–100 m

Discussion

Of conservation concern.

For decades, Bidens amplissima was known only from Vancouver Island; it is now known from southwestern British Columbia and northwestern Washington (F. R. Ganders et al. 2003). Occurrences in southern Manitoba and northwestern Nebraska may represent ephemeral introductions. The restricted natural range of B. amplissima has stimulated interest in it, the addition of it to rare plant lists, and the consideration of need for protected sites where it grows.

Lower Taxa

None.
... more about "Bidens amplissima"
not tailed +, rounded +  and obtuse +
dark +  and pale +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John L. Strother +  and Ronald R. Weedon +
Greene +
ciliate +  and barbellate +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
cuneate +
compound +  and simple +
12 cm120 mm <br />0.12 m <br /> (25 cm250 mm <br />0.25 m <br />) +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
lance-elliptic;lance-oblong +
30mm;100mm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
2 cm20 mm <br />0.02 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
2 cm20 mm <br />0.02 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
erect +  and spreading or reflexed +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
barbellulate +  and barbellate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
olivaceous green +
cuneate +, 3-4-angled +  and flattened +
fertile +  and bisexual +
fertile +  and bisexual +
sessile +  and petiolate +
B.C. +  and Wash. +
0–100 m +
puberulent +, glabrous +  and striate +
tuberculate +, striate +  and scabrellous +
linear-fusiform;4-angled;ovate;orbiculate;oblong;linear;cuneate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Seasonal wetlands, borders of ponds, lakes, streams, estuaries +
discoid +  and radiate +
disciform +  and discoid +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hemispheric +
1.8 cm18 mm <br />0.018 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
whorled +  and opposite +
deltate +
incised +, entire +  and laciniate to serrate +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
2-carpellate +
less flat;slightly navicular +
persistent +
of 1-2 , smooth to ciliate or barbed awns or scales +  and coroniform +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Flowering Aug–Oct. +
connate +  and distinct +
13 +  and 16 +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
styliferous +  and neuter +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
ganders2003a +
exalbuminous +
Endemic +  and Conservation concern +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Bidens cernua var. elata +  and Bidens elata +
Bidens amplissima +
species +
toothed +, serrate +, laciniate +  and dentate +
30 cm300 mm <br />0.3 m <br /> (50 cm500 mm <br />0.5 m <br />) +
50 cm500 mm <br />0.5 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
shrub +  and subshrub +