Bidens beckii

Torrey ex Sprengel

Neue Entd. 2: 135. 1821.

Common names: Bident de Beck
Endemic
Synonyms: Megalodonta beckii (Torrey ex Sprengel) Greene
Treatment appears in FNA Volume 21. Treatment on page 209. Mentioned on page 205, 206.

Perennials (perhaps flowering first-year) to 200+ cm (aquatics). Leaves sessile; submersed blades multifid (2–3+-pinnatisect), ultimate lobes filiform, mostly 0.1–0.3 mm diam.; aerial blades ovate to lanceolate, 10–45+ × 5–20+ mm, bases cuneate, margins pectinately incised to serrate or entire, not ciliate, apices obtuse to acuminate or attenuate, faces glabrous. Heads usually borne singly. Peduncles (10–) 20–100 mm. Calyculi of 5–6 usually spreading, oblong to obovate bractlets 5–8 mm, margins entire, not ciliate, abaxial faces usually glabrous. Involucres ± hemispheric, 7–12 × 12–15 mm. Phyllaries 7–8+, ovate, 7–10 mm. Ray-florets 8; laminae yellow, 10–15 mm. Disc-florets 10–30+; corollas pale-yellow, 5–6 mm. Cypselae (outer and inner ± alike) yellowish to greenish brown, nearly terete or weakly 4-angled, ± linear, 10–15 mm, margins not barbed or ciliate, apices truncate, faces smooth or ± striate, glabrous; pappi of 2 (–6) divergent to patent, retrorsely barbed (on distal 1/4 or so) awns 13–25 (–40) mm. 2n = 26.


Phenology: Flowering Jul–Sep.
Habitat: Still or slow-moving waters
Elevation: 0–300+ m

Distribution

V21-506-distribution-map.gif

B.C., Man., N.B., N.S., Ont., Que., Sask., Conn., Idaho, Ill., Ind., Iowa, Maine, Mass., Mich., Minn., Mo., Mont., N.H., N.J., N.Y., Ohio, Oreg., Pa., R.I., Vt., Wash., Wis.

Discussion

M. L. Roberts (1985) presented a strong case for treating Bidens beckii as Megalodonta beckii.

Lower Taxa

None.
... more about "Bidens beckii"
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 +
Torrey ex Sprengel +
ciliate +  and barbellate +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1.3 cm13 mm <br />0.013 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
cuneate +
compound +  and simple +
1 cm10 mm <br />0.01 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
aerial +  and submersed +
ovate;lanceolate +
5mm;20mm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
erect +  and spreading or reflexed +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
barbellulate +  and barbellate +
Bident de Beck +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
yellowish +  and greenish brown +
4-angled +  and terete +
fertile +  and bisexual +
fertile +  and bisexual +
sessile +  and petiolate +
B.C. +, Man. +, N.B. +, N.S. +, Ont. +, Que. +, Sask. +, Conn. +, Idaho +, Ill. +, Ind. +, Iowa +, Maine +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, N.H. +, N.J. +, N.Y. +, Ohio +, Oreg. +, Pa. +, R.I. +, Vt. +, Wash. +  and Wis. +
0–300+ m +
glabrous +, striate +  and smooth +
tuberculate +, striate +  and scabrellous +
linear-fusiform;4-angled;ovate;orbiculate;oblong;linear;cuneate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Still or slow-moving waters +
discoid +  and radiate +
disciform +  and discoid +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
hemispheric +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
whorled +  and opposite +
deltate +
ciliate +  and not barbed +
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 /> (2 cm20 mm <br />0.02 m <br />) +
2 cm20 mm <br />0.02 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Flowering Jul–Sep. +
connate +  and distinct +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
styliferous +  and neuter +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
roberts1985a +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Megalodonta beckii +
Bidens beckii +
species +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
toothed +, serrate +, laciniate +  and dentate +
0 cm0 mm <br />0 m <br /> (200 cm2,000 mm <br />2 m <br />) +
shrub +  and subshrub +