Bidens heterosperma

A. Gray

Smithsonian Contr. Knowl. 5(6): 90. 1853.

Treatment appears in FNA Volume 21. Treatment on page 209. Mentioned on page 207.

Annuals, (5–) 10–30 (–60+) cm. Leaves: petioles 3–20 mm; blades usually rounded-deltate overall, 10–30+ × 5–20+ mm, 1–2-pinnatisect, ultimate lobes linear to filiform, 2–25 × 0.5–1 (–2) mm, bases obscurely cuneate, ultimate margins minutely, if at all, ciliate, apices obtuse to acute (sometimes apiculate), faces glabrous or sparsely hirtellous. Heads usually borne singly. Peduncles 10–50 (–100) mm. Calyculi of (1–) 3 (–5), appressed to spreading, linear bractlets (1–) 3 (–4) mm, margins minutely, if at all, ciliate, abaxial faces usually glabrous, sometimes sparsely hispidulous. Involucres ± cylindric, 3.5–5 × (1–) 2–3 mm. Phyllaries 5–6, lance-elliptic to lanceolate, 2.5–4 (–5) mm. Ray-florets 0 or 1–3+; laminae yellowish, 1–4 mm. Disc-florets 5–9 (–13); corollas yellowish, 1–1.5 mm. Cypselae redbrown to blackish (sometimes with lighter blotches), outer ± obcompressed and linear, 3–5 mm, margins not ciliate, apices ± truncate, faces 2-grooved, usually glabrous; inner similar, ± equally 4-angled, linear-fusiform, (6–) 7–12 mm, apices ± attenuate; pappi 0, or of 2 (–3) spreading to divergent, retrorsely barbed awns 1–2 mm.


Phenology: Flowering Sep–Oct.
Habitat: Seeps on rocky slopes
Elevation: 1500–2800 m

Distribution

V21-508-distribution-map.gif

Ariz., Colo., N.Mex., Mexico (Baja California), Mexico (Chihuahua), Mexico (Sinaloa), Mexico (Sonora)

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Bidens heterosperma"
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 +
A. Gray +
ciliate +  and barbellate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
cuneate +
compound +  and simple +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
rounded-deltate +
5mm;20mm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
erect +  and spreading or reflexed +
3 cm30 mm <br />0.03 m <br /> (?) +
barbellulate +  and barbellate +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
redbrown +  and blackish +
subterete +, linear-fusiform +, 4-angled +, cuneate +  and oblanceolate or obovate +
fertile +  and bisexual +
fertile +  and bisexual +
sessile +  and petiolate +
Ariz. +, Colo. +, N.Mex. +, Mexico (Baja California) +, Mexico (Chihuahua) +, Mexico (Sinaloa) +  and Mexico (Sonora) +
1500–2800 m +
glabrous +  and hirtellous +
tuberculate +, striate +  and scabrellous +
linear-fusiform;4-angled;ovate;orbiculate;oblong;linear;cuneate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Seeps on rocky slopes +
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 />) +
linear-fusiform +  and 4-angled +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
sessile +  and petiolate +
whorled +  and opposite +
deltate +
hispidulous +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
2-carpellate +
less flat;slightly navicular +
persistent +
of 1-2 , smooth to ciliate or barbed awns or scales +  and coroniform +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering Sep–Oct. +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
connate +  and distinct +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Smithsonian Contr. Knowl. +
styliferous +  and neuter +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Megalodonta +
Bidens heterosperma +
species +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
linear;filiform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
toothed +, serrate +, laciniate +  and dentate +
30 cm300 mm <br />0.3 m <br /> (60 cm600 mm <br />0.6 m <br />) +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
shrub +  and subshrub +