Eutrochium fistulosum

(Barratt) E. E. Lamont

Sida 21: 901. 2004.

Common names: Trumpetweed hollow joepyeweed
Endemic
Basionym: Eupatorium fistulosum Barratt Eupatoria Verticillata, no. 1. 1841
Synonyms: Eupatoriadelphus fistulosus (Barratt) R. M. King & H. Robinson Eupatorium purpureum var. angustifolium Torrey & A. Gray
Treatment appears in FNA Volume 21. Treatment on page 478. Mentioned on page 475.

Plants 60–350+ cm. Stems usually purple throughout, sometimes greenish or purple-spotted, hollow proximally, usually glabrous proximally (rarely pubescent toward bases when young), ± glandular-puberulent distally and among heads (glaucous throughout, at least when fresh). Leaves mostly in 4s–6s (–7s); petioles (5–) 10–30 (–50) mm, glabrous; blades pinnately veined, narrowly to broadly lanceolate, mostly (8–) 12–25 (–28) × (1.5–) 2–6 (–9) cm, bases gradually tapered, margins finely serrate (teeth rounded, blunt), abaxial faces sparingly and minutely ± scabrellous to glabrate, adaxial faces glabrous or sparingly puberulent. Heads in convex to rounded (dome-shaped), compound corymbiform arrays (ultimately broadly cylindric). Involucres often purplish, 6.5–9 × 2.5–5 mm. Phyllaries glabrous or outer with hairs on midveins. Florets (4–) 5–7; corollas usually pale pinkish or purplish, 4.5–6 mm. Cypselae 3–4.5 mm. 2n = 20.


Phenology: Flowering late summer–early fall.
Habitat: Wet lowlands, alluvial woods, along streams, moist meadows, bogs, marshes with permanently saturated or seasonally flooded organic soils, open sun or partial shade
Elevation: 10–1400+ m

Distribution

V21-1200-distribution-map.gif

Ala., Ark., Conn., Del., Fla., Ga., Ill., Ind., Ky., La., Maine, Md., Mass., Mich., Miss., Mo., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Va., W.Va.

Discussion

In the field, Eutrochium fistulosum is the most distinct species of the genus; herbarium specimens do not always document the distinguishing characteristics: heights commonly surpassing 2 m, proximal stem diameters usually 2 cm or greater, stems strongly glaucous (mostly hollow, sometimes distally hollow), leaves commonly 6 or 7 per node, arrays of heads commonly 30 × 22 cm.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Eutrochium fistulosum"
puberulent +  and glabrous +
not tailed +, truncate +, rounded +  and obtuse +
scarious +
usually ovate +  and lanceolate +
usually terete +  and clavate +
corymbiform +  and compound +
indeterminate +  and determinate +
convex +  and rounded +
Eric E. Lamont +
(Barratt) E. E. Lamont +
puberulent +
tapered +
enlarged +
Eupatorium fistulosum +
25 cm250 mm <br />0.25 m <br /> (28 cm280 mm <br />0.28 m <br />) +
6 cm60 mm <br />0.06 m <br /> (9 cm90 mm <br />0.09 m <br />) +
12 cm120 mm <br />0.12 m <br /> (25 cm250 mm <br />0.25 m <br />) +
dissected +, lobed +, toothed +  and entire +
lanceolate +
2cm;6cm +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
less filiform;clavate +
Trumpetweed +  and hollow joepyeweed +
purplish +  and pale pinkish +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
scabrellous +
prismatic +
fertile +  and bisexual +
Ala. +, Ark. +, Conn. +, Del. +, Fla. +, Ga. +, Ill. +, Ind. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Miss. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Tex. +, Va. +  and W.Va. +
10–1400+ m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Wet lowlands, alluvial woods, along streams, moist meadows, bogs, marshes with permanently saturated or seasonally flooded organic soils, open sun or partial shade +
in usually determinate , rarely indeterminate , arrays +  and singly +
indeterminate +
each +  and sessile +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
opposite +  and whorled +
ovate +  and deltate +
2-carpellate +
persistent +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering late summer–early fall. +
10 +  and 22 +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
purple-spotted +  and greenish +
appendaged +  and truncate +
hirsutulous +
papillate +
Eupatoriadelphus fistulosus +  and Eupatorium purpureum var. angustifolium +
Eutrochium fistulosum +
Eutrochium +
species +
30 cm300 mm <br />0.3 m <br /> (350 cm3,500 mm <br />3.5 m <br />) +