Arctium minus

(Hill) Bernhardi

Syst. Verz., 154. 1800.

Common names: Common or lesser burdock petite bardane cibourroche chou bourache bourrier
IntroducedIllustrated
Basionym: Lappa minor Hill Veg. Syst. 4: 28. 1762
Treatment appears in FNA Volume 19. Treatment on page 170. Mentioned on page 169, 171.

Plants to 50–300 cm. Basal leaves: petioles hollow (sometimes only at base), 15–50 cm, thinly to densely cobwebby; blades 30–60 × 15–35 cm, coarsely dentate to subentire (rarely deeply dissected), abaxially ± thinly gray-tomentose, adaxially green, sparsely short-hairy. Heads in racemiform or paniculiform clusters, sessile to pedunculate. Peduncles 0–9.5 cm. Involucres 15–40 mm diam. Phyllaries linear to linear-lanceolate, glabrous to densely cobwebby, inner often purplish tinged, margins often minutely serrate with fine teeth, puberulent with glandular and or eglandular hairs. Florets 30+; corollas purple, pink, or white, 7.5–12 mm, glabrous or limb glandular-puberulent. Cypselae dark-brown or with darker spots, 5–8 mm; pappus bristles 1–3.5 mm. 2n = 32 (Germany), 36 (as A. nemorosum).


Phenology: Flowering summer–early fall (Jul–Sep).
Habitat: Waste places, roadsides, fields, forest clearings
Elevation: 0–2200 m

Distribution

V19-186-distribution-map.gif

Introduced; St. Pierre and Miquelon, Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Sask., Ala., Ariz., Ark., Calif., Colo., Conn., Del., D.C., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo., Eurasia

Discussion

Arctium minus has been reported from Delaware and Texas; I have not seen specimens.

Arctium minus is a complex species with many variants that have been recognized at ranks ranging from forma to species (J. Arènes 1950). Some North American workers (e.g., R. J. Moore and C. Frankton 1974) have often distinguished plants with involucres more than 3 cm diameter that equal or overtop the corollas as A. nemorosum. Arènes treated those plants as a subspecies of A. minus. Arctium nemorosum was recognized as a species distinct from A. minus (H. Duistermaat 1996), with a different and more restricted circumscription than that used by North American workers. Although most of the characters that Duistermaat used to separate those A. nemorosum from A. minus overlap extensively, the consistently wider mid phyllaries of A. nemorosum (1.7–2.5 mm wide versus 0.6–1.6 mm in A. minus) supposedly distinguish the species. None of the North American specimens examined in preparation of this treatment had the wide phyllaries of A. nemorosum in the sense of Duistermaat, who stated that she had seen no material of this taxon from the American continent. Some American authors have taken up the name Arctium vulgare in place of A. nemorosum and applied A. vulgare (dubbed woodland burdock) to the larger-headed North American plants. Duistermaat considers A. vulgare to be a synonym of A. lappa.

Selected References

None.

Lower Taxa

None.

"fine" is not a number."fine" is not a number.

... more about "Arctium minus"
scarious +
obtuse +  and acute +
racemiform +  and paniculiform or corymbiform +
indeterminate +  and determinate +
David J. Keil +
(Hill) Bernhardi +
decurrent +
Lappa minor +
compound +  and simple +
30 cm300 mm <br />0.3 m <br /> (60 cm600 mm <br />0.6 m <br />) +
short-hairy +  and gray-tomentose +
coarsely dentate;subentire +
15cm;35cm +
10-nerved or 20-nerved +  and rugose +
Common or lesser burdock +, petite bardane +, cibourroche +, chou bourache +  and bourrier +
actinomorphic +
white +, pink +  and purple +
0.75 cm7.5 mm <br />0.0075 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
with darker spots +  and dark-brown +
compressed +  and obovoid +
fertile +  and bisexual +
St. Pierre and Miquelon +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Ala. +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Utah +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Wyo. +  and Eurasia +
0–2200 m +
tomentose +  and resin-gland-dotted +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Waste places, roadsides, fields, forest clearings +
sessile +  and pedunculate +
indeterminate +
each +  and sessile +
erect +  and ascending +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
spheric;ovoid +
long-petiolate +
cauline +  and basal +
smaller +
glandular-puberulent +
triangular +
usually lobed +  and dissected +
2-carpellate +
0.1 cm1 mm <br />0.001 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
persistent +
0 cm0 mm <br />0 m <br /> (9.5 cm95 mm <br />0.095 m <br />) +
15 cm150 mm <br />0.15 m <br /> (50 cm500 mm <br />0.5 m <br />) +
Flowering summer–early fall (Jul–Sep). +
glabrous +  and densely cobwebby +
papillate +  and smooth +
distinct +  and fused +
hairy-ringed +
Syst. Verz., +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
subulate +
exalbuminous +
Introduced +  and Illustrated +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
Compositae +
Arctium minus +
species +
campanulate +
elongate +
perennial +  and biennial +
50 cm500 mm <br />0.5 m <br /> (300 cm3,000 mm <br />3 m <br />) +