Krigia virginica

(Linnaeus) Willdenow

Sp. Pl. 3: 1618. 1803.

Common names: Virginia dwarfdandelion
Endemic
Basionym: Hyoseris virginica Linnaeus Sp. Pl. 2: 809. 1753
Treatment appears in FNA Volume 19. Treatment on page 365. Mentioned on page 363, 366.

Annuals, 4–30 cm; taprooted. Stems 1–50+, initially scapiform, later elongate and leafy (after rosette leaves wither), erect, eglandular or stipitate-glandular, especially near heads. Leaves initially produced basally (rosettes); later leaves cauline; sessile or petiolate; blades oblanceolate to spatulate, 1.5–18 cm, usually irregularly pinnately lobed, terminal lobes often denticulate, faces glabrous, eglandular or loosely glandular-villous; cauline (appearing opposite on late-season stems), narrowly oblanceolate to linear, mostly entire. Heads borne singly. Peduncles from rosettes (early) or axillary or terminal on stems (later). Involucres 4.5–8 mm. Phyllaries 9–15, reflexed in fruit, lanceolate, midveins obscure, apices acute. Florets 8–35; corollas yellow, often purplish abaxially, 5–12 mm. Cypselae dark reddish-brown, narrowly obconic, 1.5–2.3 mm, 15–20-ribbed; pappi of 5, hyaline, rounded outer scales 0.5–1 mm plus 5, scabrous inner bristles 4–6 mm. 2n = 10, 20.


Phenology: Flowering Feb–Nov.
Habitat: Sandy, silty, or loam soils, rock outcrops, open mixed mesophytic, northern hardwoods, beach-maple, oak-pine, and oak-hickory woods, pastures, prairies, and roadsides, often in disturbed, weedy sites
Elevation: 0–1200 m

Distribution

V19-581-distribution-map.gif

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

Discussion

Krigia virginica is introduced in British Columbia. It grows in the Eastern deciduous forest biome, tallgrass prairie, and southeastern Coastal Plain. Its weedy habit may lead to introductions outside the present range.

The tetraploid populations of Krigia virginica are believed to have arisen through autoploidy; they are morphologically indistinguishable from the diploids. A single origin for this autoploid event is suggested by the chloroplast DNA studies by K. J. Kim et al. (1992b, 1992c), with marked genetic divergence of the tetraploids having occurred since their origination. Plants collected late in the season have a branching habit remarkably unlike the scapiform vernal form.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Krigia virginica"
reduced +
scarious +
ovate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
Kenton L. Chambers +  and Robert J. O’Kennon +
(Linnaeus) Willdenow +
decurrent +
Hyoseris virginica +
compound +  and simple +
lobed;oblanceolate;spatulate +
1.5 cm15 mm <br />0.015 m <br /> (18 cm180 mm <br />0.18 m <br />) +
tuberculate +, rugose +, muricate +  and smooth +
filiform +
narrowly oblanceolate +  and linear +
Virginia dwarfdandelion +
zygomorphic +, actinomorphic +  and (3-)5-merous +
purplish +  and yellow +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
dark reddish-brown +
B.C. +, Ala. +, Ark. +, Conn. +, Del. +, Fla. +, Ga. +, Ill. +, Ind. +, Iowa +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Tex. +, Vt. +, Va. +, W.Va. +  and Wis. +
0–1200 m +
glandular-villous +  and glabrous +
winged +  and beaked +
dispersed +
Sandy, silty, or loam soils, rock outcrops, open mixed mesophytic, northern hardwoods, beach-maple, oak-pine, and oak-hickory woods, pastures, prairies, and roadsides, often in disturbed, weedy sites +
indeterminate +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
turbinate;campanulate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
petiolate +  and sessile +
lobed +, denticulate +  and entire +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
2-carpellate +
persistent +
Flowering Feb–Nov. +
connate +  and distinct +
9 +  and 15 +
subequal +  and unequal +
low-convex;flat +
10 +  and 20 +
brownish;yellowish +
exalbuminous +
eglandular +  and leafy +
1 +  and 50 +
elongate +  and scapiform +
appendaged +  and truncate +
papillate +
Apogon +, Cymbia +, Cynthia +, Serinia +  and Troximon +
Krigia virginica +
species +
globose +
4 cm40 mm <br />0.04 m <br /> (30 cm300 mm <br />0.3 m <br />) +
shrub +  and subshrub +
9] +, [6 +  and 5 +