Pseudognaphalium micradenium

(Weatherby) G. L. Nesom

Sida 19: 618. 2001.

Common names: Delicate rabbit-tobacco
Endemic
Basionym: Gnaphalium obtusifolium var. micradenium Weatherby Rhodora 25: 22. 1923
Synonyms: Gnaphalium helleri var. micradenium (Weatherby) Mahler Pseudognaphalium helleri subsp. micradenium (Weatherby) Kartesz
Treatment appears in FNA Volume 19. Treatment on page 421. Mentioned on page 415, 416.

Annuals (fragrant), 15–60 cm; taprooted or fibrous-rooted. Stems glandular-puberulent (without persistent tomentum), stipitate-glands 0.1–0.2 mm, stalks narrower than gland widths. Leaf-blades linear to linear-lanceolate or linear-oblanceolate, 1.5–5.5 cm × 1.5–10 mm, bases not clasping, not decurrent, margins flat, faces bicolor, abaxial white to gray, tomentose, adaxial green, both minutely stipitate-glandular. Heads in corymbiform arrays. Involucres turbinate-campanulate, 5–6 mm. Phyllaries in 4–6 series, white to tawny white (hyaline, shiny), narrowly ovate to oblong, glabrous. Pistillate florets 47–78. Bisexual florets (7–) 11–20. Cypselae ridged, smooth.


Phenology: Flowering Sep–Oct.
Habitat: Dry woods and openings, roadsides
Elevation: 10–600 m

Distribution

V19-689-distribution-map.gif

Ga., Ind., Ky., Maine, Md., Mass., Mich., Minn., Mo., N.H., N.J., N.Y., N.C., Pa., S.C., Tenn., Va., Wis.

Discussion

Pseudognaphalium micradenium has a more northern and Appalachian distribution than P. helleri. A report of P. micradenium for Louisiana probably was based on specimens of P. helleri. The two species differ in vestiture and other features; stems of P. micradenium are more slender than those of its close relatives.

Selected References

None.

Lower Taxa

None.

"narrower" is not a number.

white +  and gray +
stipitate-glandular +
scarious +
mostly ovate +  and lanceovate or linear +
indeterminate +  and determinate +
Guy L. Nesom +
(Weatherby) G. L. Nesom +
not decurrent +
Gnaphalium obtusifolium var. micradenium +
compound +  and simple +
mostly narrowly lanceolate;oblanceolate +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
Delicate rabbit-tobacco +
actinomorphic +
Ga. +, Ind. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Pa. +, S.C. +, Tenn. +, Va. +  and Wis. +
10–600 m +
papillate-roughened +
winged +  and beaked +
dispersed +
Dry woods and openings, roadsides +
singly +  and aggregated +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
turbinate-campanulate +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (1 cm10 mm <br />0.01 m <br />) +
cauline +  and basal +
rarely lanceovate +  and lanceolate +
2-carpellate +
persistent +
Flowering Sep–Oct. +
bearing subulate enations +, hairy +  and bristly +
conic;more or less columnar +
4 +  and 6 +
exalbuminous +
decumbent +  and procumbent +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
appendaged +  and truncate +
papillate +
Gnaphalium helleri var. micradenium +  and Pseudognaphalium helleri subsp. micradenium +
Pseudognaphalium micradenium +
Pseudognaphalium +
species +
fibrous-rooted +  and taprooted +
150 cm1,500 mm <br />1.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
15 cm150 mm <br />0.15 m <br /> (60 cm600 mm <br />0.6 m <br />) +
shrub +  and subshrub +