Pseudognaphalium austrotexanum

G. L. Nesom

Sida 19: 507, fig. 1. 2001.

Common names: South Texas rabbit-tobacco
Treatment appears in FNA Volume 19. Treatment on page 422. Mentioned on page 416, 423.

Annuals, 30–70 cm; taprooted. Stems densely and closely white-tomentose-floccose, glabrescent, not glandular. Leaf-blades (crowded, internodes mostly 1–3, sometimes to 10 mm) linear to linear-lanceolate, 2–5 cm × 1–3 mm, bases subclasping, not decurrent, margins strongly revolute, sometimes closely sinuate, faces bicolor, abaxial densely and closely white-tomentose, adaxial green, densely stipitate-glandular, otherwise glabrate. Heads in corymbiform arrays. Involucres broadly campanulate, 4.5–5 mm. Phyllaries in 5–7 series, silvery white (hyaline, shiny), narrowly ovate to oblong or elliptic (apices of inner thickened and slightly raised along midribs, apiculate), glabrous. Pistillate florets [46–] 76–102. Bisexual florets (6–) 8–11. Cypselae ridged, papillate-roughened.


Phenology: Flowering Oct–Dec(–Jan).
Habitat: Sandy soil in pastures, grasslands, open disturbed sites
Elevation: 0–10[–600] m

Distribution

V19-693-distribution-map.gif

Tex., Mexico (Nuevo León)

Discussion

Pseudognaphalium austrotexanum is similar to P. viscosum in general appearance: taprooted annuals with stems white-tomentose, strictly erect, and mostly unbranched proximal to heads, leaves linear to linear-lanceolate, strongly bicolor (green and glandular adaxially, white-tomentose abaxially), loosely to strictly ascending, crowded on relatively short internodes and continuing to immediately proximal to the heads, and basally subclasping but not strongly auriculate, phyllaries silvery white, thin, and hyaline, and cypselae minutely papillate-roughened.

Selected References

None.

Lower Taxa

None.
white +  and gray +
white-tomentose +
glabrate +  and stipitate-glandular +
scarious +
mostly ovate +  and lanceovate or linear +
indeterminate +  and determinate +
Guy L. Nesom +
G. L. Nesom +
subclasping +
not decurrent +
compound +  and simple +
mostly narrowly lanceolate;oblanceolate +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
South Texas rabbit-tobacco +
actinomorphic +
papillate-roughened +
Tex. +  and Mexico (Nuevo León) +
0–10[–600] m +
papillate-roughened +
winged +  and beaked +
dispersed +
Sandy soil in pastures, grasslands, open disturbed sites +
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 />) +
campanulate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
cauline +  and basal +
rarely lanceovate +  and lanceolate +
2-carpellate +
persistent +
Flowering Oct–Dec(–Jan). +
bearing subulate enations +, hairy +  and bristly +
conic;more or less columnar +
4 +  and 6 +
exalbuminous +
decumbent +  and procumbent +
appendaged +  and truncate +
papillate +
Compositae +
Pseudognaphalium austrotexanum +
Pseudognaphalium +
species +
150 cm1,500 mm <br />1.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
30 cm300 mm <br />0.3 m <br /> (70 cm700 mm <br />0.7 m <br />) +
shrub +  and subshrub +