Tetraneuris linearifolia var. arenicola

Bierner

Sida 15: 237. 1992.

Treatment appears in FNA Volume 21. Treatment on page 449. Mentioned on page 448.

Plants 21–50+ cm. Stems (1–) 4–10, erect or ± decumbent, unbranched or branched distally. Leaves usually densely hairy, sparsely to moderately glanddotted, basal blades usually spatulate, usually with 2–6 teeth or lobes; proximal cauline blades usually oblanceolate, usually with 2 (–6) teeth or lobes, mid-blades usually oblanceolate, (2.5–) 3.9–9.5 (–16) mm wide. Peduncles (10–) 13–22 (–29) cm, densely hairy. Involucres 8–10 × 12–15 mm. Outer phyllaries 13–21, margins usually not scarious, abaxial faces densely hairy. Ray-florets 14–25. Cypselae 1.9–2.6 mm, pappi of 5–8 non-aristate scales 1–1.7 mm. 2n = 30.


Phenology: Flowering (Feb–)Mar–Apr(–Jun; also Dec).
Habitat: Roadsides and pastures
Elevation: 50–200 m

Discussion

Variety arenicola is known only from the vicinity of Brooks, Hidalgo, Jim Hogg, and Zapata counties. It grows in sand; var. linearifolia grows in limestone-derived soils.

Selected References

None.

Lower Taxa

None.
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Mark W. Bierner +  and Billie L. Turner +
Bierner +
with 2-6 teeth or lobes +  and entire +
decurrent +
Hymenoxys linearifolia +
compound +  and simple +
lobed;mostly oblanceolate;linear or filiform +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
with 1-2 teeth or lobes +  and entire +
narrowly oblanceolate;linear-oblanceolate +
50–200 m +
more or less +  and eglandular +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides and pastures +
discoid +  and radiate +
in corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hemispheric;campanulate +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
0mm +  and 0.2mm +
with 1-2 teeth or lobes +  and entire +
oblanceolate +
3.9mm;9.5mm +
connate +  and distinct +
ovate +, oblong +, oblanceolate +, linear +, lanceolate +  and elliptic +
unequal +  and subequal +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
2-carpellate +
persistent +
22 cm220 mm <br />0.22 m <br /> (29 cm290 mm <br />0.29 m <br />) +
13 cm130 mm <br />0.13 m <br /> (22 cm220 mm <br />0.22 m <br />) +
Flowering (Feb–)Mar–Apr(–Jun +  and also Dec). +
11 +  and 60 +
with 2-6 teeth or lobes +  and entire +
bearing subulate enations +, hairy +  and bristly +
hemispheric;conic +
5 +  and 8 +
non-aristate +
0.1 cm1 mm <br />0.001 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
exalbuminous +
branched +  and unbranched +
1 (?) +  and 4 (?) +
decumbent +  and erect +
4 +  and 10 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Tetraneuris linearifolia var. arenicola +
Tetraneuris linearifolia +
variety +
urceolate +  and campanulate +
dilated +
16 cm160 mm <br />0.16 m <br /> (50 cm500 mm <br />0.5 m <br />) +