Tetraneuris linearifolia

(Hooker) Greene

Pittonia 3: 269. 1898.

Basionym: Hymenoxys linearifolia Hooker Icon. Pl. 2: plate 146. 1837
Treatment appears in FNA Volume 21. Treatment on page 448. Mentioned on page 447.

Annuals, 16–50+ cm. Caudices none. Stems 1–10, erect or ± decumbent, leafy, unbranched or branched distally. Leaves basal and cauline, ± hairy, ± glanddotted; basal blades spatulate to oblanceolate, entire or with 2–6 teeth or lobes; proximal cauline blades narrowly spatulate or oblanceolate to linear-oblanceolate, entire or with 2–6 teeth or lobes; mid-blades oblanceolate to linear-oblanceolate to linear, 0.9–9.5 (–16) mm wide, entire or with 1–2 teeth or lobes; distal blades narrowly oblanceolate to linear-oblanceolate to linear, entire or with 1–2 teeth or lobes. Heads 8–50 (–80) per plant, borne singly or in corymbiform arrays. Peduncles 8–29 cm, ± hairy. Involucres 5–10 × 7–15 mm. Outer phyllaries 8–21, 2.4–5.5 mm, margins 0–0.2 mm wide, not scarious or scarious, abaxial faces ± hairy. Ray-florets 9–25; corollas 8.2–16.8 mm. Disc-florets 50–200+; corollas yellow, 1.6–3 mm. Cypselae 1.5–2.6 mm; pappi of 4–8 obovate, often aristate scales 1–2.5 mm.

Distribution

V21-1121-distribution-map.gif

Kans., N.Mex., Okla., Tex., n Mexico

Discussion

Varieties 2 (2 in the flora).

Plants of Tetraneuris linearifolia morphologically intermediate between the two varieties are found in Bee, Duval, Live Oak, and McMullen counties, Texas.

Selected References

None.

Key

1 Stems erect, branched distally; leaves ± hairy, basal blades entire or with 2(–6) teeth or lobes, proximal cauline blades entire or with 1–2 teeth or lobes, mid blades (0.9–)1.4–3(–4.8) mm wide; involucres (7–)8–11(–12) mm diam.; pappus scales aristate; Kansas, New Mexico, Oklahoma, Texas, on limestone-derived soils Tetraneuris linearifolia var. linearifolia
1 Stems erect or ± decumbent, ± branched distally; leaves usually densely hairy, basal blades with 2–6 teeth or lobes, proximal cauline blades with 2(–6) teeth or lobes, mid blades (2.5–)3.9–9.5(–16) mm wide; involucres 12–15 mm diam.; pappus scales not aristate; s Texas on sand Tetraneuris linearifolia var. arenicola
... more about "Tetraneuris linearifolia"
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 +
(Hooker) Greene +
with 2-6 teeth or lobes +  and entire +
spatulate +  and oblanceolate +
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 +
Kans. +, N.Mex. +, Okla. +, Tex. +  and n Mexico +
more or less +  and eglandular +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
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 />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hemispheric;campanulate +
0.7 cm7 mm <br />0.007 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;linear-oblanceolate +
0.9mm;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 +
8 cm80 mm <br />0.08 m <br /> (29 cm290 mm <br />0.29 m <br />) +
11 +  and 60 +
with 2-6 teeth or lobes +  and entire +
oblanceolate +  and linear-oblanceolate +
bearing subulate enations +, hairy +  and bristly +
hemispheric;conic +
4 +  and 8 +
aristate +  and obovate +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
exalbuminous +
branched +, unbranched +  and leafy +
decumbent +  and erect +
1 +  and 10 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Tetraneuris linearifolia +
Tetraneuris +
species +
urceolate +  and campanulate +
dilated +
16 cm160 mm <br />0.16 m <br /> (50 cm500 mm <br />0.5 m <br />) +
shrub +  and subshrub +