Trixis inula

Crantz

Inst. Rei Herb. 1: 329. 1766.

Common names: Mexican trixis hierba del aire tropical threefold
Treatment appears in FNA Volume 19. Treatment on page 75. Mentioned on page 76.

Plants 30–300+ cm (much branched). Leaves usually spreading; petioles 1–3 mm; blades linear-lanceolate to lanceolate or elliptic, 2.5–16.5 cm, bases attenuate to ± truncate, margins entire or denticulate (± flat), induments: margins and sometimes abaxial midveins with glandless and glandular-hairs, otherwise glabrous; stomates on abaxial faces. Heads in corymbiform or paniculiform arrays. Peduncles 1–20 (–25) mm, little, if at all, inflated distally. Calyculi of 3–5 linear to lanceolate (rarely ovate) bractlets 2.5–17 mm. Phyllaries usually 8, linear to oblong, 8–13 (–15) mm, apices acute. Florets (8–) 10–15; corolla-tubes 5–9 mm, outer lips 4–7.5 mm, inner 3.5–5.5 mm. Cypselae 4.5–9 mm, papillalike double hairs not producing mucilage when wetted; pappi 7–11 mm. 2n = 54.


Phenology: Flowering Mar–Nov (following rains).
Habitat: Open, sandy sites, thorn scrub, palm groves, thickets, roadsides
Elevation: 0–100 m

Distribution

V19-14-distribution-map.gif

Tex., Mexico, West Indies, Central America, n South America

Discussion

The earliest botanical name for the plants here called Trixis inula is Inula trixis Linnaeus, 1760. In 1763, Linnaeus changed the name from Inula trixis to Perdicium radiale, which was based on the same type and is illegitimate under today’s rules of botanical nomenclature because the epithet trixis should have been used in 1763. The name Trixis radialis (Linnaeus) Kuntze, 1891, was based on Perdicium radiale of Linnaeus and has been used by some botanists; it is superfluous and illegitimate under today’s rules.

Selected References

None.

Lower Taxa

None.
... more about "Trixis inula"
scarious +
acute +  and oblong +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
David J. Keil +
Crantz +
attenuate to more +
compound +  and simple +
linear-lanceolate;lanceolate or elliptic +
2.5 cm25 mm <br />0.025 m <br /> (16.5 cm165 mm <br />0.165 m <br />) +
ribbed;smooth +
linear;lanceolate +
0.25 cm2.5 mm <br />0.0025 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
barbellulate +  and smooth +
Mexican trixis +, hierba del aire +  and tropical threefold +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
papilla-like +
Tex. +, Mexico +, West Indies +, Central America +  and n South America +
0–100 m +
glandular-hairy +  and strigose +
pistillate +, staminate +  and neuter +
fertile +  and bisexual +
winged +  and beaked +
dispersed +
Open, sandy sites, thorn scrub, palm groves, thickets, roadsides +
in corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
petiolate +  and sessile +
entire +  and dentate +
denticulate +  and entire +
0.4 cm4 mm <br />0.004 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
2-carpellate +
persistent +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Mar–Nov (following rains). +
1.3 cm13 mm <br />0.013 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
connate +  and distinct +
unequal +  and subequal +
0.8 cm8 mm <br />0.008 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
Inst. Rei Herb. +
flat;convex +
barbellulate +  and smooth +
plumose +, subulate +  and setiform +
exalbuminous +
prostrate +  and ascending +
appendaged +  and truncate +
hairy +  and glabrous +
papillate +
Compositae +
Trixis inula +
species +
perennial +  and annual +