Parthenium ligulatum

(M. E. Jones) Barneby

Leafl. W. Bot. 5: 20. 1947.

Endemic
Basionym: Parthenium alpinum var. ligulatum M. E. Jones Contr. W. Bot. 13: 16. 1910
Treatment appears in FNA Volume 21. Treatment on page 21. Mentioned on page 20.

Perennials, 1–2 cm (underground caudices 2–5+ cm, branched; plants cespitose or forming mats). Leaf-blades oblanceolate to spatulate, 5–18+ × 1–2 (–4+) mm, margins entire, faces strigilloso-sericeous (gray) and obscurely glanddotted. Heads radiate, borne singly. Peduncles 0–4 mm. Phyllaries: outer 5 ± ovate, 2.5–3 mm, inner 5 ± orbiculate, 3–4+ mm. Pistillate florets 5; corolla laminae oval to elliptic, 1–2 mm, retuse. Disc-florets 15–25+. Cypselae oblanceoloid to pyriform, 3.5–4 mm; pappuslike enations 2, erect to spreading, ± subulate, 0.5–1 mm (a third, ± subulate element sometimes at apex of adaxial face). 2n = 36, 72.


Phenology: Flowering May–Jun.
Habitat: Pale shale or sandstone outcrops with pinyon-juniper
Elevation: 1800–2000 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Parthenium ligulatum"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
John L. Strother +
(M. E. Jones) Barneby +
decurrent +
Parthenium alpinum var. ligulatum +
compound +  and simple +
lobed;spatulate;rounded-deltate;ovate;obovate;oblanceolate;lyrate;lanceolate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
ochroleucous +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
villous +, strigillose +, hispidulous +, glabrous +  and warty +
scabrellous +  and tuberculate +
oblanceoloid +  and pyriform +
fertile +  and bisexual +
Colo. +  and Utah. +
1800–2000 m +
subulate +  and pappuslike +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
strigilloso-sericeous +
winged +  and beaked +
dispersed +
Pale shale or sandstone outcrops with pinyon-juniper +
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 />) +
less scarious +  and membranous +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
hemispheric +
conspicuous +
oblong +  and reniform or orbiculate or more or less coroniform +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
sessile +  and petiolate +
deltate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
herbaceous +  and scarious +
2-carpellate +
peripheral +
papillate +
fimbrillate;cuneate;flabelliform +
membranous +  and scarious +
persistent +
0 cm0 mm <br />0 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering May–Jun. +
unequal +  and subequal +
Leafl. W. Bot. +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Ambrosieae +  and Undefined (tribe Undefined) subtribe Iveae +
Parthenium ligulatum +
Parthenium +
species +
campanulate +  and cylindric +
toothed +  and entire +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
shrub +  and subshrub +