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 gland-dotted. 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; pappus-like 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"
John L. Strother +
(M. E. Jones) Barneby +
Parthenium alpinum var. ligulatum +
Colo. +  and Utah. +
1800–2000 m +
Pale shale or sandstone outcrops with pinyon-juniper +
Flowering May–Jun. +
Leafl. W. Bot. +
Undefined (tribe Undefined) subtribe Ambrosieae +  and Undefined (tribe Undefined) subtribe Iveae +
Parthenium ligulatum +
Parthenium +
species +