Difference between revisions of "Parthenium ligulatum"
Leafl. W. Bot. 5: 20. 1947.
Basionym: Parthenium alpinum var. ligulatum M. E. Jones Contr. W. Bot. 13: 16. 1910
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Revision as of 18:48, 24 September 2019
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.