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Parthenium alpinum
(Nutt.) Torr. & Gray
Family:
Asteraceae
Alpine Feverfew
[
Bolophyta alpina
Nutt.,
more
Parthenium alpinum var. alpinum
]
FNA
Resources
John L. Strother in Flora of North America (vol. 21)
Perennials,
1-2 cm (underground caudices 2-5+ cm, branched; plants cespitose or forming mats).
Leaf blades
oblanceolate to spatulate, 6-18(-35) × 1-3(-4+) mm, margins entire, faces strigilloso-sericeous (gray) and obscurely gland-dotted.
Heads
± disciform, borne singly.
Peduncles
0-5(-30) mm.
Phyllaries:
outer 5-8 ± linear, 4 mm, inner 5-8 ± orbiculate, 4-5 mm.
Pistillate florets
5-8; corolla laminae 0 (tubes ± compressed, obscurely 2-4-lobed).
Disc florets
18-28+.
Cypselae
oblanceoloid, 4 mm (narrowly winged); pappus-like enations 2, erect to spreading, ± subulate, 0.5-1 mm (a third, ± subulate element sometimes at apex of adaxial face).
2
n
= 36.
Flowering May-Jul. Shale and calcareous outcrops, red clays; 1300-1700 m; Colo., N.Mex., Wyo.
Parthenium alpinum
is in the Center for Plant Conservation´s National Collection of Endangered Plants.
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