Packera dimorphophylla

(Greene) W. A. Weber & Á. Löve
Phytologia 49: 46. 1981.
IllustratedEndemic
Basionym: Senecio dimorphophyllus Greene Pittonia 4: 109. 1900
Treatment appears in FNA Volume 20. Treatment on page 584. Mentioned on page 571, 583.

Perennials, 10–30+ cm; fibrous-rooted (caudices horizontal to erect, relatively short and stout). Stems usually 1, rarely 2–3, clustered, glabrous. Basal leaves (relatively thick and turgid) petiolate (petioles broad-winged or narrow, delicate); blades ovate, ovate-orbiculate, oblong-lanceolate, orbiculate, suborbiculate, reniform, or subreniform, 10–50+ × 10–40 mm, bases tapering or subcordate to abruptly contracted, margins entire or crenate. Cauline leaves gradually reduced (proximal and mid sometimes as large as or larger than basal, sessile, oblanceolate to obovate, sometimes lyrate, sometimes auriculate and/or clasping, subentire to irregularly dissected; distal usually sessile, bractlike, sometimes larger). Heads 1–6+ in congested, corymbiform or subumbelliform arrays. Peduncles inconspicuously bracteate or ebracteate, glabrous. Calyculi conspicuous (bases of bractlets swollen). Phyllaries (8–)13 or 21, green (tips cyanic), 5–7+ mm, glabrous. Ray florets 8 or 13; corolla laminae (deep yellow to orange) 5–8+ mm. Disc florets 45–60+; corolla tubes 2–3 mm, limbs 2.5–3.5 mm. Cypselae 0.75–1.5 mm, glabrous, pappi 3–4 mm. 2n = 46.

Distribution

V20-1300-distribution-map.gif

Colo., Idaho, Mont., N.Mex., Nev., Utah, Wyo.

Discussion

Varieties 3 (3 in the flora).

Selected References

None.

Key

1 Basal leaves: petioles broad-winged, blades ovate to oblong-lanceolate, bases tapering; stems usually not branched Packera dimorphophylla var. dimorphophylla
1 Basal leaves: petioles narrowly, if at all winged, blades suborbiculate, orbiculate, ovate-orbiculate, subreniform, or reniform, bases subcordate to abruptly contracted; stems branched or not branched > 2
2 Plants 30–50 cm; stems not branched; petiole lengths 1–3 times blades; Utah Packera dimorphophylla var. intermedia
2 Plants 10–35 cm; stems frequently 1–3 times branched; petiole lengths 1–2 times blades; Idaho, Montana, Nevada, Wyoming Packera dimorphophylla var. paysonii